Log in

Relevant bibliographies by topics / Bifunctional catalysis / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Bifunctional catalysis.

Dissertations / Theses on the topic 'Bifunctional catalysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Bifunctional catalysis.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Goldys, Anna M. "Immobilisation and application of bifunctional iminophosphorane organocatalysts." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:f4f28a47-0373-4b66-8537-d4e7028d4d63.

Full text

Abstract:

Bifunctional iminophosphoranes, containing a triaryl-substituted iminophosphorane and bis(3,5- trifluoromethyl)phenyl thiourea on a single enantiomer scaffold are novel asymmetric superbase organocatalysts reported by the Dixon group in 2014. This thesis describes our efforts to expand their scope and utility in a variety of challenging chemical transformations. Chapter 2 describes the development and application of immobilised bifunctional iminophosphorane organocatalysts. We have successfully immobilised bifunctional iminophosphoranes on a crosslinked polystyrene support and applied this sol

APA, Harvard, Vancouver, ISO, and other styles

2

Daly, Christopher Gary. "Applications of amido-N-heterocyclic carbene ligands in bifunctional catalysis." Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/27800.

Full text

Abstract:

This thesis describes the synthesis of amino/amido-N-heterocyclic carbene (NHC) complexes of late transition metals, in order to investigate bifunctional catalysis involving a metal-amido bond. Chapter one introduces bifunctional catalysis, with an emphasis on the mechanism of bifunctional bond-breaking during catalytic reactions. Mechanisms of C-H activation are described and the features of bifunctional C-H activation (AMLA) discussed. The ligand properties, and methods of synthesis, of NHC and amido ligands are described, and the choice of ligand to investigate bifunctional catalysis ration

APA, Harvard, Vancouver, ISO, and other styles

3

Yamaguchi, Yukako. "Molecular Design of Bifunctional Amino Sulfonamides for Asymmetric Enamine Catalysis." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124447.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Knapp, Spring Melody, and Spring Melody Knapp. "Investigation of Secondary Coordination Sphere Effects for Cyanohydrin Hydration with Transition Metal Catalysts." Thesis, University of Oregon, 2012. http://hdl.handle.net/1794/12362.

Full text

Abstract:

The synthesis of high value acrylic monomers is currently done industrially via cyanohydrin hydration using concentrated acids, resulting in large quantities of useless byproducts. This current process is energy intensive and lacks atom economy; therefore, alternative cyanohydrin hydration strategies are under investigation. Ideally, cyanohydrin hydration would be done using organometallic nitrile hydration catalysts. Cyanohydrin hydration with these catalysts is challenging, because it needs to be done at low temperatures and under acidic conditions to reduce cyanohydrin degradation and catal

APA, Harvard, Vancouver, ISO, and other styles

5

Kinghorn, Michael James. "Bifunctional Helical Peptide Catalysts for Enzyme-like Reactivity and Selectivity and Selective Stapling of Natural Amino Acid Residues with Hydrophilic Squaric Acid Derivatives." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8714.

Full text

Abstract:

Peptide secondary structure provides an exceptional scaffold on which to design highly reactive and selective enzyme-like catalysts. This work describes the rational design and synthesis of a suite of helical peptide catalysts that are capable of achieving proximity-induced rate enhancement in Diels-Alder cycloadditions and indole alkylations. Microwave assisted synthesis of resin-supported polypeptides enables incorporation of non-natural amino acid residues that induce helicity (Aib) or provide functional handles on which organic catalytic residues can be attached. These small peptide cat

APA, Harvard, Vancouver, ISO, and other styles

6

Fitchett, Brandon. "Oxidation State Roulette:Synthesis and Reactivity of Cobalt Complexes Containing SNS Ligands." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38566.

Full text

Abstract:

The use of rare and expensive noble metals in the chemical industry as organometallic catalysts has grown exponentially in the past few decades due to their high activity, selectivity and their ability to catalyze a wide range of reactions. With this growth in use has also come a proportional growth in concern as these toxic metals inevitably leach into the environment and their negative effects on public health and our ecosystems are becoming better understood. First-row transition metal catalysts provide both environmental and economic benefits as alternatives to these noble metals due to th

APA, Harvard, Vancouver, ISO, and other styles

7

Abudawood, Raed Hasan. "Hydroisomerization of alkanes over metal-loaded zeolite catalysts." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/hydroisomerization-of-alkanes-over-metalloaded-zeolite-catalysts(4511d50c-ff42-49e6-9a8a-d7ad88576bb1).html.

Full text

Abstract:

Zeolite catalysis plays an important role in many industrial applications due to their unique properties and has become widely used in the area of oil refining. Of particular interest is Zeolite Y, which can be hydrothermally treated into its ultrastable form, USY. USY offers a superior practicality, especially when dealuminated and metal-loaded. The importance of alkanes hydroisomerization arises from the continuingly stricter regulations imposed on the utilization of gasoline as an automotive fuel. The requirements to reduce the aromatics content in gasoline present a need to find an alterna

APA, Harvard, Vancouver, ISO, and other styles

8

Cesari, Cristiana <1988&gt. "Novel Ruthenium Complexes for Bifunctional Catalysis: the Dual Role of Cyclopentadienone and N-Heterocyclic Carbene." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7525/1/cesari_cristiana_tesi.pdf.

Full text

Abstract:

The PhD thesis herein presented deal with the synthesis, characterization and catalytic application of new ruthenium transition metal complexes which exhibit unprecedented combination of ligands: cyclopentadienones and N-heterocyclic carbenes (NHC). In the first year of the PhD work it was developed a straightforward and efficient synthetic route to novel Ru N-heterocyclic carbenes (NHC) complexes by transmetallation of non-bulky imidazolylidene silver complexes to ruthenium dicarbonyl tetraarylcyclopentadienone. The same procedure with sterically demanding NHC resulted in the formation of unp

APA, Harvard, Vancouver, ISO, and other styles

9

Cesari, Cristiana <1988&gt. "Novel Ruthenium Complexes for Bifunctional Catalysis: the Dual Role of Cyclopentadienone and N-Heterocyclic Carbene." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7525/.

Full text

Abstract:

The PhD thesis herein presented deal with the synthesis, characterization and catalytic application of new ruthenium transition metal complexes which exhibit unprecedented combination of ligands: cyclopentadienones and N-heterocyclic carbenes (NHC). In the first year of the PhD work it was developed a straightforward and efficient synthetic route to novel Ru N-heterocyclic carbenes (NHC) complexes by transmetallation of non-bulky imidazolylidene silver complexes to ruthenium dicarbonyl tetraarylcyclopentadienone. The same procedure with sterically demanding NHC resulted in the formation of unp

APA, Harvard, Vancouver, ISO, and other styles

10

Catherin, Nelly. "Selective ring opening of naphthenes over bifunctional catalysts in the presence of H2S." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1246.

Full text

Abstract:

L'ouverture sélective de cycle (OSC) d'hydrocarbures polycycliques vise à augmenter le nombre de cétane des carburants diesel. OSC efficace peut être atteint par l'hydroconversion sur des catalyseurs bifonctionnels métal noble/fonction acide. La décaline et, à plus faible mesure, le perhydroindane, le butylcyclohexane et la tétraline, ont été utilisés comme molécules modèles pour l'étude des l'OSC de sulfures de métaux de transition (TMSs) supportés sur zéolithes ou silice-alumine amorphe dans un réacteur à lit fixe sous haute pression (5 MPa) avec une concentration élevée d'H2S dans la charge

APA, Harvard, Vancouver, ISO, and other styles

11

Arkhipenko, Sergey Yurievich. "Approaches to novel B-N chemistry at the boundary of frustrated Lewis pairs and bifunctional catalysis." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12213/.

Full text

Abstract:

This project is devoted to boron chemistry in two ways. Firstly, the development of the boron – nitrogen “Frustrated” Lewis Pairs (FLPs) was investigated by combining the principles of this approach with known bifunctional catalytic methods. This also included design and synthetic efforts towards new bifunctional catalysts 108 and 157 on the basis of L-proline connected to Lewis acidic borane or borinic derivatives, which revealed multiple peculiarities of boron chemistry. Catalyst 176 was successfully utilised in nitro-Michael addition reaction. Secondly, boronic acids are promising catalysts

APA, Harvard, Vancouver, ISO, and other styles

12

DAKA, PHILIAS. "ENAMINE-METAL LEWIS ACID BIFUNCTIONAL CATALYSTS FOR ASYMMETRIC ALDOL REACTIONS. DESIGN AND SYNTHESIS OF STAT3 INHIBITORS." Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1374852476.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Isik, Murat. "Chiral 2-aminodmap/sulfonamides And Squaramides Asbifunctional Acid/base Organocatalysts In Asymmetriccatalysis." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613444/index.pdf.

Full text

Abstract:

Synthesis and evaluation of catalytic performances of novel bifunctional 2- aminoDMAP-Thiourea/ Sulfonamide/ Squaramide organocatalysts derived from trans-(R,R)-cyclohexane-1,2-diamine forms the main goal of this thesis. For this purpose, direct selective mono-N-pyridilization of trans-(R,R)-cyclohexane-1,2- diamine via Pd and Cu catalysis is described successfully first. Facile preparation of chiral 2-aminoDMAP core catalaphore led to the development of various 2- aminoDMAP- Thiourea/ Sulfonamides/ Squaramides as bifunctional acid/base organocatalyst libraries (most in two-steps overall) whic

APA, Harvard, Vancouver, ISO, and other styles

14

Akanksha, Tyagi. "Development of novel hybrid catalysis for carbon-carbon couplings by titanium oxide photocatalyst and metal cocatalyst." Kyoto University, 2018. http://hdl.handle.net/2433/232379.

Full text

Abstract:

Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(人間・環境学)<br>甲第21178号<br>人博第850号<br>新制||人||203(附属図書館)<br>29||人博||850(吉田南総合図書館)<br>京都大学大学院人間・環境学研究科相関環境学専攻<br>(主査)教授吉田寿雄, 教授内本喜晴, 教授田部勢津久<br>学位規則第4条第1項該当

APA, Harvard, Vancouver, ISO, and other styles

15

Shevchenko, Grigory André [Verfasser], Benjamin [Gutachter] List, and Hans-Günther [Gutachter] Schmalz. "Enol Catalysis – Enantioselective Transformations via Bifunctional Brønsted Acid Promoted Enolization / Grigory André Shevchenko ; Gutachter: Benjamin List, Hans-Günther Schmalz." Köln : Universitäts- und Stadtbibliothek Köln, 2018. http://d-nb.info/1168245893/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Sammoury, Hussein. "Synthesis of new zeolitic materials for hydroisomerization of n-alkanes by bifunctional catalysis to obtain medium distillates (C10-C14)." Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT2289/document.

Full text

Abstract:

Deux zéolithes nanocristaux de type *BEA et CP814E commerciales avec de différentes propriétés texturales, et une zéolithe microcristaux de type *BEA qui a été synthétisée durant cette thèse, ont été modifiées par une desilication en utilisant de différents traitements alcalins. Toutes les zéolithes parentes et certaines désilicées ont été sélectionnée pour le craquage du n-hexane, où aucune amélioration significative de la conversion n'a été observée après la désilication. Toutes les zéolithes parentes et quelques désilicées sélectionnées ont été transformés en leur forme bifonctionnelle par

APA, Harvard, Vancouver, ISO, and other styles

17

Miceli, Claudia. "Aminotriphenolate complexes for effective epoxide activation." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3424731.

Full text

Abstract:

This thesis focuses on the synthesis of vanadium(V) and molybdnenum(VI) aminotriphenolate complexes VO(Ld,h,q,r), MoO(Lc)(TU), MoO(Lc)(U), Al(Lq,r,s)(DMF) and their use in activation of epoxides in ring opening reactions by amines and CO2 cycloadditions. Triphenolamines have been chosen as ligands because of their high versatility in metal complexation and the possibility of functionalization. Indeed, it will be pointed out that according to the metal employed and the different ligand substitutions, aminotriphenolate complexes exert a preferential activity towards a specific reaction or substr

APA, Harvard, Vancouver, ISO, and other styles

18

Chen, Li. "New developments in green asymmetric catalysis : Application to Michael reaction and ring opening polymerisation." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS162.

Full text

Abstract:

La synthèse asymétrique organo-catalysée est un domaine de recherche en pleine expansion visant une chimie plus verte. Nous nous sommes intéressés au développement d’une réaction de Michael asymétrique organocatalysée en mettant à profit la catalyse par liaison hydrogène et l’activation énamine afin de contrôler en une seule étape la formation d’adduits portant un centre carboné quaternaire à partir de cétones non activées. Ainsi, nous avons développé des organocatalyseurs bifonctionnels de type squaramide qui ont permis d’obtenir les adduits de Michael attendu à partir de cycloalcanones alpha

APA, Harvard, Vancouver, ISO, and other styles

19

KRSTIC, MILENA. "IN BATCH AND IN FLOW SYNTHESIS OF QUATERNARY AMINO ACIDS/AMINO DERIVATIVES." Doctoral thesis, Università degli Studi di Milano, 2022. https://hdl.handle.net/2434/938246.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

González, Miera Greco. "Homogeneous and heterogeneous Cp*Ir(III) catalytic systems : Mechanistic studies of redox processes catalyzed by bifunctional iridium complexes, and synthesis of iridium-functionalized MOFs." Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-143343.

Full text

Abstract:

The purpose of this doctoral thesis is to investigate and develop catalytic processes mediated by iridium(III) complexes. By understanding the mechanisms, the weaknesses of the designed catalysts can be identified and be overcome in the following generation. The thesis is composed of two general sections dedicated to the synthesis and applications of homogeneous catalysts and to the preparation of heterogeneous catalysts based on metal-organic frameworks (MOFs). After a general introduction (Chapter 1), the first part of the thesis (Chapters 2-4, and Appendix 1) covers the use of several homog

APA, Harvard, Vancouver, ISO, and other styles

21

Tampieri, Alberto. "Synthesis, reactivity and applications of 3,5-dimethyl-4-nitroisoxazole derivatives." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10014/.

Full text

Abstract:

3,5-dimethyl-4-nitroisoxazole derivatives are useful synthetic intermediates as the isoxazole nucleus chemically behaves as an ester, but establish better-defined interactions with chiral catalysts and lability of its N-O aromatic bond can unveil other groups such as 1,3-dicarbonyl compounds or carboxylic acids. In the present work, these features are employed in a 3,5-dimethyl-4-nitroisoxazole based synthesis of the γ-amino acid pregabalin, a medication for the treatment of epilepsy and neuropatic pain, in which this moiety is fundamental for the enantioselective formation of a chiral center

APA, Harvard, Vancouver, ISO, and other styles

22

Schreiber, Moritz Wilhelm [Verfasser], Johannes A. [Akademischer Betreuer] Lercher, Thomas [Gutachter] Brück, and Johannes A. [Gutachter] Lercher. "Bifunctional catalysis of metal and Brønsted acid sites for hydrodeoxygenation of triglycerides and dehydrogenation of light alkanes / Moritz Wilhelm Schreiber ; Gutachter: Thomas Brück, Johannes A. Lercher ; Betreuer: Johannes A. Lercher." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1173898875/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Brito, Sousa Larissa. "Hydroisomerization and hydrocracking of naphthenes." Thesis, Lyon, 2020. https://n2t.net/ark:/47881/m60v8c55.

Full text

Abstract:

L'hydrocraquage est un procédé flexible utilisé pour la conversion de charges lourdes de pétrole vers des coupes plus légères, par exemple, lors de l'hydroconversion des Distillats sous Vide (DSV) dans des distillats moyens. Le DSV est majoritairement composé par des molécules cycliques (aromatiques et naphtènes), mais les mécanismes qui régissent la transformation de composés polycycliques ne sont pas encore bien maîtrisés, contrairement aux alcanes, qui sont vastement rapportés dans la littérature. Ce travail a pour but d'étudier l'isomérisation et le craquage de naphtènes, en présence de l'

APA, Harvard, Vancouver, ISO, and other styles

24

Riccioli, Riccardo. "Stereodivergent synthesis of β-trifluoromethyl-α- amino acids by sequential catalytic processes". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16194/.

Full text

Abstract:

In this work, a sequential organocatalytic process for the stereodivergent synthesis of β-trifluoromethyl-α-amino acids using Erlenmeyer azlactones as starting material is presented. The strategy developed consists of a sequential catalytic approach, employing two catalysts that act independently to control the absolute configuration of two different stereocenters. The first step is a catalytic asymmetric hydrogen transfer of the activated double bond of the azlactone promoted by a Jacobsen type thiourea and Hantzsch ester as hydride donor. The second step involves a nucleophilic addition of a

APA, Harvard, Vancouver, ISO, and other styles

25

GOPAL, SRIKANT. "SYNTHESIS, MODIFICATION, CHARACTERIZATION AND CATALYTIC STUDIES OF ZEOLITE BASED BIFUNCTIONAL CATALYSTS FOR HYDROISOMERIZATION REACTION." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1061218813.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Gopal, Srikant. "Synthesis, modification, characterization and catalytic studies of zeolite based bifunctional catalysts for hydroisomerization reactions." Cincinnati, Ohio : University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1061218813.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Stenton, Benjamin James. "Metal mediated mechanisms of drug release." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/284402.

Full text

Abstract:

In this thesis will be described research towards the development of bioorthogonal bond-cleavage reactions, and their applications in targeted drug delivery (Figure 1). The first project relates to the development of a palladium mediated bond-cleavage or "decaging" reaction which can cause a propargyl carbamate to decompose and release an amine. This was further developed by the incorporation of a protein modification handle which allowed an amine-bearing drug to be covalently ligated to a protein by a palladium-cleavable linker. This chemistry was demonstrated by the conjugation of the antica

APA, Harvard, Vancouver, ISO, and other styles

28

Träff, Annika. "Asymmetric transformation of ß- and γ-functionalized alcohols : Study of combined ruthenium-catalyzed racemization and enzymatic resolution". Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-56947.

Full text

Abstract:

The major part of this thesis describes the asymmetric synthesis of β- and γ-amino alcohols through the combination of ruthenium catalyzed racemization and enzymatic kinetic resolution. The dynamic kinetic resolution, DKR, protocol for chlorohydrins was improved by employing Bäckvall’s catalyst, which is a base activated racemization catalyst, in combination with Burkholderia cepacia lipase. These optimized conditions broadened the substrate scope and improved the yields and ee’s of the obtained chlorohydrin acetates. The utility of the method was demonstrated in the synthesis of (S)-salbutamo

APA, Harvard, Vancouver, ISO, and other styles

29

Pialat, Amélie. "Formation de liaisons C-N et C-O par catalyse de coordination ou par oxydation à l'iode hypervalent." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20204/document.

Full text

Abstract:

La fonctionnalisation directe de liaisons C-H offre une alternative plus économe en atomes et étapes que les traditionnelles méthodes de synthèse basées sur la transformation de molécules pré fonctionnalisées. Ainsi, les réactions d'amination intermoléculaire de liaisons C(sp3)-H avec des nitrènoïdes sont généralement effectuées avec des rendements et des régiosélectivités modérés et utilisent pour cela des catalyseurs coûteux. Dans ce contexte, nous avons créé de nouveaux systèmes bifonctionnels pour la formation de liaisons C-N aliphatiques catalysée par le cuivre et l'argent. Ces systèmes s

APA, Harvard, Vancouver, ISO, and other styles

30

Arnold, Kenny. "Design and application of bifunctional organic catalysts." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2514/.

Full text

Abstract:

N,N Diisopropylbenzylamine-2-boronic acid 80a has been shown to be an effective catalyst under refluxing fluorobenzene conditions for direct amide formation between equimolar amounts of carboxylic acids and amines, and under these conditions the catalyst 80a has been shown to be stable. A comparison with other boronic acid catalysts and boric acid has shown 80a to be more effective for more difficult substrates, and evidence for the cooperative effect of the boronic acid and amine moieties, as well as for reaction intermediates, has been obtained. The synthesis of novel derivatives of 80a have

APA, Harvard, Vancouver, ISO, and other styles

31

Jackman, Hayley. "Bifunctional organic catalysts for asymmetric protonation reactions." Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432332.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Zheng, Quanxing. "Conversion of 2,3-butanediol over bifunctional catalysts." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/34461.

Full text

Abstract:

Doctor of Philosophy<br>Department of Chemical Engineering<br>Keith L. Hohn<br>In this study, Cu/ZSM-5 catalysts were used to catalyze the hydrodeoxygenation of 2,3-butanediol to butenes in a single reactor in the presence of hydrogen. The carbon selectivity of butenes increased with increasing SiO₂/Al₂O₃ ratio (lowering acidity of zeolite) and H₂/2,3-butanediol ratio. Cu/ZSM-5 with a SiO₂/Al₂O₃ ratio of 280 showed the best activity toward the production of butenes. On zeolite ZSM-5(280), the carbon selectivity of butenes increased with increasing copper loading and 19.2wt% of CuO showed the h

APA, Harvard, Vancouver, ISO, and other styles

33

Elmekawy, Ahmed. "Bifunctional supported catalysts for fine chemical synthesis." Thesis, University of Huddersfield, 2014. http://eprints.hud.ac.uk/id/eprint/23325/.

Full text

Abstract:

The objective was to prepare and optimise solid acid and solid base catalysts for liquid phase reactions. The approach has been to functionalize porous silica support materials with acid and base catalytic groups. Solid acid, solid base and bifunctional solid acid/base catalysts were studied. Evidence for acid-base cooperative catalytic mechanisms was found, suggesting that these bifunctional catalysts could show significant advantages over singly functionalized materials of mixtures thereof. Silicas functionalized with tethered aminopropyl groups were prepared by both a grafting method and a

APA, Harvard, Vancouver, ISO, and other styles

34

Woltz, Christian. "Kinetic studies on alkane hydroisomerization over bifunctional catalysts." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=978158458.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Lishchynskyi, Anton. "Development of new methods for the asymmetric formation of C-N bonds." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAF026.

Full text

Abstract:

Au cours de ce travail de nouvelles méthodes pour la formation de liaison C-N ont été développées. Dans la première partie de cette thèse une application de catalyse métal-ligand bifonctionnelle pour la réaction énantiosélective aza-Michael est démontrée. Dans la deuxième partie nous présentons le travail sur les cyclisations, en utilisant des alcaloïdes du quinquina facilement disponibles, comme catalyseurs des plus prometteurs, fournissant des β-amino-acides d’indoline avec jusqu'à 98% ee. Parmi eux, l’hydroquinidine ressort du lot comme étant le catalyseur donnant le meilleur excès énatiomé

APA, Harvard, Vancouver, ISO, and other styles

36

ichard, Lloyd Richard Lloyd. "Investigations into the utility of aminoboronates as bifunctional catalysts." Thesis, Durham University, 2006. http://etheses.dur.ac.uk/2936/.

Full text

Abstract:

This project has been concerned with identification and refinement of any bifunctional catalytic properties of arylaminoboronic acids and derivatives Stage one of the project was directed towards the design, synthesis and structural understanding of several series of novel and interesting bifunctional boranie acids and derivatives, including the N,N-dialkylbenzylamine-2-boronic acid series and the 1֊-dimethylaminonaphthene-8-boronic acid series, stage two involved the high-throughput testing of potential catalysts. Direct amide formation (i.e. directly from carboxylic acid and amine) was ident

APA, Harvard, Vancouver, ISO, and other styles

37

Mocquet, CeÌcile Magaly. "New bifunctional catalysts for the asymmetric Morita-Baylis-Hillman reaction." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418232.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Aelvoet, Karel. "Research of bifunctional catalysts for C-C bond forming reactions." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2379/.

Full text

Abstract:

Bifunctional catalysis is a well understood phenomenon in nature, with enzymes frequently using two (or more) functional groups to accomplish selective transformations on a suitable substrate. It is becoming clear however, that bifunctional catalysis is not merely of interest to explain or mimic biological efficiency and rate enhancement, but is a viable design principle for the development of new molecular catalysts. In this thesis we have prepared achiral amino-boronic acid compounds with different scaffold structures based on general structures 1 and 2.(^5). although these compounds did not

APA, Harvard, Vancouver, ISO, and other styles

39

Schiavoni, M. L. "BIFUNCTIONAL NANOCOMPOSITE MATERIALS AS LONG-LIFE CATALYSTS FOR BIOMASS VALORIZATION." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/244734.

Full text

Abstract:

Phosphorylated mesoporous carbons (PMCs) were investigated as catalysts in the dehydration of fructose to hydroxymethylfurfural (HMF). The acidic PMCs show better selectivity to HMF compared to sulfonated carbon catalyst (SC) despite lower activity. The concentration of P–O groups on the PMC was correlated with the activity/selectivity of the catalysts; the higher the P–O concentration, the higher the activity. However, the higher the P–O content, the lower the selectivity to HMF. Indeed, a lower concentration of the P–O groups minimized the degradation of HMF to levulinic acid and the formati

APA, Harvard, Vancouver, ISO, and other styles

40

Thavornprasert, Kaew-arpha. "Production of acetals from bio-resourced alcohols over bifunctional catalysts." Electronic Thesis or Diss., Lille 1, 2013. http://www.theses.fr/2013LIL10016.

Full text

Abstract:

La biomasse est une matière première renouvelable pour un large éventail de produits chimiques à haute valeur ajoutée, comme les carburants. Les acétals, tels que le diméthoxyméthane (DMM) et le diethoxyéthane (DEE), peuvent être ainsi produits à partir respectivement du méthanol et de l'éthanol. Cette étude concerne la synthèse des acétals via une conversion directe de l'alcool. La synthèse en DMM est étudiée sur un catalyseur oxyde mixte FeMo faisant intervenir les fonctions d'oxydo-réduction et acide. 50% de rendement en DMM est obtenu à 255 °C sur le catalyseur comportant un rapport Mo/Fe

APA, Harvard, Vancouver, ISO, and other styles

41

Barreto, Rubens Santos. "Efeito da concentração de irídio sobre as propriedades de catalisadores do tipo Pt-Ge-Ir/Al2O3." Programa de Pós-Graduação em Química da UFBA, 2008. http://www.repositorio.ufba.br/ri/handle/ri/10012.

Full text

Abstract:

Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2013-04-23T13:34:03Z No. of bitstreams: 1 Rubens Barreto.pdf: 1566824 bytes, checksum: a78825b9f4c5548178c44817e0bf8aba (MD5)<br>Made available in DSpace on 2013-04-23T13:34:03Z (GMT). No. of bitstreams: 1 Rubens Barreto.pdf: 1566824 bytes, checksum: a78825b9f4c5548178c44817e0bf8aba (MD5) Previous issue date: 2008<br>Neste trabalho, foi estudado o efeito do conteúdo de irídio na atividade, seletividade e estabilidade de catalisadores de platina, irídio e germânio suportados em alumina, destinados à reforma catalítica de nafta de pet

APA, Harvard, Vancouver, ISO, and other styles

42

Ogura, Masaru. "Selective catalytic reduction of nitric oxide with methane on bifunctional zeolite catalysts = Metan kangenzai o mochiita issanka chisso no sentakuteki kangen hanno /." Electronic version of summary, 1998. http://www.wul.waseda.ac.jp/gakui/gaiyo/2547.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Strossi, Pedrolo Débora Regina. "Synthesis of metal-zeolite composite materials for bifunctional catalytic reactions." Thesis, Université de Lille (2018-2021), 2021. https://pepite-depot.univ-lille.fr/LIBRE/EDSMRE/2021/2021LILUR065.pdf.

Full text

Abstract:

Les catalyseurs à base de zéolite ont été largement utilisés dans la conversion de la biomasse. Les rendements catalytiques des produits recherchés sont fortement limités en raison de la taille relativement petite des pores dans les zéolithes et la préparation du catalyseur par imprégnation conduit généralement à des nanoparticules métalliques relativement grosses et à un faible contact entre les sites métalliques et acides. Le but de ce travail est la conception de catalyseurs nanocomposites métal-zéolithe contenant des nanoparticules de ruthénium uniformément réparties dans les zéolithes hié

APA, Harvard, Vancouver, ISO, and other styles

44

Alotaibi, A. A. "Alkylation of benzene and toluene with propane over bifunctional metal-acid catalysts." Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3018561/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Wong, Kae Shin. "Benzene alkylation with ethane into ethylbenzene over Pt-containing zeolite bifunctional catalysts." Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512307.

Full text

Abstract:

Ethylbenzene (EB) is currently produced via acid catalyzed benzene alkylation with ethene, which is a product of highly endothermic and energy intensive processes. The new reaction, which uses ethane for benzene alkylation, instead of ethene, would eliminate the ethene production step, thus, leading to the commercial and environmental benefits in the EB manufacturing. Benzene alkylation with ethane into EB can be achieved using bifunctional zeolite catalysts, which combine ethane dehydrogenation into ethene over metal sites with benzene alkylation by ethene over BrÃ¸nsted acid sites. The benze

APA, Harvard, Vancouver, ISO, and other styles

46

Tapia, Reche Mariano. "Bifunctional niobia and zirconia catalysts for 5-hydroxymethylfurfural production from C6 sugars." Thesis, Aston University, 2017. http://publications.aston.ac.uk/33426/.

Full text

Abstract:

Biomass represents one of the most practical and environmentally friendly options available as an alternative to petroleum derived compounds. Amongst them, 5-hydroxymethylfurfural (HMF) stands as a potential platform chemical for the production of biofuels and other value added chemicals. Although HMF can be selectively produced from mono- and poly-saccharides with the assistance of organic solvents or ionic liquids, its formation in aqueous media under mild conditions remains a challenge due to undesired side reactions. In this thesis, the conversion of glucose and fructose to HMF has been st

APA, Harvard, Vancouver, ISO, and other styles

47

Bibi, Ahtaram [Verfasser]. "Primary Amine Containing Bifunctional Catalysts for Asymmetric Aldol and Mannich Reactions / Ahtaram Bibi." Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2012. http://d-nb.info/1035220229/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Streuff, Jan. "Bifunctional N-H activation and oxidative transition metal catalysed diamination of alkenes." Université Louis Pasteur (Strasbourg) (1971-2008), 2008. http://www.theses.fr/2008STR13011.

Full text

Abstract:

Cette thèse traite de l'activation de liaisons N-H ainsi que du transfert catalytique d'atome d’azote vers des alcènes non-activés. Dans une première partie, l'activation des liaisons N-H par des métaux de transition du groupe VIII a été étudiée. Il a été démontré que les complexes de Ru, Rh et Ir basés sur les catalyseurs d'hydrogénation de transfert de Noyori activent la liaison N-H des amides avec une grande bande passante en acidité (Schéma 1). Ainsi, des complexes énantiomériquement purs d'acrylamide, benzamide et de divers sulfonamides ont pu être isolés. Ils présentent une grande stabil

APA, Harvard, Vancouver, ISO, and other styles

49

Alharbi, Khadijah Hamed. "Hydrodeoxygenation of bio-derived oxygenates over bifunctional metal-acid catalysts in the gas phase." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3008719/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Hosseini-Benhangi, Pooya. "Bifunctional oxygen reduction/evolution catalysts for rechargeable metal-air batteries and regenerative alkaline fuel cells." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/60227.

Full text

Abstract:

The electrocatalysis of oxygen reduction and evolution reactions (ORR and OER, respectively) on the same catalyst surface is among the long-standing challenges in electrochemistry with paramount significance for a variety of electrochemical systems including regenerative fuel cells and rechargeable metal-air batteries. Non-precious group metals (non-PGMs) and their oxides, such as manganese oxides, are the alternative cost-effective solutions for the next generation of high-performance bifunctional oxygen catalyst materials. Here, initial stage electrocatalytic activity and long-term durabilit

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!