Bibliografías temáticas / Applications en catalyse

Índice

Artículos de revistas
Tesis
Libros
Capítulos de libros
Actas de conferencias
Informes

Literatura académica sobre el tema "Applications en catalyse"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 9 de febrero de 2022

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros

Elija tipo de fuente:

Consulte las listas temáticas de artículos, libros, tesis, actas de conferencias y otras fuentes académicas sobre el tema "Applications en catalyse".

Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.

También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.

Artículos de revistas sobre el tema "Applications en catalyse"

Boudart, Michel. "La catalyse et ses applications". Bulletin de la Classe des sciences 73, n.º 1 (1987): 303–8. http://dx.doi.org/10.3406/barb.1987.57688.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Robinson, Peter K. "Enzymes: principles and biotechnological applications". Essays in Biochemistry 59 (26 de octubre de 2015): 1–41. http://dx.doi.org/10.1042/bse0590001.

Texto completo

Resumen

Enzymes are biological catalysts (also known as biocatalysts) that speed up biochemical reactions in living organisms, and which can be extracted from cells and then used to catalyse a wide range of commercially important processes. This chapter covers the basic principles of enzymology, such as classification, structure, kinetics and inhibition, and also provides an overview of industrial applications. In addition, techniques for the purification of enzymes are discussed.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Mutti, Francesco G. "Alkene Cleavage Catalysed by Heme and Nonheme Enzymes: Reaction Mechanisms and Biocatalytic Applications". Bioinorganic Chemistry and Applications 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/626909.

Texto completo

Resumen

The oxidative cleavage of alkenes is classically performed by chemical methods, although they display several drawbacks. Ozonolysis requires harsh conditions (−78°C, for a safe process) and reducing reagents in a molar amount, whereas the use of poisonous heavy metals such as Cr, Os, or Ru as catalysts is additionally plagued by low yield and selectivity. Conversely, heme and nonheme enzymes can catalyse the oxidative alkene cleavage at ambient temperature and atmospheric pressure in an aqueous buffer, showing excellent chemo- and regioselectivities in certain cases. This paper focuses on the alkene cleavage catalysed by iron cofactor-dependent enzymes encompassing the reaction mechanisms (in case where it is known) and the application of these enzymes in biocatalysis.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Lucas, Amand A. "Le confinement physique en catalyse hétérogène et autres applications". Bulletin de la Classe des sciences 19, n.º 1 (2008): 219–28. http://dx.doi.org/10.3406/barb.2008.28667.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Choi, Won Joon, Sungkyu Choi, Kei Ohkubo, Shunichi Fukuzumi, Eun Jin Cho y Youngmin You. "Mechanisms and applications of cyclometalated Pt(ii) complexes in photoredox catalytic trifluoromethylation". Chemical Science 6, n.º 2 (2015): 1454–64. http://dx.doi.org/10.1039/c4sc02537g.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Fürstner, Alois. "Quelques commentaires sur la catalyse : la recherche fondamentale précède les applications". Comptes Rendus Chimie 17, n.º 11 (noviembre de 2014): 1065–70. http://dx.doi.org/10.1016/j.crci.2014.06.003.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Folcher, G. "Composés organométalliques des actinides: synthèses et applications à la catalyse homogène". Journal of the Less Common Metals 122 (agosto de 1986): 139–51. http://dx.doi.org/10.1016/0022-5088(86)90402-9.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Li, He, Xiao Feng, Pengpeng Shao, Jian Chen, Chunzhi Li, Sanjeevi Jayakumar y Qihua Yang. "Synthesis of covalent organic frameworks via in situ salen skeleton formation for catalytic applications". Journal of Materials Chemistry A 7, n.º 10 (2019): 5482–92. http://dx.doi.org/10.1039/c8ta11058a.

Texto completo

Resumen

A facile synthesis of COF-salen via in situ salen skeleton formation under air atmosphere is described herein. COF-salen–M prepared via metal ion coordination could efficiently catalyse chemical reactions, e.g. styrene epoxidation, epoxide hydration and cycloaddition reactions of epoxides with CO₂. More interestingly, both cooperation and isolation effects were observed in COF-salen–M.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Kumar, Satyendra, Fariha Saleem, Manish Kumar Mishra y Ajai K. Singh. "Oxine based unsymmetrical (O−, N, S/Se) pincer ligands and their palladium(ii) complexes: synthesis, structural aspects and applications as a catalyst in amine and copper-free Sonogashira coupling". New Journal of Chemistry 41, n.º 7 (2017): 2745–55. http://dx.doi.org/10.1039/c7nj00067g.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Mann, Greg y Frédéric V. Stanger. "A Bio-logical Approach to Catalysis in the Pharmaceutical Industry". CHIMIA International Journal for Chemistry 74, n.º 5 (27 de mayo de 2020): 407–17. http://dx.doi.org/10.2533/chimia.2020.407.

Texto completo

Resumen

Enzymes have the potential to catalyse complex chemical reactions with unprecedented selectivity, under mild conditions in aqueous media. Accordingly, there is serious interest from the pharmaceutical industry to utilize enzymes as biocatalysts to produce medicines in an environmentally sustainable and economic manner. Prominent advances in the field of biotechnology have transformed this potential into a reality. Using modern protein engineering techniques, in a matter of months it is possible to evolve an enzyme, which fits the demands of a chemical process, or even to catalyse entirely novel chemistry. Consequently, biocatalysis is routinely applied throughout the pharmaceutical industry for a variety of applications, ranging from the manufacture of large volumes of high value blockbuster drugs to expanding the chemical space available for drug discovery.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Más fuentes

Tesis sobre el tema "Applications en catalyse"

Chenneberg, Ludwig. "Nouvelles avancées en catalyse photoredox : applications en chimie radicalaire de synthèse et en catalyse duale". Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066305/document.

Texto completo

Resumen

L’objectif principal des travaux de recherche décrits dans ce manuscrit de thèse, est de concevoir de nouvelles méthodes de synthèse en chimie radicalaire et organométallique, de les associer dans une catalyse duale afin qu’elles puissent être appliquées à l’élaboration de briques moléculaires élaborées. Nous avons développé dans une première étude une alternative photocatalytique à la réaction de désoxygénation classique de Barton-McCombie d’alcools secondaires et tertiaires par l’hydrure de tributylétain. Celle-ci repose sur l’utilisation d’un précurseur O-thiocarbamate dérivé d’alcools pouvant être réduit par catalyse photorédox. Une étude mécanistique, basée sur des expériences de fluorescence et de voltammétrie cyclique, est aussi présentée. Dans une seconde étude, une élégante méthode de génération de radicaux alkyles non stabilisés, par photooxydation de « ate-complexes » de bore ou d’espèces hypervalentes à base de silicium est présentée. Ces radicaux sont piégés en présence d’accepteurs radicalaires ou engagés dans une catalyse duale avec des complexes de Nickel
Visible-light photoredox catalysis has emerged as a very powerful strategy to generate radical species replacing more and more tin-mediated or stoichiometric redox methodologies. The main objective of the research described in this Ph. D. thesis is to develop new synthetic methodologies in radical and organometallic chemistry, and merge them in a dual catalysis process for the preparation of elaborated molecular building blocks. In a first study, we report a photocatalytic alternative of Barton-McCombie deoxygenation based on a visible-light photoreduction of O-thiocarbamates derived from secondary and tertiary alcohols. A mechanistic investigation is presented based on fluorescence quenching and cyclic voltammetry experiments. In a second study, a challenging method of generation of unstabilized alkyl radicals by photooxidation of borate salts or hypervalent silicon species is reported. These radicals are trapped by free radical scavengers or engaged in a photoredox/nickel dual catalysis

Los estilos APA, Harvard, Vancouver, ISO, etc.

Putaj, Piotr. "Applications des polyoxométalates en catalyse hétérogène". Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00869429.

Texto completo

Resumen

L'objectif de la thèse était la préparation et la caractérisation des catalyseurs hétérogènes à base de polyoxométalates. L'étude mécanistique d'oxydation du méthane jusqu'au méthanol a montré que sur des polyoxométalates supportés sur la silice l'activation C-H a lieu déjà à la température ambiante. L'adsorption du méthane-13C sur H4SiMo12O40 supporté, suivie par RMN solide a mis en évidence la création de l'espèce méthoxy [SiMo12O40(CH3)]3-. Le cycle catalytique est complété par l'hydrolyse de cette espèce - méthanol est formé et une molécule de l'eau recrée la structure du départ de polyoxométalate. L'adsorption du méthanol-13C sur des polyoxométalates a montré la création de deux types des espèces methoxy, localisées sur des atomes d'oxygènes terminaux ou pontants est caractérisées par deux signaux RMN distincts - à 58 et 77 ppm, respectivement. En greffant un complexe de platine PtMe2COD sur les sels de césium de polyoxometalates, le dégagement du méthane ou de la mélange du méthane et de l'éthane a été observé et expliqué par la séquence de l'addition oxydative du proton de polyoxometalate au centre métallique, couplage C-H ou C-C et finalement l'élimination réductrice et libération d'une molécule de gaz. Sels d'ammonium de l'acide phosphotungstique H3PW12O40 ont été montrées de catalyser l'isomérisation du n-butane a l'isobutane dans des conditions douces (225°C, 1 atm.). Composé du cuivre Cu(OTf)2 sur la surface des sels inorganiques des polyoxometalates donne des catalyseurs très actifs en insertion des carbènes aux liaisons C-H des éthers cycliques.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Brenet, Simon. "Nouvelle structure BINOL-Maléimide. Applications en catalyse d'oxydation asymétrique". Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENV050/document.

Texto completo

Resumen

Les réactions asymétriques catalysées constituent une approche élégante au problème de l'introduction de centres stéréogène pour la synthèse de molécules complexes. Dans ce contexte, les oxydations sont notables de par la possibilité de créer en une seule étape à la fois le centre asymétrique ainsi que les fonctions dont les réactivités sont à la base des méthodologies de synthèse. La sélectivité d'un catalyseur est le plus souvent contrôlée par sa structure même. Notre groupe étudie les oxydations aérobies asymétriques par activation C-H par des analogues chiraux du N-hydroxyphtalimide (NHPI). Nous avons développé une nouvelle structure de catalyseur comportant un cœur BINOL-maléimide afin de dépasser les limitations intrinsèque des précédentes générations de catalyseurs. La première série n'a pas montré d'énantiosélectivité, cela nous a conduit a synthétiser une deuxième série dont les caractéristiques permettraient d'améliorer l'efficacité de ces catalyseurs d'oxydation aérobie asymétrique. Le développement d'un analogue portant deux iodes nous a conduit à étudier cette structure en tant que cœur de catalyseurs à base d'iode hypervalent. Nous avons analysé trois séries de ces catalyseurs pour l'oxytosylation de cétones prochirales et montré que notre structure est comparable avec celles présentées dans la littérature
Catalysed asymmetric reactions are an elegant approach towards the synthesis of complex molecules for the controlled introduction of stereocenters. Within this field, oxidations are noteworthy since they allow to create in one step both the stereogenic elements and the moieties whose reactivities are the cornerstone of the methodologies of synthesis. The selectivity of a catalyst is most often controlled by its own structure. Our group has investigated catalysed asymmetric aerobic oxidations by C-H activation through the use of chiral analogues of N-hydroxyphtalimide (NHPI). We have developed a new structure of catalyst based upon a BINOL-fused maleimide core to circumvent the inherent limitations of previous catalysts generations. The first series showed no enantioselectivity and led us to synthesize a second series whose features are expected to improve the overall efficiency of those catalysts for asymmetric aerobic oxidations. The development of an analogue bearing two iodine moieties prompted us to study this structure as a core for chiral hypervalent organo-iodine(lll) catalysts. We have investigated three series of such catalysts for the asymmetric α-oxytosylation of prochiral ketones and showed that our structure is comparable with the ones found in the literature

Los estilos APA, Harvard, Vancouver, ISO, etc.

Wu, Zhiyong. "Synthèse de nouveaux catalyseurs chiraux d’or(I) et applications en catalyse énantiosélective". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS244.

Texto completo

Resumen

Les réactions de cycloisomérisation sont des outils puissant pour la synthèse d’hétérocycles et de carbocycles, tant sous leur forme racémique qu’énantioenrichie. La cyclisation directe de substrats énynes, afin de former des nouvelles liaisons carbone-carbone ou carbone-hétéroatome s’est révélée être une approche efficace, tant en économie d’atomes qu’en nombres d’étapes de synthèse, pour l’obtention de composés bicycliques ou tricycliques. Les réactions de cyclisation des substrats énynes-1,5 et 1,6 sont certainement les exemples les plus marquants. Dans notre équipe de recherche, depuis quelques années, nous avons developpé avec succés des nouveaux catalyseurs chiraux d’or(I) et de platine. Ces derniers nous ont permis d’obtenir dans les reactions de cyclisation d’énynes les produits correspondants avec de très bons rendements et énantiosélectivités. Cependant à notre connaissance, et jusqu’à present, les meilleurs catalyseurs d’or(I) chiraux possédaient soit une chiralité axiale, centrale ou hélicoïdale. En effet, concernant les complexes d’or(I) possédant une chiralité planaire, à part quelques résultats préliminaires modestes, cette source de chiralité a plutôt été négligée jusqu’à présent.Afin de combler ce vide, nous proposons dans cette thèse le développement de deux nouvelles familles de catalyseurs à chiralité planaire, et de les appliquer dans des réactions de cycloisomérisation d’énynes. Dans la dernière partie de cette thèse, nous avons développé une nouvelle réaction énantiosélective pour la formation de composés polycycliques.Cette thèse regroupe l’ensemble de ces résultats en cinq chapitres distincts : i) Une introduction générale sur la catalyse à l’or et sur les différentes réactions et applications envisageables. ii) La préparation d’une nouvelles famille de ligands phosphorés ferrocéniques possédant une chiralité planaire, et des complexes d’or(I) correspondants. Ces complexes se sont révélés être particulièrement actifs dans la formation de bicyclo[3.1.0]hexanones par cycloisomérisation d’énynes 1,5. iii) Dans le troisième chapitre sera détaillé mon travail concernant le développement d’une nouvelle famille de phosphoramidites à chiralité planaire. Les complexes d’or correspondant se sont révélé être très actifs dans des réactions de cyclotrimérisation de diénynes 1,6 azotés. Les produits correspondants ont été obtenus avec de bons rendements, diastéréosélectivités et énantiosélectivités (jusqu’à 95% ee). iv) Enfin, nous avons mis au point une nouvelle réaction énantiosélective de formation de dérivés polycycliques, en utilisant tous les catalyseurs d’or préalablement synthétisés, ainsi que ceux décrits dans la littérature. De nombreux substrats cyclopropylénynes diversement substitués ont pu donner accès aux produits correspondants avec de très bons rendements et énantiosélectivités (jusqu’à 99% ee). La post-fonctionnalisation des produits ainsi obtenus a permis l’obtention de produits analogues de composés naturels complexes. v) Après la conclusion et les perspectives à ce travail, une partie expérimentale regroupant les modes opératoires et toutes les analyses physico-chimiques des produits synthétisés est présentée
The gold(I)-catalyzed cycloisomerization reactions provide powerful tools for the synthesis of heterocycles and carbocycles in both racemic and enantiomerically enriched forms. The direct cyclization of enyne substrates to form new C-C or C-heteroatom bonds proved to be an efficient atom and step economy approach for the synthesis of bicyclic or tricyclic compounds. The well-known cyclizations of 1,6- and 1,5-enynes into bicyclic compounds are one of the most powerful examples. Moreover, during the last few years, our group developed several series of chiral platinum or gold pre-catalysts which exhibit excellent catalytic activity, diastereoselectivity and enantioselectivity in the cyclization of enyne substrates.As far as we know, gold complexes with central, axial and helical chirality exhibited excellent results both in terms of catalytic activity and enantioselectivity. However, the planar chirality has been rather neglected so far in the gold promoted enantioselective cyclizations. Although some planar chiral gold complexes (mainly based on the ferrocene structure) have been reported in recent years, high enantioselectivity proved particularly difficult to obtain. In order to extend the potential applications of the planar chiral gold complexes, we have synthesized two new family of gold complexes with planar chirality and applied them in the cycloisomerization of 1,5-enynes and 1,6-dienynes. Finally, with several families of chiral gold complexes (with axial, planar or helical chirality) in hand, we developed a new type of cycloaddition reaction, with excellent catalytic activity and enantioselectivity.This thesis summarizes these studies: i) The chiral monodentate phosphines based on ortho-disubstituted ferrocene units have been prepared and used for the synthesis of gold(I) complexes. These complexes proved to be very active catalysts for the cycloisomerization of 3-hydroxy-1,5-enynes into bicyclo[3.1.0]hexanones. Their high catalytic activity is ascribed to their structural analogy to the biaryl-based Buchwald phosphines. ii) We have also synthesized and characterized new chiral phosphoramidites and demonstrated for the first time the ability of planar-chiral gold(I) complexes to obtain high enantioselectivities in cycloisomerisation reactions. Furthermore, starting from N-tethered prochiral dienynes, the corresponding bicyclo[4.1.0]heptane derivatives, containing three contiguous stereocenters, were obtained in good yields, with a total diastereoselectivity and up to 95% ee. iii) With a number of chiral gold complexes (with axial, planar or helical chirality), an efficient approach for the cycloaddition of cyclopropylenynes has been developed, based on the enantioselective gold catalyzed cycloaddition reaction. This novel method provides an easy access to the enantioselective synthesis of cyclobutanones and the further preparation of chiral tricyclic compounds possessing the skeleton of natural products. We have highlighted axial bis(phosphine)digold(I) complexes which afforded the cyclobutanones with up to 99% enantiomeric excesses in these cyclization reactions

Los estilos APA, Harvard, Vancouver, ISO, etc.

Abdulaeva, Inna. "Imidazoporphyrines fonctionnalisées et leurs applications en catalyse". Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK053/document.

Texto completo

Resumen

Une large série d’imidazo[4,5-b]porphyrines a été synthétisée par condensation acido catalysée du 2,3-dioxo-5,10,15,20-tétraarylchlorines avec des aldéhydes aromatiques. Les propriétés stériques et électroniques des substituants méso-aryle sur le macrocycle tétrapyrrolique ont une influence importante sur le rendement en produit qui peut varier de 18% à 90%. L'analyse par diffraction des rayons X de la structure cristalline du 5,10,15,20-tétramésityl-2-(4-pyridyl)-1H-imidazo[4,5-b]porphyrinate de zinc(II) a montré qu'à l'état solide ce complexe forme des polymères de coordination. Ensuite, différentes méthodes de greffage des imidazoporphyrines sur la surface de TiO2 et ZrO2 mésoporeux ont été étudiées pour évaluer l'intérêt de ces matériaux hybrides en catalyse. La photo-oxydation en milieu homogène des sulfures en sulfoxydes par l'oxygène de l'air en présence de 5,10,15,20-tétramésityl-2-(4-diéthoxyphosphorylphényl)-1H-imidazo[4,5-b]porphyrinate d'indium(III) a été mis en œuvre. Il a été ainsi montré que le complexe supporté par le TiO2 pouvait être recyclé plusieurs fois malgré un lessivage partiel (1%) du catalyseur en solution. Puis, le 5,10,15,20-tétramésityl-2-(4-diéthoxyphosphorylphényl)-1H-imidazo[4,5-b]porphyrinate de manganèse(III) supportée par TiO2 a été utilisé comme catalyseur pour l'oxydation de sulfures en sulfoxydes par l'oxygène moléculaire en présence d'isobutyraldéhyde. Une large série de sulfoxydes a été préparée avec des rendements élevés (> 89%). Le catalyseur a été recyclé 7 fois sans perte de son efficacité et de sa sélectivité. Dans les conditions mises en jeu le lessivage du catalyseur en solution n'a pas été observé
A broad series of functionalized imidazo[4,5-b]porphyrins was synthesized by the acid-catalyzed condensation of 2,3-dioxo-5,10,15,20-tetraarylchlorins with aromatic aldehydes. Both steric and electronic features of meso-aryl substituents influence on the product yield ranging from 18% to 90%.Single-crystal X-ray diffraction analysis of the structure of zinc(II) 5,10,15,20-tetramesityl-2-(4-pyridyl)-1H-imidazo[4,5-b]porphyrinate showed that this compound forms 1D coordination chains in the solid state.The post-synthetic modifications of imidazo[4,5-b]porphyrins were investigated by performing the Suzuki-Miyaura coupling reaction, preparing water-soluble imidazoporphyrins and linear/angular bis(imidazo)porphyrins.Several methods of grafting of imidazoporphyrins on the surface of mesoporous TiO2 and ZrO2 were investigated to prepare hybrid materials for catalysis.Then, it was demonstrated that indium(III) 5,10,15,20-tetramesityl-2-(4-diethoxyphospho-rylphenyl)-1H-imidazo[4,5-b]porphyrinate catalyzes the photooxidation of sulfides to sulfoxides by oxygen from air. This complex grafted on TiO2 surface was efficient as a reusable catalyst in spite of partial (1%) leaching of imidazoporphyrin in solution. TiO2-supported manganese(III) 5,10,15,20-tetramesityl-2-(4-diethoxyphosphoryl-phenyl)-1H-imidazo[4,5-b]porphyrinate was employed for catalytic oxidation of a broad range of sulfides by pure oxygen in the presence of isobutyraldehyde. All sulfoxides were obtained in high yields (>89%). The catalyst was reused in 7 consecutive cycles without loss of its efficiency and selectivity. Leaching of the catalyst was not observed under studied conditions

Los estilos APA, Harvard, Vancouver, ISO, etc.

Putaj, Piotr. "Applications of polyoxometalates in heterogenous catalysis". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10038/document.

Texto completo

Resumen

L’objectif de la thèse était la préparation et la caractérisation des catalyseurs hétérogènes à base de polyoxométalates. L’étude mécanistique d’oxydation du méthane jusqu’au méthanol a montré que sur des polyoxométalates supportés sur la silice l’activation C-H a lieu déjà à la température ambiante. L’adsorption du méthane-13C sur H4SiMo12O40 supporté, suivie par RMN solide a mis en évidence la création de l’espèce méthoxy [SiMo12O40(CH3)]3-. Le cycle catalytique est complété par l’hydrolyse de cette espèce - méthanol est formé et une molécule de l’eau recrée la structure du départ de polyoxométalate. L’adsorption du méthanol-13C sur des polyoxométalates a montré la création de deux types des espèces methoxy, localisées sur des atomes d’oxygènes terminaux ou pontants est caractérisées par deux signaux RMN distincts – à 58 et 77 ppm, respectivement. En greffant un complexe de platine PtMe2COD sur les sels de césium de polyoxometalates, le dégagement du méthane ou de la mélange du méthane et de l’éthane a été observé et expliqué par la séquence de l’addition oxydative du proton de polyoxometalate au centre métallique, couplage C-H ou C-C et finalement l’élimination réductrice et libération d’une molécule de gaz. Sels d’ammonium de l’acide phosphotungstique H3PW12O40 ont été montrées de catalyser l’isomérisation du n-butane a l’isobutane dans des conditions douces (225°C, 1 atm.). Composé du cuivre Cu(OTf)2 sur la surface des sels inorganiques des polyoxometalates donne des catalyseurs très actifs en insertion des carbènes aux liaisons C-H des éthers cycliques
The aim of this work was preparation and characterization of catalysts based on polyoxometalates and their use in various catalytic reactions in heterogenous conditions. Methane C-H activation on silica-supported polyoxometalates was shown already at room temperature. Methoxy species [SiMo12O40(CH3)]3- from the 13C-enriched methane adsorption at 200°C on the surface of a silicadispersed silicomolybdic acid was detected by means of 13C SS NMR. Its hydrolysis led to methanol formation, thus completing the catalytic cycle. After 13C-enriched MeOH adsorption presence of two distinct methoxy species on the surface of polyoxometalates was shown, located on terminal (single coordinated) and bridging (double coordinated) oxygen atoms and resulting in the resonances at 58 and 77 ppm in 13C SS NMR. Grafting of PtMe2COD on the surface of various polyoxometalate supports led to methane or combined methane and ethane release, explained by means of oxidative addition/reductive elimination mechanism on metal centers. Ammonium salts of phosphotungstic acid catalyzed efficiently n-butane to isobutane skeletal isomerisation at mild conditions (225 °C, atmospheric pressure). Successful heterogenization of copper catalysts, active in enantioselective C-H carbene insertion reactions, on polyoxometalate supports have been shown

Los estilos APA, Harvard, Vancouver, ISO, etc.

Ma, Xiaolu. "Bis (trialkoxysilyl) telechelic polymer materials for adhesive applications". Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S123.

Texto completo

Resumen

Les travaux portent sur la synthèse des (co)polyoléfines bis(trialcoxysilyle) téléchéliques, liquides à température ambiante, pour des applications adhésives. La première approche est consacrée à la combinaison de la polymérisation par ouverture de cycle par métathèse (ROMP) et de la métathèse croisée (CM) d'une cyclooléfine ou d'un mélange de cyclooléfines en présence d'une oléfine trialcoxysilyle monofonctionnelle ou difonctionnelle agissant comme agent de transfert (CTA) et d'un catalyseur à base de ruthénium. Il est montré que l'efficacité de la réaction et la sélectivité / fonctionnalité des polymères dépendent notamment de la nature du solvant, du CTA, du catalyseur, et de l'utilisation (ou pas) de benzoquinone comme additif inhibiteur de l'isomérisation. Une très grande productivité catalytique (turnover number, TON, jusque 100 000) a été obtenue avec les conditions optimisées. La viscosité du copolymère a été contrôlée par ajustement de la nature et du ratio des co-monomères. La deuxième approche est consacrée à la dépolymérisation du polybutadiène (PBD) liquide à haute teneur en 1,4-cis en présence d'un CTA et d'un catalyseur au ruthénium. L'efficacité et la sélectivité de la réaction ont été optimisées en variant la méthode de la purification du PBD commercial, la nature du catalyseur et le protocole opératoire. Cette approche est néanmoins moins efficace que la première
The work presented focuses on the synthesis of liquid (at room temperature) bis(trialkoxysilyl) telechelic polyolefins for adhesive applications. The first approach relies on the combined ring-opening metathesis polymerization/cross metathesis (ROMP/CM) of a cycloolefin or a mixture of cycloolefins using a trialkoxysilyl mono- or difunctionalized alkene acting as a chain transfer agent (CTA) and a ruthenium-based catalyst. The efficiency of the reaction and selectivity of the polymer functionality were found to depend much on the nature of the CTA, the catalyst, the solvent and the use of benzoquinone additive as isomerization inhibitor. A high catalytic productivity with a turnover number (TON) up to 100 000 was obtained under optimized conditions. The viscosity of polymers was controlled by adjusting the nature and the ratio of comonomers. The second approach is dedicated to the depolymerization of liquid high 1,4-cis polybutadiene (PBD) in the presence of a CTA and a ruthenium catalyst. The catalytic productivity and selectivity were optimized by changing the method of purification of the commercial PBD, the nature of catalyst and the reaction protocol. This second approach remains, however, less efficient than the first one

Los estilos APA, Harvard, Vancouver, ISO, etc.

Reymond, Sébastien. "Phosphonamides chiraux : synthèse et applications en catalyse énanthiosélective". Aix-Marseille 3, 2003. http://www.theses.fr/2003AIX30005.

Texto completo

Resumen

Une variété de nouveaux diazaphosphonamides mono- et bifonctionnels chiraux a été préparée par synthèse diastéréosélective impliquant des réactions de substitution nucléophile sur l'atome de phosphore. Nous avons montré que les diazaphosphonamides pouvaient être des bases de Lewis efficaces dans la réaction d'ouverture asymétrique des époxydes méso par le SiCl4 conduisant à des 1,2-chlorhydrines chirales avec des e. E. Atteignant les 70%. Une étude par RMN 1H, 31P et 29Si à basse température a mis en évidence une interaction entre le SiCl4 et les phosphonamides conduisant notamment à des espèces hexacoordinées du silicium. Ces diazaphosphonamides chiraux ont aussi donné des résultats prometteurs dans la réduction asymétrique de l'a-chloroacétophénone par le borane avec des e. E. Compris entre 18% et 61%. Le potentiel de ces phosphonamides chiraux laisse entrevoir des applications dans d'autres processus catalytiques faisant intervenir des bases de Lewis
A diversity of new mono- and bifunctional diazaphosphonamides was prepared through diastereoselective nucleophilic substitution reactions at phosphorus atom. Our works demonstrated that diazaphosphonamides could be efficient Lewis base catalysts in the asymmetric ring opening of meso epoxides with SiCl4 affording the corresponding chiral 1,2-chlorohydrins of up to 70% e. E. An interaction between SiCl4 and phosphonamides exhibiting the formation of hexacoordinated silicon species was observed by low temperature 1H, 31P and 29Si NMR studies. Good results were also obtained in the borane asymmetric reduction of a-chloroacetophenone catalyzed by chiral phosphonamides with enantioselectivities of up to 61%. These new chiral phosphonamides could also be applied in other catalytic processes involving Lewis bases

Los estilos APA, Harvard, Vancouver, ISO, etc.

Maillard, David. "Nouveaux ligands perfluorés : synthèse et applications en catalyse". Lyon 1, 2002. http://www.theses.fr/2002LYO10147.

Texto completo

Resumen

Parmi les nombreuses méthodes nouvelles d'hétérogénéisation de catalyseurs homogènes, le concept de FBS ("Fluorous Biphase System") constitue une approche originale permettant de séparer efficacement les produits de la réaction du catalyseur, ce dernier pouvant être récupéré quantitativement sous sa forme active et, ainsi, recyclé. Dans l'objectif d'élargir le champ d'application de cette technique d'immobilisation, nous avons tout d'abord développé la synthèse d'une famille de nouvelles arylphosphines perfluorées, dont les complexes du rhodium se sont révélés particulièrement actifs dans l'hydrogénation d'alcènes fonctionnalisés en système biphasique fluoré. De tels systèmes ont pu être recyclés efficacement selon le choix des ligands. En vue d'une extension en catalyse asymétrique, nous avons également préparé plusieures phosphines chirales à chaîne perfluoréees dont les propriétés catalytiques ont été, de façon préliminaire, étudiées dans les réactions d'alkylation allylique, d'hydrogénation et d'hydroboration en milieu homogène. Enfin, les complexes de l'iridium associé à des salens perfluorés ont été utilisés avec succès dans la réduction asymétrique de cétones par tranfert d'hydrogène dans un système FBS. La réduction de ces ligands en diamines correspondantes permet le recyclage efficace du système catalytique, qui gagne alors en stabilité vis à vis des conditions réactionnelles.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Mattmann, Eric. "7-phosphanorbornènes : synthèse, coordination et applications en catalyse". Palaiseau, Ecole polytechnique, 2002. http://www.theses.fr/2002EPXX0011.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Más fuentes

Libros sobre el tema "Applications en catalyse"

Starks, Charles M. Phase-transfer catalysis: Fundamentals, applications, and industrial perspectives. New York: Chapman & Hall, 1994.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Marcilly, Christian. Catalyse acido-basique: Application au raffinage et à la pétrochimie. Paris, France: Editions Technip, 2003.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

D, Ittel Steven, ed. Homogeneous catalysis: The applications and chemistry of catalysis by soluble transition metal complexes. 2^a ed. New York: Wiley, 1992.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

H, Bartholomew Calvin, ed. Fundamentals of industrial catalytic processes. 2^a ed. Hoboken, N.J: Wiley, 2005.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Scanning tunneling microscopy in surface science, nanoscience and catalysis. Weinheim: Wiley-VCH, 2010.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

library, Wiley online, ed. Iron catalysis in organic chemistry: Reactions and applications. Weinheim: Wiley-VCH, 2008.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Parmon, V. N. Thermodynamics of non-equilibrium processes for chemists with a particular application to catalysis. Amsterdam: Elsevier Science, 2010.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Lennon, D., Justin Hargreaves y S. David Jackson, eds. Catalysis in Application. Cambridge: Royal Society of Chemistry, 2007. http://dx.doi.org/10.1039/9781847550347.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Engineering catalysis. Berlin: De Gruyter, 2013.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

(Firm), BP. Hazards of nitrogen and catalyst handling. 5^a ed. Rugby, UK: Institution of Chemical Engineers, 2006.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Más fuentes

Capítulos de libros sobre el tema "Applications en catalyse"

Neurock, Matthew. "Applications: Catalysis". En Applying Molecular and Materials Modeling, 107–47. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-0765-7_8.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Yasukawa, Tomohiro, Hiroyuki Miyamura y Shū Kobayashi. "Applications in Catalysis". En Chiral Nanomaterials: Preparation, Properties and Applications, 223–58. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527682782.ch8.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

de la Cruz, Fabiola N., José Domingo Rivera-Ramírez, Julio López y Miguel A. Vázquez. "Catalysis". En Green Chemistry and Applications, 177–214. Boca Raton, FL : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780429291166-11.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Schmal, Martin. "Catalyst Preparation". En Heterogeneous Catalysis and its Industrial Applications, 161–87. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-09250-8_7.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Cornils, Boy. "Commercial Applications". En Multiphase Homogeneous Catalysis, 291–96. Weinheim, Germany: Wiley-VCH Verlag GmbH, 2008. http://dx.doi.org/10.1002/9783527619597.ch2e.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Jobic, H. "Applications of Neutron Scattering to Catalysis". En Catalyst Characterization, 347–75. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4757-9589-9_13.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Jobic, Hervé. "Catalysis". En Neutron Scattering Applications and Techniques, 17–31. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06656-1_2.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Mirodatos, C. "Mass Spectrometry: Principles and Applications in Catalysis". En Catalyst Characterization, 651–74. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4757-9589-9_23.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Han, Changseok, Endalkachew Sahle-Demessie, Afzal Shah, Saima Nawaz, Latif-ur-Rahman, Niall B. McGuinness, Suresh C. Pillai, Hyeok Choi, Dionysios D. Dionysiou y Mallikarjuna N. Nadagouda. "Catalysis for Environmental Applications". En Sustainable Catalysis, 207–30. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527693030.ch8.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Dingerdissen, Uwe y Juan Almena. "Toward Economic Applications". En Multiphase Homogeneous Catalysis, 835–39. Weinheim, Germany: Wiley-VCH Verlag GmbH, 2008. http://dx.doi.org/10.1002/9783527619597.ch7e.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Actas de conferencias sobre el tema "Applications en catalyse"

Parks, James E., H. Douglas Ferguson, Aaron M. Williams y John M. E. Storey. "Lean NOx Trap Catalysis for NOx Reduction in Natural Gas Engine Applications". En ASME 2004 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/icef2004-0871.

Texto completo

Resumen

Reliable power generation and distribution is a critical infrastructure for the public and industry. Large-bore spark-ignited natural gas reciprocating engines are a reliable source of power generation. Lean operation enables efficient operation, and engines can conveniently be placed wherever natural gas resources are located. However, stricter emission regulations may limit the installation and use of more natural gas reciprocating engines if emissions cannot be reduced. Natural gas engine emissions of concern are generally methane, carbon monoxide, and oxides of nitrogen (NOx). Methane and carbon monoxide can be controlled by oxidation catalysts; however NOx emissions are difficult to control in lean exhaust conditions. One method of reducing NOx in lean exhaust conditions is lean NOx trap catalysis. Lean NOx trap technologies (also known as NOx adsorber catalysts, NOx storage and reduction catalysts, etc.) have demonstrated >90% NOx reduction for diesel reciprocating engines and natural gas turbines. In the work presented here, the feasibility of a lean NOx trap catalyst for lean burn natural gas reciprocating engines will be studied. Tests were conducted on a Cummins 8.3-liter engine on a dynamometer. The lean Nox trap catalyst was controlled in a valved exhaust system that utilized natural gas as the catalyst reductant. Oxidation and reformer catalysts were used to enhance utilization of methane for catalyst regeneration. The feasibility of this approach will be discussed based on the observed NOx reduction and associated fuel penalties.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Bhushan, Indu. "Efficient media for high production of microbial lipase from Bacillus subtilis (BSK-L) using response surface methodology for enantiopure synthesis of drug molecules". En 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.044.

Texto completo

Resumen

Lipases are a multipurpose enzyme that holds a significant position in industrial applications due to its ability to catalyse a large number of reactions such as hydrolysis, esterification, interesterification, transesterification which makes it a potential candidate. It is also used for the separation of chiral drugs from the racemic mixture and this property of lipase is considered very important in pharmaceutical industries for the synthesis of enantiopure bioactive molecules. Assuming the tremendous importance of lipases, as stereoselective biocatalysts, in pharmaceuticals and various other commercial applications, industrial enzymologists have been forced to search for those microorganisms which are able to produce novel biocatalysts at reasonably high yield. In the present study microbial lipase was isolated from the water sample of pond at Katra, Jammu and Kashmir (India). This enzyme has shown wide specificity and higher enantioselectivity, which make it pharmaceutical important enzyme. To make it economical for industrial application, it was produced on cheap nutrient media using Response Surface Methodology and got maximum production. It was used for resolution of chiral drugs and the significant results obtained during the course of work shall have potential towards pharmaceutical industries.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Lee, C. H., C. H. Huang, C. T. Lin, Y. C. Liu y Hsin-Sen Chu. "Development of Methanol Reformer for the Portable PEFC Power System by ITRI". En ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2004. http://dx.doi.org/10.1115/fuelcell2004-2519.

Texto completo

Resumen

In order to apply the PEFC power generation system in near future, ITRI is cooperating with Taiwanese local electrical company to develop a compact methanol reformer. This methanol reformer can simultaneously catalyze autothermal and steam reforming reactions, depending on the application. Except the catalyst for methanol steam reforming and low temperature water gas shift reactions, ITRI has developed several catalysts for autothermal reforming, high temperature water-gas shift, and CO preferential oxidation reactions. We have integrated these catalysts to assemble a methanol reformer prototype. The characteristics of this methanol reformer operated at steady state are the maximum flow rate of hydrogen being 39 L/min (corresponding to 2.4 kWe), H2 concentration being 45∼65%, CO concentration less than 50 ppm, and the cold startup time less than 35 minutes. In addition, we have been developing a catalyst for methanation reaction. We hope to shorten the start-up time to less than 20 minutes and the volume of the reformer being reduced in half by integrating a good methanation catalyst into my next generation methanol reformer.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Jayasuriya, Jeevan, Arturo Manrique, Reza Fakhrai, Jan Fredriksson y Torsten Fransson. "Experimental Investigations of Catalytic Combustion for High-Pressure Gas Turbine Applications". En ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90986.

Texto completo

Resumen

Catalytic combustion has proven to be a suitable alternative to conventional flame combustion in gas turbines for achieving Ultra-Low Emission levels (ULE). In the process of catalytic combustion, it is possible to achieve a stable combustion of lean fuel/air mixtures which results in reduced combustion temperature in the combustor. The ultimate result is that almost no thermal-NOx is formed and the emissions of carbon monoxide and hydrocarbon emissions are reduced to single-digit limits. Successful development of catalytic combustion technology would lead to reducing pollutant emissions in gas turbines to ultra-low levels at lower operating costs. Since the catalytic combustion prevents the pollutant formations in the combustion there is no need for costly emission cleaning systems. High-quality experimental data of combustion catalyst operations at gas turbine working conditions and validated numerical models are essential tools for the design and development of catalytic gas turbine combustors. The prime objective of the work presented in this paper was to obtain catalytic operational data under said conditions. Experimental investigations were carried out to determine the operational data on different types of combustion catalysts against different fuel types at gas turbine operational conditions. A pilot-scale 100 k W high-pressure combustion test facility was used for the experimental investigations of catalytic combustion under real gas turbine conditions. Combustor pressure can be maintained at any desired level between 1 to 35 bars. The maximum combustion air supply is 100 g/s, which can be electrically preheated up to 600°C and humidified up to 30% of weight as required by test conditions. Catalysts used in the test facility are highly active noble metal catalysts for ignition purposes and thermally stable metal oxide catalysts for continuing reactions. Tests are conducted as the testing of single catalyst segments or combinations of several segments. The measurements taken are flow rates (air/fuel ratio) temperatures (inlet, surface and the outlet of each catalyst segment), pressure (combustor) and emissions of NOx, CO and UHC. This paper presents the design of the high-pressure catalytic combustion test facility and an experimental comparison of methane combustion over Pd on alumina and Pd/Pt (bi-metal) on alumina catalysts at varying pressure levels up to 20 bars. The catalysts concerned were cylindrical shaped (35 mm in diameter and 20 mm in height) honeycomb type fully coated catalysts. The results showed that the Pt/Pd on alumina catalysts is better in low temperature ignition and combustion stability over the Pd on alumina catalysts. Emission measurements showed that the fuel conversion over the tested Pt/Pd on alumina catalyst was around 10% while fuel conversion over a similar Pd on alumina catalyst (geometry and capacity) was only 4%. Fuel conversion rates showed the tendency to be further reduced (over the same catalysts) against increasing pressure.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Guo, Kun y Ahalapitiya H. Jayatissa. "Growth of Carbon Nanotubes on Metallic Catalyst by CVD". En ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15356.

Texto completo

Resumen

The growth of carbon nanotubes was investigated using a filament assisted atmospheric CVD system. The scope of this study is two fold: (i) control the growth of carbon nanotubes by chemical treatment of catalysis surface and temperatures and (ii) study of nanotubes growth for gas sensor applications. We have conducted the growth of carbon nanotubes on surfaces by treatment of metal catalyst surface with different acids and plasma. The treated surfaces were kept in a furnace tube CVD and the nanotubes were grown using a hot filament assisted decomposition of methane (CH4) and argon (Ar) gas mixture. It was found that the growth of carbon nanotubes could be controlled by the catalysts, filament and furnaces temperature.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Parks, James E. "Mitigation of Sulfur Effects on a Lean NOx Trap Catalyst by Sorbate Reapplication". En ASME 2007 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/icef2007-1628.

Texto completo

Resumen

Lean NOx trap catalysis has demonstrated the ability to reduce NOx emissions from lean natural gas reciprocating engines by >90%. The technology operates in a cyclic fashion where NOx is trapped on the catalyst during lean operation and released and reduced to N2 under rich exhaust conditions; the rich cleansing operation of the cycle is referred to as “regeneration” since the catalyst is reactivated for more NOx trapping. Natural gas combusted over partial oxidation catalysts in the exhaust can be used to obtain the rich exhaust conditions necessary for catalyst regeneration. Thus, the lean NOx trap technology is well suited for lean natural gas engine applications. One potential limitation of the lean NOx trap technology is sulfur poisoning. Sulfur compounds directly bond to the NOx trapping sites of the catalyst and render them ineffective; over time, the sulfur poisoning leads to degradation in overall NOx reduction performance. In order to mitigate the effects of sulfur poisoning, a process has been developed to restore catalyst activity after sulfur poisoning has occurred. The process is an aqueous-based wash process that removes the poisoned sorbate component of the catalyst. A new sorbate component is reapplied after removal of the poisoned sorbate. The process is low cost and does not involve reapplication of precious metal components of the catalyst. Experiments were conducted to investigate the feasibility of the washing process on a lean 8.3-liter natural gas engine on a dynamometer platform. The catalyst was rapidly sulfur poisoned with bottled SO2 gas; then, the catalyst sorbate was washed and reapplied and performance was reevaluated. Results show that the sorbate reapplication process is effective at restoring lost performance due to sulfur poisoning. Specific details relative to the implementation of the process for large stationary natural gas engines will be discussed.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Karakurkchi, A., N. Sakhnenko, M. Ved, I. Parsadanov y S. Menshov. "Nanostructured Oxide-Metal Catalysts for Intra-Cylinder Catalysis". En 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP). IEEE, 2018. http://dx.doi.org/10.1109/nap.2018.8914840.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Furuya, Tomiaki, Terunobu Hayata, Susumu Yamanaka, Junji Koezuka, Toshiyuki Yoshine y Akio Ohkoshi. "Hybrid Catalytic Combustion for Stationary Gas Turbine: Concept and Small Scale Test Results". En ASME 1987 International Gas Turbine Conference and Exhibition. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/87-gt-99.

Texto completo

Resumen

Catalytic combustion for gas turbine applications has been investigated. Its significant advantages in reducing combustor emissions, particularly nitrogen oxides (NOx), have been shown. One of the main problems in regard to developing a catalytic combustor is the durability of catalysts, because the catalysts deteriorate during high temperature operation, which is normal for current gas turbines and near future gas turbines. The hybrid catalytic combustion concept has advantages concerned with catalyst durability. This paper shows its concept and small scale test results. This hybrid catalytic combustion concept comprises the following steps; premix fuel and air for a catalyst-packed zone; operate catalysts at rather low temperatures, to prolong catalyst life; add fresh fuel into the stream at the catalyst-packed zone outlet, where gas phase combustion occurs completely without a catalyst; add dilution air into the stream at the gas phase combustion zone outlet with a by-pass valve. Experimental data and analyses indicated that this hybrid catalytic combustion has a potential of being applicable to current gas turbines (turbine inlet temperature is about 1100°C) and near future gas turbines (turbine inlet temperature is about 1300°C).

Los estilos APA, Harvard, Vancouver, ISO, etc.

McGuire, Nicholas E., Neal P. Sullivan, Robert J. Kee, Huayang Zhu, James A. Nabity, Jeffrey R. Engel, David T. Wickham y Michael Kaufman. "Hexaaluminate Catalysts for Fuel Reforming". En ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65231.

Texto completo

Resumen

Hexaaluminate catalysts offer excellent high-temperature stability compared to the equivalent metal-based catalysts. Their stability also lends well to use as a catalyst support. However, use of novel hexaaluminates is limited in fuel processing for fuel-cell applications. In this paper, we report on the performance of hexaaluminates as a catalyst support in the steam reforming of methane. The hexaaluminates are synthesized by a metal-exchange process using alumoxane precursors that enable a wide range of metal substitutions. Performance is evaluated using a unique stagnation-flow reactor that enables detailed probing of the boundary layer above the catalyst-impregnated stagnation surface. Experimental results are compared with models to understand fundamental reaction kinetics and optimize catalyst performance. RhSr-substituted hexaaluminates with a Rh impregnation are shown to yield the best performance. Scanning- and Transmission-Electron Microscopy are used to characterize the different types of hexaaluminates, and to examine the effect of aging on catalyst structure.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Colucci, Jose´ A. "Hydrogen Production Using Autothermal Reforming of Biodiesel and Other Hydrocarbons for Fuel Cell Applications". En ASME 2006 International Solar Energy Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/isec2006-99018.

Texto completo

Resumen

The department of Chemical Engineering of the University of Puerto Rico (UPRM) in collaboration with Argonne National Laboratory (ANL) works in the development of a reforming catalyst characterization program. The purpose of this research is to study the viability of using new catalysts to convert Biodiesel, Glycerin and Methanol to a hydrogen rich product gas and compare their production potential, identify the conditions for the accumulation of coke and determine the influence of reactor temperature and water to carbon and oxygen to carbon ratios. A Basket Stirred Tank Reactor (BSTR), Plug Flow Reactor (PFR), Gas Chromatography Mass Spectrophotometer (GCMS) and Gas Chromatography Thermal Conductivity Detector (GCTCD), and Pt and Rh-based catalysts synthesized at ANL were used. During the preliminary ATR experiments, methanol, glycerol and biodiesel showed an increase in H2 production with decreasing O2/C ratio and increases in the reactor temperature. Additionally, Scanning Electron Microscopy (SEM) and EDAX analysis has been performed in some of the catalysts samples. All biodiesel and glycerol experiments performed had shown coke formation. Future research will include, experiments with bio-ethanol and methane as fuel using a Ni-based catalyst synthesized at ANL.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Informes sobre el tema "Applications en catalyse"

Pfefferle, L. D. y A. Datye. Palladium Catalysis for Energy Applications. Office of Scientific and Technical Information (OSTI), marzo de 2001. http://dx.doi.org/10.2172/833766.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Pfefferle, L. D. y Abhaya Datye. Palladium catalysis for energy applications. Office of Scientific and Technical Information (OSTI), marzo de 2001. http://dx.doi.org/10.2172/799205.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Ryba, G., J. Shelnutt, N. Doddapaneni y K. Zavadil. Fuel cell applications for novel metalloporphyrin catalysts. Office of Scientific and Technical Information (OSTI), abril de 1997. http://dx.doi.org/10.2172/469172.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Matson, D. W., J. C. Linehan, J. G. Darab, D. M. Camaioni, S. T. Autrey y E. Lui. New nanophase iron-based catalysts for hydrocracking applications. Office of Scientific and Technical Information (OSTI), noviembre de 1994. http://dx.doi.org/10.2172/10109036.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Fetterly, Brandon Michael. Synthesis and application of new polymer bound catalysts. Office of Scientific and Technical Information (OSTI), enero de 2005. http://dx.doi.org/10.2172/850090.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Huh, Seong. Morphological Control of Multifunctional Mesoporous Silica Nanomaterials for Catalysis Applications. Office of Scientific and Technical Information (OSTI), diciembre de 2004. http://dx.doi.org/10.2172/837271.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Parks, II, James E., John Morse Storey, Timothy J. Theiss, Senthil Ponnusamy, Harley Douglas Ferguson, Aaron M. Williams y James B. Tassitano. Lean NOx Trap Catalysis for Lean Natural Gas Engine Applications. Office of Scientific and Technical Information (OSTI), septiembre de 2007. http://dx.doi.org/10.2172/932107.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Dosch, R. G., H. P. Stephens y F. V. Stohl. Hydrous metal oxide-supported catalysts: Part 2, Catalytic properties and applications. Office of Scientific and Technical Information (OSTI), febrero de 1990. http://dx.doi.org/10.2172/5003423.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Cundari, T. R. Improved Modeling of Transition Metals, Applications to Catalysis and Technetium Chemistry. Office of Scientific and Technical Information (OSTI), marzo de 2004. http://dx.doi.org/10.2172/833745.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Senum, G. I., E. A. Cote, T. W. D'Ottavio y R. N. Dietz. Hydrocarbon precombusting catalyst survey and optimization for perfluorocarbon tracer analysis in subsurface tracer applications. Office of Scientific and Technical Information (OSTI), mayo de 1989. http://dx.doi.org/10.2172/6086672.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Ofrecemos descuentos en todos los planes premium para autores cuyas obras están incluidas en selecciones literarias temáticas. ¡Contáctenos para obtener un código promocional único!