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Dissertations / Theses on the topic 'PTC catalyst'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Zhang, Jiuqing. "Palladium-Imidazolium Carbene Catalyzed Heck Coupling Reactions and Synthesis of a Novel Class of Fluoroanthracenylmethyl PTC Catalysts." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1075.pdf.

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2

Dessal, Caroline. "Influence de l'atmosphère réactive sur la stabilité structurale de catalyseurs Pt1 supporté et performances associées en oxydation de CO et photogénération d'hydrogène." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1305/document.

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Ce travail de thèse a consisté en l’étude de catalyseurs ultradispersés, composés de clusters nanométriques ou d’atomes isolés (single-atom catalysts, SACs) de métal, une nouvelle classe de catalyseurs faisant actuellement l’objet d’un engouement mondial. Les systèmes Pt/?-Al2O3 et Pt/TiO2 ont été préparés, caractérisés et testés en oxydation de CO et photogénération d’hydrogène, respectivement. Plusieurs méthodes d’imprégnation et de traitement thermique ont été comparées, notamment grâce à l’analyse de la dispersion du platine par microscopie électronique en transmission à balayage (STEM). P

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3

Servin, Paul. "Dendrimères phosphorés & catalyse en milieu aqueux." Toulouse 3, 2007. http://www.theses.fr/2007TOU30128.

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A la fin des années 70, les premiers pionniers commencèrent à réaliser des réactions catalytiques en milieu aqueux. Leurs travaux furent remarqués mais ne suscitèrent pas un engouement général de la communauté scientifique. Aujourd'hui, un changement complet a eu lieu : dans le monde entier des équipes de recherche développent des réactions catalytiques en milieu bi- ou monophasique, hétérogène, homogène et toute autre combinaison possible avec l'eau comme solvant « mineur », « majeur » ou unique solvant. Une alternative à la méthode de synthèse généralement employée des dendrimères phosphorés

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4

Ramarou, Diteboho Selina. "Alkylated PTA platforms for mono- and polynuclear pre-catalysts for the aqueous biphasic hydroformylation of 1-octene." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29206.

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A series of mono-, di- and trimeric alkylated PTA ligands were synthesised. These ligands were reacted with the dimeric rhodium precursor, [RhCl(COD)]2, to produce the corresponding mono-, di- and trinuclear Rh(I)-PTA complexes. These complexes were then reacted with carbon monoxide to substitute the COD ligands with CO ligands, yielding the carbonyl analogues of the complexes. The ligands and complexes were fully characterised using various spectroscopic and analytical techniques, which include 1H, 13C and 31P NMR spectroscopy, FTIR spectroscopy, mass spectrometry, and elemental analysis. The

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5

Ben, Moussa Olfa. "Conception raisonnée de catalyseurs bifonctionnels : élaboration de catalyseurs Pt0/zéolithe-Alumine." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066700/document.

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Les catalyseurs bifonctionnels pour l’hydrocraquage nécessitent à la fois des sites acides de Brønsted et des sites métalliques. L’intimité entre sites acides et sites métalliques peut donc influer sur l’activité et la sélectivité de la réaction. Nous nous sommes proposés d’explorer l’effet de la distance sites métalliques-sites acides sur la conversion du n-heptane en concevant des catalyseurs à base de platine supportés sur des nanostructures alumine-zéolithe. Pour cela, nous avons étudié la synthèse de suspensions colloïdales nanométriques de zéolithes NaY (20 nm) beta (30 nm), ZSM-5 (50 nm

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6

PASQUALE, LEA. "Structural Evolution of PdCu and PtCu Nanocrystal Catalysts over Redox Treatments." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/973257.

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This thesis presents the main results on the synthesis of PdCu and PtCu bimetallic nanocrystals (NCs) and their application as catalysts for CO oxidation as a probe reaction. Focusing on Cu and keeping constant the NC size and the support material, the role of the noble metal in the alloy/dealloy/migration process of noble metal-Cu alloyed NCs was studied. The role of the support material in the same transformations was also objected of study. NCs with defined size and composition were successfully synthesized by means of colloidal synthesis methods. The NCs were further deposited on a SiO2 su

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7

Ben, Moussa Olfa. "Conception raisonnée de catalyseurs bifonctionnels : élaboration de catalyseurs Pt0/zéolithe-Alumine." Electronic Thesis or Diss., Paris 6, 2016. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2016PA066700.pdf.

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Les catalyseurs bifonctionnels pour l’hydrocraquage nécessitent à la fois des sites acides de Brønsted et des sites métalliques. L’intimité entre sites acides et sites métalliques peut donc influer sur l’activité et la sélectivité de la réaction. Nous nous sommes proposés d’explorer l’effet de la distance sites métalliques-sites acides sur la conversion du n-heptane en concevant des catalyseurs à base de platine supportés sur des nanostructures alumine-zéolithe. Pour cela, nous avons étudié la synthèse de suspensions colloïdales nanométriques de zéolithes NaY (20 nm) beta (30 nm), ZSM-5 (50 nm

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8

Wynn, Mélanie. "Synthèse de dioxyde de titane déposé sur des supports macro-poreux SiBC et SiBCN pour la photo-catalyse." Thesis, Valenciennes, 2017. http://www.theses.fr/2017VALE0029/document.

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La photo-catalyse est une voie très prisée pour la dépollution de l’eau ou de l’air. Le photo-catalyseur le plus employé est le dioxyde de titane (TiO2) mais l’activité photo-catalytique peut fortement varier d’une poudre à l’autre. De plus, il est très avantageux, voire nécessaire, de le déposer sur un support, pour une manipulation aisée, notamment s’il s’agit d’un monolithe poreux. Le but de cette thèse, menée en collaboration entre le LMCPA et l’IEM, est de produire un photo-catalyseur supporté : une mousse céramique, issue de précurseurs céramiques polymériques (voie PDC), revêtue de TiO2

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9

Hicken, Erik J. "Total Syntheses of (+)-Geldanamycin, (-)-Ragaglitazar, and (+)-Kurasoin A and Phase-Transfer-Catalyzed Asymmetric Alkylation." BYU ScholarsArchive, 2005. https://scholarsarchive.byu.edu/etd/801.

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Geldanamycin possesses various biological activities as seen in the NCI 60 cell line panel (13 nM avg., 70 nM SKBr-3 cells). The predominant mode of action providing these unique results arises from the ability of geldanamycin (GA) to bind to the chaperone heat shock protein 90 (Hsp90). Despite its complicated functionality, the first total synthesis of GA was accomplished, which included two new reactions developed specifically to address the stereochemical features. The final step in the synthesis of GA was a demethylation-oxidation sequence to generate the desired para-quinone. This step co

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10

Berkner, Joachim Ernst. "Synthesis and characterization of new organic electrically conducting polymers : part II: Direct carboxylation of sulfolene : part III: Effect of water on PTC systems : part IV: Mechanism of Phase transfer catalytic N-alkylation reactions." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/30715.

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11

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/.

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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

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12

Coutinho, José William Diniz. "Estudo Eletroquímico de Catalisadores de Pt-Mo e Pt-Cd para a Oxidação Eletroquímica de Etileno Glicol para a possível Aplicação em Células a Combustível Diretas a Álcool." Universidade Federal do Maranhão, 2017. http://tedebc.ufma.br:8080/jspui/handle/tede/1365.

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Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-05-10T17:56:20Z No. of bitstreams: 1 JoseCoutinho.pdf: 2076269 bytes, checksum: f50c622c02cff2de6c220fbd2cf046e2 (MD5)<br>Made available in DSpace on 2017-05-10T17:56:20Z (GMT). No. of bitstreams: 1 JoseCoutinho.pdf: 2076269 bytes, checksum: f50c622c02cff2de6c220fbd2cf046e2 (MD5) Previous issue date: 2017-03-13<br>The electrooxidation of ethylene glycol and its partial oxidation products was studied in platinum-containing electrocatalysts supported on high surface carbon Vulcan XC-72, molybdenum and cadmium (90:10, 80:20, 70:30) in

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13

Höjer, Pontus. "Photoelectrochemical Water-Splitting using 3C-SiC." Thesis, Linköpings universitet, Halvledarmaterial, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-139761.

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In 1972 Fujishima and Honda conceptualised a photoelectrochemical cell for hydrogen generation via PEC water splitting. Hydrogen as a clean energy carrier provides environmentally friendly energy storage solutions or can fuel certain applications. This idea has since then been further built upon with new materials and combinations with the aim of improving efficiency. In this project n-type cubic silicon carbide thick layers were grown by a sublimation method and characterised for water splitting performance. A generated photo-current density of 0.45 mA/cm2 was measured with no bias between th

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14

Orfei, Elisabetta. "A step further toward the application of layered double hydroxides in Sustainable Catalysis: from artificial photosynthesis to wastewater treatment." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24403/.

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Layered-Double Hydroxides (LDHs) are known to be versatile materials that can be potentially applied in different fields. This work is focused on their specific application in artificial photosynthesis and wastewater treatment. Indeed, their catalytic properties make them possible candidates for photoelectrodes in photo-electrochemical cells (PEC), a recent technology exploited for solar fuel production, and Dye-Sensitised Solar Cells (DSSC), also known as third generation photovoltaics. Furthermore, the possibility to directly intercalate a dye in the LDH interlayer makes these materials able

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15

Ortiz, Cesar Gabriel. "Synthesis of 1,3,5-triaza-7-phosphaadamantane (PTA) and 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane (DAPTA) complexes and the development of chromium salen catalysts for the copolymerization of CO2 and epoxides." Texas A&M University, 2004. http://hdl.handle.net/1969.1/359.

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Two main areas are considered in this manuscript. The first describes the synthesis of group 10 metal complexes incorporating the water-soluble 1,3,5-triaza-7-phosphaadamantane (PTA) ligand and the second deals with the preparation of Cr(salen)X catalysts for the copolymerization of CO2 and epoxides. In the first topic, the synthesis of nickel(II) and palladium(II) salicylaldiminato complexes incorporating PTA has been achieved employing two preparative routes. Upon reacting the original ethylene polymerization catalyst developed by Grubbs and coworkers (Organometallics, 1998, 17, 3149), (sal

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16

You, Sheng Mu. "Metal organic frameworks as efficient photosensitizer for TiO₂ nanoarray anode and application to water splitting in PEC cells Fe/Ni Bimetallic organic framework deposited on TiO₂ nanotube array for enhancing higher and stable activity of oxygen evolution reaction Novel nano-architectured water splitting photoanodes based on TiO₂-nanorod mats surface sensitized by ZIF-67 coatings Surface sensitization of TiO₂ nanorod mats by electrodeposition of ZIF-67 for water photo-oxidation Electrochemically capacitive deionization of copper (II) using 3D hierarchically reduced graphene oxide architectures." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASF015.

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Les réserves de combustibles fossiles diminuent et leur utilisation illimitée depuis la révolution industrielle a généré de profonds changements du climat, notamment des cycles de la température atmosphérique. Stocker l'énergie solaire sous forme d'hydrogène produit par dissociation de l'eau est un moyen idéal pour combattre le réchauffement climatique. Les matériaux de la famille des «metal organic framework» (MOF) commencent à être utilisés comme photo-électrocatalyseurs, notamment pour la photo-dissociation de l'eau. Leur porosité extrêmement élevée et leur grande polyvalence, tant chimique

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17

Delmas, Jean-François. "Quelques propriétés des superprocessus." Phd thesis, Université Pierre et Marie Curie - Paris VI, 1997. http://tel.archives-ouvertes.fr/tel-00007575.

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Les superprocessus sont des processus de markov a valeurs mesures. Ils sont caracterises par un processus markovien sous-jacent et un mecanisme de branchement spatial. lorsque le mecanisme de branchement est restreint a un domaine de l'espace, appele ensemble de catalyse, on parle alors de superprocessus avec catalyse. Dans le premier chapitre nous rappelons la construction du super-mouvement brownien avec catalyse, puis nous etablissons des proprietes de continuite trajectorielle. Nous demontrons egalement que hors de l'ensemble de catalyse, le super-mouvement brownien possede une densite ale

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18

Chen, Wen-Ke, and 陳文科. "Phase Transfer Characteristics of PTC System with Tetrabutylphosphonium romide as Catalyst." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/23672593161127468125.

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碩士<br>國立成功大學<br>化學工程學系碩博士班<br>91<br>For an immiscible two-phase system, the chemical reactions occur only in the interface, hence the reaction rate is very slow and the yield is low. If phase-transfer catalyst (PTC) was added, it could transport the reactants between the water phase and the organic phase. It was found that the reaction rate could be greatly enhanced. In addition, phase-transfer catalysis has many merits such as small amounts of catalyst, mild conditions for the chemical reactions, greater reaction rate, higher yield and selectivity. Consequently, the researches of phase-transf

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19

Te-Hsin, Chang, and 張德興. "Phase Inversion Characteristics of a PTC system Containing PEG as the Catalyst." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/36631772161470037044.

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碩士<br>國立成功大學<br>化學工程學系<br>87<br>Since chemical reactions occur only on the oil-water interface for the two immiscible liquid phase system , the reaction rate obtained is very slow. Phase transfer catalyst (PTC) which can transfer between the oil-phase and the water-phase, was commonly used to solve the above problem. Due to its lower price , the application of PEG as a phase transfer catalyst is of great potential in the industries. The PTC system contains two immiscible liquid phase,hence the stability of the system , i.e. the characteristics of phase inversion,is an important fact

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20

Mukri, Bhaskar Devu. "Synthesis, Structure and Catalytic Properties of Pd2+, Pt2+ and Pt4+ Ion Substituted TiO2." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3346.

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After introducing fundamentals of catalysis with noble metal surfaces especially Pt metal for CO oxidation and subsequent developments on nano-crystalline Pt metals supported on oxide supports, an idea of Pt ion in reducible oxide supports acting as adsorption sites is proposed in chapter 1. Idea of red-ox cycling of an ion in an oxide matrix is presented taking Cu ion in YBa2Cu3O7 as an example. Noble metal ions in reducible oxides such as CeO2 or TiO2 acting as adsorption sites and hence a red-ox catalyst was arrived at from chemical considerations. Among several reducible oxide supports, Ti

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21

Mukri, Bhaskar Devu. "Synthesis, Structure and Catalytic Properties of Pd2+, Pt2+ and Pt4+ Ion Substituted TiO2." Thesis, 2013. http://etd.iisc.ernet.in/2005/3346.

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After introducing fundamentals of catalysis with noble metal surfaces especially Pt metal for CO oxidation and subsequent developments on nano-crystalline Pt metals supported on oxide supports, an idea of Pt ion in reducible oxide supports acting as adsorption sites is proposed in chapter 1. Idea of red-ox cycling of an ion in an oxide matrix is presented taking Cu ion in YBa2Cu3O7 as an example. Noble metal ions in reducible oxides such as CeO2 or TiO2 acting as adsorption sites and hence a red-ox catalyst was arrived at from chemical considerations. Among several reducible oxide supports, Ti

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22

Huang, Ching-Lung, and 黃慶隆. "The study on the recovery of cobalt and manganese from spent oxidation PTA catalyst by chemical preecipitation method." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/37516863404608787878.

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碩士<br>弘光科技大學<br>環境工程研究所<br>102<br>This study was investigated to recover cobalt and manganese from spent oxidation PTA catalyst by chemical precipitation method. In manufacturing process of PTA in chemical industry, the oxidation of PTA catalyst possess several properties such as great amount usages and high-polluted nature. Firstly, sodium hydroxide or sodium carbonate was added to the wastewater of the oxidation PTA catalyst (i.e. chemical precipitation). Then, the membrane filtration was applied to recover cobalt and manganese from spent oxidation of PTA catalyst in this study. It is not o

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23

Bogusiak, Jadwiga. "Badania nad syntezą tiocukrów w katalitycznym układzie dwufazowym." Rozprawa doktorska, 1986. https://repolis.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=3704.

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24

Bogusiak, Jadwiga. "Badania nad syntezą tiocukrów w katalitycznym układzie dwufazowym." Rozprawa doktorska, 1986. https://delibra.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=3704.

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25

Trinh, Nguyen Trieu. "Small molecule inhibitors of the hedgehog signalling pathway as cancer suppressing agents." Thesis, 2016. http://hdl.handle.net/1959.13/1337980.

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Research Doctorate - Doctor of Philosophy (PhD)<br>The HSP plays a pivotal role in the spatial and temporal regulation of cell proliferation and differentiation. Conversely aberrant Hh signalling is involved in Gorlin syndrome, basal cell carcinoma (the most common cancer in the world), and more than one third of all human medulloblastoma cases. In all of these cases, it is believed that deregulated Hh signalling leads to increased cell proliferation and tumour formation. Inhibition of the Hedgehog Signalling Pathway, is a recently validated anti-cancer drug target, with vismodegib (GDC-0449,

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