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Sahin, Nihat Ege. "Réduction électrochimique du dioxyde de carbone sur des électrocatalyseurs à base de cuivre". Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2313/document.
Pełny tekst źródłaThe anthropogenic emissions of carbon dioxide (CO2) are the major cause of global warming. The selective CO2 reduction reaction (CO2RR) of has been proposed as a promising, convenient and efficient method for sustainable energy conversion systems. The reduction of CO2 to energetically valuable products requires the use of an appropriate electrode material. This study focuses on the preparation of Cu-based electrocatalysts supported on different types of carbon materials such as Vulcan XC-72R, mesoporous carbon CMK-3, mesoporous carbon FDU-15 and tannin based mesoporous carbon IS2M for the CO2RR under mild conditions. Besides, Vulcan XC-72R carbon supported bimetallic copper/palladium alloy materials were prepared for increasing the Faradaic yield. These copper-based catalysts were electrochemically characterized and preparative electrolyses set at constant potential were carried out in order to investigate the reduction products distribution and Faradaic yields as a function of the applied potential and catalyst loading. Chemicals such as HCOOH, CO and H2 issued from the CO2RR, were determined with in-situ and ex-situ complementary (electro)analytical and spectroscopic techniques. The significant difference in the product distribution is probably due to the ensemble (geometry and ligand) effects in the bimetallic CuPd materials, and textural structure of the supporting substrates. Selective CO2 to-HCOOH conversion has been successfully undertaken on Cu50Pd50/C with 62 % Faradaic efficiency
Beliaeva, Kristina. "Captage et conversion électrochimique du CO2 dans des liquides ioniques et des solvants eutectiques profonds avec des catalyseurs à base de Pd". Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI094.
Pełny tekst źródłaCarbon dioxide capture and utilization (CCU) is a way to decarbonize industrial sector. This technology provides a valorization of cheap carbon feedstock by its transformation to carbonaceous value-added chemicals. Multiple CO2 capture and utilization techniques exist to prevent the release of the greenhouse gas to the atmosphere. Here, we propose an integrated process of CO2 capture sequenced by electroconversion to C-based products in electrochemical cell. Electrochemical CO2 conversion is a promising method due to mild reaction conditions and possibility to power the reaction with electricity produced by renewable energy sources. This process necessitates the development of solvents capable to capture CO2 and to play a role of electrolyte during electrochemical reduction reaction. At the same time, efficient catalytic materials are vital for selective CO2 conversion to targeted product(s). The choice of capture solvent is usually based on CO2 capture ability, chemical and electrochemical stabilities, environmental issue and cost. Economically affordable deep eutectic solvent (DES) electrolytes seem to be promising candidates for CO2 capture and electroreduction because of good thermal and electrochemical stabilities, competitive CO2 uptake and large electrochemical windows. In this work, we focused on the development of novel deep eutectic solvent electrolytes for CO2 electroreduction with Pd-based electrocatalysts. Palladium proved its efficiency for selective conversion of carbon dioxide to C1 molecules such as carbon monoxide.During the thesis, we synthesized and electrochemically tested multiple DESs and Pd-based electrocatalysts with different morphologies and particle sizes to get more insights into reaction mechanism of CO2 electroreduction to C1 molecules. The implementation of different characterization techniques helped to study catalytic materials and DESs structures, to analyze gaseous and liquid reaction intermediates and products, and to understand main challenges of the studied system. Overall, this study is a one step forward the application of CO2ER (carbon dioxide electrochemical reduction) for valorisation of carbon dioxide and climate change mitigation
Evrard, David. "Complexes bi- et polymétalliques à base de palladium : synthèse, électrosynthèse et applications en catalyse". Thèse, Université de Sherbrooke, 2003. http://savoirs.usherbrooke.ca/handle/11143/5032.
Pełny tekst źródłaCavoué, Thomas. "Électrocatalyseur à base d'argent pour la promotion électrochimique de la catalyse". Thesis, Lyon, 2020. https://n2t.net/ark:/47881/m6639p43.
Pełny tekst źródłaThe ethylene oxide (EO) is an essential building block for chemistry industry. It is produced by the ethylene epoxidation reaction over a silver-based catalyst. However, to achieve high selectivity, the industrial process uses chloride additives in the gas phase and alkaline moderators on the catalyst. The aim of this work is to develop a new environmentally-friendly route without using chloride compounds by using the concept of the Electrochemical Promotion of Catalysis (EPOC). This phenomenon allows to force, by applying small polarizations, the migration of ionic species contained in a solid electrolyte onto the catalyst surface and to in-situ modify its catalytic properties. Various Ag based catalytic coating have been deposited on dense membranes of Yttria Stabilized Zirconia (YSZ), an O2- ionic conductor. The pure silver films have shown a very poor activity toward the ethylene epoxidation but interesting properties for propene combustion in oxidative conditions, thanks to the EPOC phenomenon. To counteract the low activity of the pure silver films, composites coatings between Ag and YSZ have been synthetized in order to increase the porosity and the interface Ag/YSZ. These Ag/YSZ composite electrocatalysts achieved EO selectivity EO higher than 50%, without any promoter and under atmospheric pressure at 300°C, results never reported in the literature. However, this selective state can be maintained only for a few hours. In-situ observations by using an environmental transmission electron microscope have demonstrated the formation, under the reaction mixture, of small Ag2O clusters on the YSZ crystallites surface via a mechanism of evaporation/condensation. However, these very selective small nanoparticles (< 1 nm), quickly sinter at 300°C and lose their EO selectivity in favor of the CO2 production
McConachie, Laura K. "Novel base and palladium-mediated preparations of sulfur heterocycles". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0028/MQ51081.pdf.
Pełny tekst źródłaDuplan, Jean-Luc. "Catalyseurs de post-combustion automobile à base de palladium". Lyon 1, 1991. http://www.theses.fr/1991LYO10091.
Pełny tekst źródłaSouffache, Blaise. "Étude comparative des propriétés de transport et des propriétés magnétiques d'alliages à base de Palladium et Palladium hydrogéné". Paris 11, 1986. http://www.theses.fr/1986PA112093.
Pełny tekst źródłaThis thesis describes a gentle method for the hydrogenation of Palladium and its alloys, thanks to which concentrations x for PdHx compounds’ close to 1 have been obtained. The variations of the residual resistivity during the hydrogenation are explained using an average medium model for the two phase domain (x < 0. 65) and by a local diffusion model for the single phase region (x>0. 65). The study of the phonon resistivity of the compound PdH shows the presence of an optical phonon branch well separated from the acoustic phonon branch, which is responsible for the superconductivity in this compound. The study of the magnetic interactions in alloys containing Iron, Cobalt or Manganese shows that these are two types of coupling between the local moments, depending on the concentration. At law concentrations the coupling is oscillating and long distance (Friedel-Blandin) and we show that it is due to s-like conduction electrons. At high concentrations the coupling is short range and due to d electrons. These results provide a further illustration of the spectacular variations in electronic structure obtained by hydrogenation of Palladium
Souffache, Blaise. "Etude comparative des propriétés de transport et des propriétés magnétiques d'alliages à base de palladium et palladium hydrogéné". Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb376013175.
Pełny tekst źródłaKellali, Boujemâa. "Modification de catalyseurs à base de palladium en post-combustion automobile". Poitiers, 1994. http://www.theses.fr/1994POIT2308.
Pełny tekst źródłaHornez, Jean-Christophe. "Évaluation physico-chimique et biologique d'alliages dentaires à base de palladium". Lille 1, 1999. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1999/50376-1999-133.pdf.
Pełny tekst źródłaLemaire, Anne. "Palladium et palladium modifié substituts des catalyseurs à base de rhodium dans la post-combustion automobile (moteurs à essence)". Lyon 1, 1995. http://www.theses.fr/1995LYO10091.
Pełny tekst źródłaParent, Loic. "Synthèse et caractérisation de nanoparticules métalliques hybrides à base de polyoxométallates : applications à l'électro-catalyse". Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLV010/document.
Pełny tekst źródłaPolyoxometalates (POMs) are known for their high diversification in terms of architectures and applications. POMs are used in this work for the synthesis of palladium nanoparticles since they act both as a reducer of metallic cation and as surfactant of nanoparticles.At first, we studied the electrochemical properties of several POMs belonging in the same family, then among this family, we chose to use two particular POMs to synthesize palladium nanoparticles. From an average size between 15 and 20 nm, these nanoparticles have been fully characterized and are stable over a month.Finally, various hybrid materials based on palladium and/or copper have been characterized by electrochemistry in solid state and their catalytic capacity towards the reduction of nitrate ions and dioxygene has been assessed
Ksar, Faycal. "Synthèse de nouvelles nanostructures à base de palladium : application en électro-catalyse". Paris 11, 2010. http://www.theses.fr/2010PA112213.
Pełny tekst źródłaThree-dimensional connected Pd nanowires forming nanoballs have been synthesized by slow reduction of Pd(II) in hexagonal mesophases made by a quaternary system (water/cyclohexane/surfactant/cosurfactant). Both confinement and slow reduction are necessary to obtain these new nanostructures. Palladium nanowires (of length a few tens of nanometers) are synthesized in a hexagonal mesophase formed by a quaternary system (Pd-doped water, surfactant, cosurfactant, and oil) by electron beam irradiation. The mesophases can be doped by high concentrations of palladium (0. 1 M) without any disturbance of the structure of the mesophases which allows the quantitative synthesis of 1D Pd nanostructures. We found an increase in the average length of the nanowires with the amount of cosurfactant (pentanol) that assists the reduction/growth processes. Bimetallic Pd-Au nanostructures were synthesized in the soft templates provided by surfactant hexagonal mesophases. The nanostructures are constituted by a core rich in gold and a Pd porous shell. The electrocatalytic activity of these nanostructures for ethanol oxidation in basic medium was compared with that of alloyed Pd-Au nanoparticles synthesized in solution. The Pd-Au alloy is active toward the oxidation of ethanol in an alkaline medium but is not durable in realizing this process. The electrocatalytic oxidation of ethanol was selected as a test reaction in alkaline medium where Pd is known to be among the best electrode materials
M'BARKI, MOHAMED AMINE. "Contribution electrochimique a l'etude de systemes catalytiques a base de palladium zerovalent". Paris 6, 1992. http://www.theses.fr/1992PA066248.
Pełny tekst źródłaBarbosa, Danns Pereira. "Réduction des espèces nitrates dans l'eau sur catalyseurs bimétalliques à base de palladium". Poitiers, 2011. http://nuxeo.edel.univ-poitiers.fr/nuxeo/site/esupversions/43b1aae9-2727-4562-82e4-40037ff215da.
Pełny tekst źródłaThe large use of nitrogen fertilizers, as well as the rudimentary sanitation systems and the livestock activities, has increased the contamination of groundwater and thus of potable water. Due to the serious health risks of nitrate species for human healthy, the technologies available for removing them from water have been received increasing attention in recent year. Therefore, bimetallic catalysts based on palladium and tin or indium supported on sulfonated styrene-divinylbenzene (Sty-DVB) were prepared by two methods : successive impregnation and catalytic reduction. Catalysts with 5% w/w of palladium and several amounts (05,2 znd 4% w/w) of tin or indium were obtained evaluated in the reduction of nitrate species in water in the presence and in the absence of carbon dioxide. The indium-based catalysts were more active in the reduction of nitrate species and less selective to nitrogen than the tin-based ones. In addition, for the tin-based samples the catalytic reduction method led to more active catalysts than the successive impregnations one. An opposite behavior was noted for indium-containing catalysts. For most samples, carbon dioxide improved the activity, decreased the nitrite selectivity and increased the production of ammonium species. The best performance was shown by the 5%Pd2%Sn/Sty-DVB (activity = 15,2 µmol. Min⁻¹g⁻¹, nitrogen selectivity = 98%) and 5%Pd0,5%In/Sty-DVB (activity = 18,8 µmol. Min⁻¹g⁻¹, nitrogen selectivity = 89 %) samples, prepared by successive impregnations and catalytic reduction, respectively
MOTTIER, LOIC. "Etudes cinetiques et electrochimiques de systemes catalytiques a base de complexes du palladium". Paris 7, 1995. http://www.theses.fr/1995PA077234.
Pełny tekst źródłaShaffer, Andrew R. "Synthesis, Reactivity, and Catalysis of 3-Iminophosphine Palladium Complexes". University of Toledo / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1248288981.
Pełny tekst źródłaGorugantula, Sobha Priyadarshini. "Syntheses of fused pyrroloheterocycles, isatins, approach towards the indole fragment of nosiheptide and a base-mediated formation of 3-hydroxycarbazoles". Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10483.
Pełny tekst źródłaTitle from document title page. Document formatted into pages; contains xx, 242 p. : ill. Includes abstract. Includes bibliographical references (p. 137-145).
Harivololona, Rondronirina. "Catalyseurs de post-combustion automobile à base de palladium déposé sur des aérogels d'oxydes". Lyon 1, 1994. http://www.theses.fr/1994LYO10320.
Pełny tekst źródłaEvrard, David. "Complexes bi- et polymétalliques à base de palladium : synthèse, électrosynthèse et applications en catalyse". Sherbrooke : Université de Sherbrooke, 2003.
Znajdź pełny tekst źródłaGantassi, Oussama. "Etude théorique des nanoparticules à base de Palladium pour la réaction d’hydrogénation sélective des alcynes". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2016. http://www.theses.fr/2016ENCM0013/document.
Pełny tekst źródłaThe catalysts based on Pd nanoparticles are widely used in the olefin purification industry. This allows to hydrogenate the by-products of the reaction such as acetylene (C2H2), which can poison and deactivate the catalyst. Although Pd-based catalysts are very active for the hydrogenation reaction, they have a low selectivity. Thus, acetylene and ethylene (which are unsaturated hydrocarbons) interacting with the Pd-catalysts may be hydrogenated to ethane (C2H6), which is a toxic product. Considerable effort is devoted to improve the selectivity of catalysts based on Pd. The present thesis is within this framework. It describes at the molecular level the active sites of Pd-model catalysts and identifies the reaction mechanisms. The goal is to understand how the intrinsic properties of Pd catalyst vary with different size and shape, oxide supports and incorporation of metal additives, in order to improve their selectivity. The hydrogenation of ethylene to acetylene is studied as a prototype reaction. To achieve the goal, periodic Density Functional Theory approach, as implemented in the VASP code, was applied to several Pd-catalysts models. These models include nanoparticles of few atoms (Pdn, n=1,..,7, 13, and 55) and semi-infinite Pd surface (111). They were used to study the effect of the shape and size on the magnetic and electronic properties, and their influence on the reaction pathways. The first step in the reaction mechanism is the adsorption of C2H2 and C2H4. Therefore, the adsorption mechanism was also examined for various magnetic isomers of Pdn structures. Because in the real conditions, the catalysts are often stabilized on TiO2 oxide supports, the surface of the latter was considered in our models. Thus, the electronic properties and reactivity of free and supported Pd-nanoparticles could be compared to reveal the effect of the support. Finally, in order to improve the selectivity of Pd, and predict an effective catalyst, transition metals additives (M = Au, Ag, Cu, Co, Ni, Fe etc...) have been considered. Indeed, building on the synergies that can occur for bimetallic couples through changes in electron densities, it was possible to predict combinations of metals (PdM) whose electronic properties are different from those of their monometalic counterpart. The study of reaction pathways and identification of activation barriers suggest that Pd-Fe and Pd-Co systems are the best candidates
Bachir, Redouane. "Modification de catalyseurs d'hydrogénation à base de palladium par dépôt de fer en sous-tension". Poitiers, 1995. http://www.theses.fr/1995POIT2316.
Pełny tekst źródłaCadieu, Marie-Claude. "Reactions de contact des octanes sur des catalyseurs a base de platine et de palladium". Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13023.
Pełny tekst źródłaLabidi, Ahmed. "Etude de capteurs de gaz à base d'oxyde de tungstène (WO3) par spectroscopie d'impédance". Aix-Marseille 3, 2006. http://www.theses.fr/2006AIX30025.
Pełny tekst źródłaThe aim of this work is the determination of detection mechanism for WQ3 based sensors by impedance spectroscopy, under reducing (ethanol and acetone) or oxidizing (ozone) gases. This technique is a powerful method for understanding the conduction processes and the solid/gaz interaction mechanisms of these sensors kind. The studied WOa sensitive thin layers were deposited at the laboratory by reactive radio-frequency magnetron sputtering and vacuum evaporation. These techniques permit to prepare homogeneous and polycrystalline thin layers. The morphological properties were studies by atomic force microscopy (AFM). The impedance investigation showed that the sensors interaction with ozone and organic vapors depends on the W03 sensitive layer morphology in particular of their density of grain boundaries. We have also analyzed by impedance spectroscopy the response under ozone and ethanol of W03 based sensors wherein the film surface was modified by gold (Au) or palladium (Pd) metal additive. The results of these studies showed that the Au addition improves slightly the sensitivity of the sensors toward ethanol, for the films of WO3 obtained by sputtering or evaporation. Under ozone, the Au addition seems to be able to improve the sensitivity of WC3 sensors film prepared by evaporation. For instance, the sensors became practically insensitive toward the two used gases when Pd is added. The results of this work make it possible to determine the principal morphological parameters to take into accounts for the improvement of the WO3 based sensors responses
Cadieu, Marie-Claude. "Etude des réactions de contact des octanes sur catalyseurs à base de platine et de palladium". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37612354t.
Pełny tekst źródłaDebauge, Yves. "Alliages à base de palladium PdX (avec X = Fe, Cu) : caractérisation de surface et réactivité pour les réactions de dépollution et d'hydrogénation". Lyon 1, 1995. http://www.theses.fr/1995LYO10273.
Pełny tekst źródłaLoffreda, David. "Modélisation théorique de l'adsorption et de la réactivité de la molécule NO sur les surfaces de catalyseurs à base de palladium, de rhodium et d'alliages palladium-manganèse". Lyon 1, 1999. http://www.theses.fr/1999LYO10295.
Pełny tekst źródłaRamirez-Meneses, Esther. "Synthèse et caractérisation de nanoparticules métalliques à base de rodhium, platine et palladium, stabilisés par des ligands". Toulouse 3, 2004. http://www.theses.fr/2004TOU30140.
Pełny tekst źródłaOuchaou, Kahina. "Catalyseurs hétérogènes à base de polysaccharides pour des réactions pallado-catalysées". Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112221.
Pełny tekst źródłaThis work describes the preparation, screening and use of heterogeneous catalysts based on polysaccharides. The main goal of our project was to evaluate two polysaccharides: alginates and chitosan as renewable supports for heterogeneous catalysis.Alginates are known to form gels with most di- and multivalent cations due to the presence of the carboxylate functions of their matrix. And chitosan is an attractive polysaccharide for application in catalysis owing to the presence of readily functionalizable amino group and its insolubility in organic solvents.First, our work focused on evaluating the catalytic activity of bimetallic Mn+-Pd catalysts supported on alginate in C—C coupling reactions. Among them, one system demonstrated remarkable catalytic properties for the Suzuki-Miyaura coupling. Then, the oxidation of alcohols catalyzed by Alginate-Mn+-Pd2+ catalyst was investigated. Two catalysts demonstrated good activity for oxidation of benzylic and allylic alcohol.In a second time, we developed new NHC ligands in order to anchor them on chitosan: two new NHC ligands for olefin metathesis and several NHC pincer CNC ligands for C—C coupling reactions in water. A palladium complex obtained with one our new ligand bearing long alkyl chains showed good activity in the Suzuki-Miyaura coupling in pure water.Finally, a new palladium (II) catalyzed decarboxylative cyanation reaction was investigated. This methodology is the first example of direct conversion of aryl carboxylic acid into the corresponding aryl nitrile. This reaction is well adapted to labeled compound synthesis
Laurent, Pierre. "Approche moléculaire du design et de la synthèse de nanoparticules supportées et non-supportées à base de Pt et Pd". Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00980065.
Pełny tekst źródłaRoquemaure, Corine. "Comportement de doubles liaisons exométhyléniques vis à vis de catalyseurs à base de palladium II (type Wacker)". Aix-Marseille 3, 1987. http://www.theses.fr/1987AIX30047.
Pełny tekst źródłaHoyos, Marin Luis Javier. "Résistance aux poisons soufrés de catalyseurs à base de palladium en milieu oxydant et en milieu réducteur". Lyon 1, 1993. http://www.theses.fr/1993LYO10173.
Pełny tekst źródłaNguyen, Thanh Binh. "Oxydation totale du chlorobenzène et du trichloroéthylène sur catalyseurs à base de palladium déposé sur supports oxyde". Lille 1, 2006. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/c02f619b-2dbd-46f6-981b-89b966c13f55.
Pełny tekst źródłaRoquemaure, Corine. "Comportement de doubles liaisons exométhyléniques vis à vis de catalyseurs à base de palladium II (type Wacker)". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376094688.
Pełny tekst źródłaAbdul, Malik. "Etude du greffage d'enzymes sur des supports inorganiques en oxyde de nickel et oxydes de silicium. Réalisation d'un capteur enzymatique à base d'une électrode palladium/oxyde de palladium". Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1988. http://tel.archives-ouvertes.fr/tel-01069979.
Pełny tekst źródłaAbdul, Malik A. "Etude du greffage d'enzymes sur des supports inorganiques en oxyde de nickel et oxydes de silicium : Réalisation d'un capteur enzymatique à base d'une électrode palladium/oxyde de palladium". Grenoble INPG, 1988. https://hal.archives-ouvertes.fr/tel-01069979v1.
Pełny tekst źródłaA, Abdul Malik. "Etude du greffage d'enzymes sur des supports inorganiques en oxyde de nickel et oxydes de silicium réalisation d'un capteur enzymatique à base d'une électrode palladium/oxyde de palladium /". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37611144q.
Pełny tekst źródłaNassreddine, Salim. "Hydroconversion de la tétraline sur catalyseurs à base d'iridium supporté sur silice-alumine". Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00812690.
Pełny tekst źródłaBanini, Serge R. "Palladium-catalyzed syntheses of indoles, pyrroloindoles, quinolines a base-mediated formation of N-alkoxyindoles, and progress toward the first total synthesis of echinosulfone A /". Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5710.
Pełny tekst źródłaTitle from document title page. Document formatted into pages; contains xv, 275 p. : ill. Includes abstract. Includes bibliographical references (p. 107-113).
Mugo, Jane Ngima. "Polymerization and oligomerization reactions mediated by metallodendrimers of zinc and palladium". Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20215.
Pełny tekst źródłaMassicot, Fabien. "Nanoparticules mono- ou bimétalliques à base de nickel ou de palladium : De leur structure à leur activité catalytique". Nancy 1, 2000. http://docnum.univ-lorraine.fr/public/SCD_T_2000_0065_MASSICOT.pdf.
Pełny tekst źródłaLapisardi, Grégory. "Oxydation du méthane dans les effluents de moteurs à gaz fonctionnant en mélange pauvre sur des catalyseurs à base de métaux précieux". Lyon 1, 2007. http://www.theses.fr/2007LYO10030.
Pełny tekst źródłaThe present work concerns the study of catalysts based on Pt and Pd for the total oxidation of methane with the aim of its removal from lean-burn gas motors exhausts (NGV, cogeneration). Monometallic Pd and Pt catalysts and bimetallic PdxPt1-x catalysts were deposited on Al2O3 and SnO2 and studied. The influence of a mild steam ageing under wet atmosphere simulating along-term use was examined. Pd-rich bimetallic catalysts on Al2O3 exhibit better catalytic properties than the reference Pd/Al2O3 catalyst: better resistance upon ageing, better activity in wet atmosphere. These properties are related with an interaction of Pt with Pd, interaction revealed by various physico-chemical techniques. The use of SnO2 as support does not allow to improve the catalytic performances of mono or bimetallic catalysts. All the studied catalysts deactivate in the presence of sulphur-containing compounds (H2S, SO2) due to poisoning of active sites. The stability of the poison species depends on the metal, the support used and the reaction temperature
Moysan, Isabelle. "Application des solutions solides à base de palladium, platine et rhodium au stockage solide des isotopes de l'hydrogène : structure électronique, stabilité sous hydrogène et vieillissement sous tritium". Dijon, 2001. http://www.theses.fr/2001DIJOS037.
Pełny tekst źródłaAkhachane, Abdelkrim. "Sensibilité au dépôt de carbone de catalyseurs à base de platine et de palladium déposés sur support peu acide". Poitiers, 1994. http://www.theses.fr/1994POIT2295.
Pełny tekst źródłaDIAGNE, CHEIKH T. "Transformation du gaz de synthese en alcools sur catalyseurs a base de palladium et de cobalt-cuivre : aspects mecanistiques". Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13199.
Pełny tekst źródłaDiagne, Cheikh Talibouya. "Transformation du gaz de synthèse en alcools sur catalyseurs à base de palladium et de cobalt-cuivre aspects mécanistiques /". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37613136k.
Pełny tekst źródłaFigueiredo, Flavia Camargo Alves. "A hidrogenação do adipato de dimetila em presença de catalisadores a base de Pt e Pd". [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267195.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
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Resumo: A hidrogenação do adipato de dimetila catalisada por Pt e por Pd foi avaliada. Os catalisadores foram suportados em alumina, titânia e carvão. Os parâmetros investigados foram: a influência do suporte, a influência do metal ativo Pd quando comparado com Pt e a influência dos promotores Sn e K em alguns catalisadores. A caracterização físico-química dos sistemas catalíticos foi feita por Fisissorção de 'N IND. 2¿ ¿ BET, Quimissorção de 'H IND. 2¿, Microscopia Eletrônica de Varredura ¿ MEV, Redução a Temperatura Programada ¿ TPR e Espectrometria de Emissão Ótica em Plasma Indutivamente Acoplado ¿ ICP OES. A dispersão dos metais nos catalisadores mostrou-se diretamente relacionada à área superficial dos suportes, sendo que partículas bimetálicas ou parcialmente cobertas (no caso da titânia) podem estar presentes. O suporte altera o comportamento dos metais presentes na sua superfície por diferentes maneiras: efeito SMSI (titânia), acidez (aluminia) e presença de grupos funcionais oxidados (carvão). A conversão de adipato de dimetila á reduzida na presença do suporte titânia e aumenta quando o suporte é alumina, o que está relacionado à acidez deste, com a formação de uma elevada quantidade de produtos indesejáveis. Maiores valores de seletividade para a produção de 1,6 ¿ hexanodiol são observados com o uso de titânia, uma vez que espécies parcialmente reduzidas do suporte favorecem a ativação da carbonila do substrato ...Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital
Abstract: The hidrogenation of dimethyl adipate catalyzed by Pt and Pd was evaluated. The catalysts were supported in 'Al IND. 2¿¿O IND. 3¿, 'TiO IND. 2¿ and coal. The investigated parameters were: the influence of the support, the influence of the active metal Pd when compared to Pt and the influence of Sn and K as promoters in some catalysts. The physical-chemistry characterization of the catalytic system was made by 'N IND. 2¿ sorption ¿ BET, 'H IND. 2¿ soption, Scanning Electron Microscopy ¿ SEM, Temperature Programmed Reduction ¿ TPR and Inductively coupled Plasma Optics Emission superficial area of the supports, and bimetallic particles or partially covered (in the case of the 'TiO IND. 2¿) can be present. Support modifies the behavior of metals in the surface for different ways: SMSI effect ('TiO IND. 2¿), acidity ('Al IND. 2¿¿O IND. 3¿) and presence of oxidized functional groups (coal). The conversion of dimethyl adipate is reduced in the presence of 'TiO IND. 2¿ and increases when the support is 'Al IND. 2¿¿O IND. 3¿. This is related to the 'Al IND. 2¿¿O IND. 3¿ acidity, with the formation of many undersirable products. Higher selectivity values for the production of 1,6-hexaodiol are observed with 'TiO IND. 2¿, due to the partially reduced species of the support that favor the activation of the carbonyl...Note: The complete abstract is available with the full electronic digital thesis or dissertations
Mestrado
Sistemas de Processos Quimicos e Informatica
Mestre em Engenharia Química
Duval, Marion. "Procédés originaux d’hydrogénation à base de nanoparticules de palladium et ruthénium pour la valorisation de dérivés terpéniques en catalyse multiphasique". Thesis, Rennes, Ecole nationale supérieure de chimie, 2020. http://www.theses.fr/2020ENCR0069.
Pełny tekst źródłaADHAM-GEDEON, SAMAR. "Agregats bimetalliques a base de palladium : influence des elements s#2#p#2 sur la reaction d'hydrogenation du butadiene-1,3". Paris 6, 1992. http://www.theses.fr/1992PA066382.
Pełny tekst źródłaMoraes, Leticia Poras Reis de. "Eletrocatalisadores à base de paládio para células a combustível de etanol direto alcalinas (ADEFC)". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/118828.
Pełny tekst źródłaDirect Ethanol Fuel Cells (DEFC) require the use of electrocatalysts to promote the electrochemical decomposition of the ethanol molecule efficiently. Currently, most of the electrocatalysts are platinum (Pt) based, which exhibits high catalytic activity in acid media. However, Pt has high cost, which postpones the fuel cell commercialization. In this context, new platinum-free catalysts have been developed, as palladium (Pd) and Pd based alloys, as an outcome of the high catalytic activity for ethanol oxidation reaction (EOR) in alkaline media. As the electrocatalysis is a surface phenomenon, the catalysts are usually deposited on electron conducting supports with high surface specific area. In order to create functional sites on the support surface, chemical treatments can be performed to incorporate oxygenated species in the carbon surface. In the present work, electrocatalysts of Pd, PdNi, PdSn and PdNiSn supported on functionalized Vulcan XC72R were synthesized by the impregnation-reduction method. The catalyst supports were characterized by thermogravimetric analysis (TGA), infrared spectroscopy, textural, elemental and ash analyzes, which confirmed that the functionalization promoted an increase of the oxygenated species on the support surface. The electrocatalysts were characterized by TGA, energy dispersive X-rays (EDX), cyclic voltammetry (CV), X-ray diffraction (XRD), transmission electron microscopy (TEM), and tested in ADEFC unit cell. The EDX and TGA measurements confirmed that the synthesis method allowed preparing the electrocatalysts with the expected composition metallic loading. The crystallite and particle sizes, estimated by XRD and TEM, respectively, were in the nanometric range ~ 5 a 14 nm. The XRD measurements indicated the formation of alloy between Pd and Sn, and for the Ni containing catalysts it was observed the oxide formation, suggesting no alloy formation between Pd and Ni. The CV curves for the functionalized electrocatalysts evidenced that the onset potential for EOR towards more negative values, with higher current density values compared to the non-funcionalized samples. The CV measurements and ADEFC tests showed that the electrocatalysts PdSn and PdNiSn exhibited high performance for the EOR compared to Pd, in such a way that the ternary electrocatalyst supported on functionalized carbon (PdNiSn/CF) exhibited the highest performance in ADEFC.