Literatura científica selecionada sobre o tema "Catalyseurs – Surfaces"
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Artigos de revistas sobre o assunto "Catalyseurs – Surfaces":
Taoufik, M., C. Santini, JM Basset e JP Candy. "Greffage de dérivés chiraux du germanium sur des surfaces métalliques. Génèse de catalyseurs hétérogènes asymétriques par voie chimie organométallique de surface". Journal de Chimie Physique 94 (1997): 1969–74. http://dx.doi.org/10.1051/jcp/1997941969.
Zalma, Roger, Lionel Bonneau, Jeanine Fournier, Joëlle Guignard, Françoise Borg e Henri Pezerat. "Hydrodésazotation de l'indole sur catalyseur fer supporté sur amiante". Canadian Journal of Chemistry 65, n.º 3 (1 de março de 1987): 523–27. http://dx.doi.org/10.1139/v87-091.
Schneider, E. M., M. Zeltner, N. Kränzlin, R. N. Grass e W. J. Stark. "Base-free Knoevenagel condensation catalyzed by copper metal surfaces". Chemical Communications 51, n.º 53 (2015): 10695–98. http://dx.doi.org/10.1039/c5cc02541a.
Alonso, Rafael, Pilar Jiménez-Meneses, Jaime García-Rupérez, María-José Bañuls e Ángel Maquieira. "Thiol–ene click chemistry towards easy microarraying of half-antibodies". Chemical Communications 54, n.º 48 (2018): 6144–47. http://dx.doi.org/10.1039/c8cc01369a.
Weiss, Karin, e Kurt Hoffmann. "Untersuchungen von Polymerisations-und Metathesereaktionen, X. Mitt. [1] Polymerisation, Trimerisation und Metathese von Allenen und Heteroallenen mit reduziertem Phillips-Katalysator / Studies of Polymerisation and Metathesis Reactions, Part X [1] Polymerisation, Trimerisation and Metathesis of Allenes and Heteroallenes with Reduced Phillips Catalyst". Zeitschrift für Naturforschung B 42, n.º 6 (1 de junho de 1987): 769–73. http://dx.doi.org/10.1515/znb-1987-0621.
Fukui, Ken-ichi, Satoru Takakusagi, Ryugo Tero, Masaki Aizawa, Yoshimichi Namai e Yasuhiro Iwasawa. "Dynamic aspects and associated structures of TiO2(110) and CeO2(111) surfaces relevant to oxide catalyses". Physical Chemistry Chemical Physics 5, n.º 24 (2003): 5349. http://dx.doi.org/10.1039/b307879e.
Yang, Bin, Jianping Li, Lianming Zhang e Guobao Xu. "A molecularly imprinted electrochemiluminescence sensor based on the mimetic enzyme catalytic effect for ultra-trace Ni2+ determination". Analyst 141, n.º 20 (2016): 5822–28. http://dx.doi.org/10.1039/c6an00926c.
Liu, Jian, Fei He e Ka Di Zhu. "Surface plasmonic catalysis based on molecular optomechanics". Europhysics Letters 137, n.º 2 (1 de janeiro de 2022): 25002. http://dx.doi.org/10.1209/0295-5075/ac4d3f.
Paille, Grégoire, Amandine Boulmier, Alexandre Bensaid, Minh-Huong Ha-Thi, Thu-Trang Tran, Thomas Pino, Jérôme Marrot et al. "An unprecedented {Ni14SiW9} hybrid polyoxometalate with high photocatalytic hydrogen evolution activity". Chemical Communications 55, n.º 29 (2019): 4166–69. http://dx.doi.org/10.1039/c9cc01269a.
Pattanaik, Sandip, e Chidambaram Gunanathan. "Cobalt-catalysed selective synthesis of aldehydes and alcohols from esters". Chemical Communications 56, n.º 53 (2020): 7345–48. http://dx.doi.org/10.1039/d0cc03076g.
Teses / dissertações sobre o assunto "Catalyseurs – Surfaces":
Norsic, Sébastien. "Traitement chimique des surfaces des alumines silicées : application à l'hydrocraquage". Poitiers, 2006. http://www.theses.fr/2006POIT2314.
The aim of our work was to find new hydrocracking catalysts allowing a selective transformation of vacuum distillates into gas oil. Hydrocracking catalysts are bifunctional, associating a metallic function (hydro-dehydrogenating) and an acidic function (isomerizing). The vacuum distillates containing nitrogen and sulphur compounds, the hydro-dehydrogenating function will be provided by metal sulphides. On the other hand, if gas oil is the desired product, the acid function must be fairly strong. The most currently used catalysts are sulphides of Ni and W deposited on silica-alumina. We chose in this work to use a little different support : silicated aluminas, and to study the effect of heat treatments of this support, calcination or steaming, on the activity and the selectivity for hydrocracking of the sulphided catalysts. Calcination or steaming of silicated alumina brings important modifications of surface and pore volume, but do not modify the characteristics of the solid. In addition, these treatments, and in particular the steaming, create new Brönsted acid sites on the surface. The isomerizing activity of the corresponding catalysts is higher, and consequently their activity in hydrocracking is also higher. Indeed we observed that on these catalysts, the rate limiting step of hydrocracking was the acidic step. At the difference of what is generally observed, this increase in activity is not accompanied by a decrease in selectivity. Thus, the sulphided NiW/silicated alumina catalysts could be excellent industrial catalysts for hydrocracking. We also showed that it was possible to protect the acid sites of silicated alumina during the impregnation by nickel and tungsten, by blocking these sites by adsorption of pyridine. Unfortunately, the presence of pyridine considerably harms the formation of the sulphided phase, which makes the catalysts not very efficient in hydrocracking
Tougerti, Asma. "Elaboration de catalyseurs MoOx/Al2O3 : une approche science des surfaces en phase aqueuse". Paris 6, 2010. http://www.theses.fr/2010PA066137.
Ionescu, Andrei-Radu. "Modélisation des catalyseurs d'hydrodésulfuration : étude théorique des interactions entre le support et la phase active". Aix-Marseille 1, 2003. http://www.theses.fr/2003AIX11023.
Herry, Soazic. "Étude de l'activation de catalyseurs d'hydrodésulfuration des gazoles préparés par modification du précurseur oxyde". Lille 1, 2006. http://www.theses.fr/2006LIL10160.
The presence of heteroatoms such as sulphur is an atmospheric pollutant because of its combustion products. 2005 is important year with the application of Euro4 regulations, in the European Union, which allowed 50 ppm of sulphur in gasoline and diesel and in 2009 this will decrease to 10 ppm. This implies an optimization of HDS process as well as the improvement of HDS catalysts. One of way of study to improve HDS catalysts is to add organic compounds in the preparation of catalysts. The purpose of this work is to understand the role of these molecules on the oxidic precursors, on the activation step and on the active phase morphology. An activation study has thus been done, in both gas and liquid phases which completed by physico-chemical characterizations, and showed the main role of organic compounds. The characteristic evolution of metals during sulfidation induces an optimization of the active phase morphology which is in correlation with the improvement of the catalytics performances
Marion, Ronan. "Catalyse supportée en flux continu utilisant des feutres de carbone de grande surface spécifique". Rennes 1, 2011. http://www.theses.fr/2011REN1S130.
This work is about the synthesis of new copper and ruthenium complexes containing tripodal ligands for application in continuous flow catalysis. These catalysts have been tested in oxidation reactions. A family of N-tripodal ligands has been prepared to determine the influence of several parameters on the catalytic activity such as steric effects, basicity or electronic effects of the substituants. Moreover, these ligands have a functionalized arm, which will be to attach the complexes onto the support. Copper complexes have been tested in homogeneous catalysis and then in continuous flow catalysis in a catechol oxidation reaction to study the influence of their immobilization on their catalytic activity. Once the determining factors in homogeneous medium were identified, a covalent grafting process on graphite felt has been set up. By electrochemical reduction of diazonium salts, a homogeneous and fast functionalization of the graphite felt has been achieved, allowing the chemical attachment of the complexes with volume concentrations around 10-8 mol. Cm-3. Then, continuous flow catalysis has been realized showing better catalytic activities than in homogeneous medium. Studies about the stability and the influence of the chain nature and length have also been performed. A preliminary study on ruthenium catalysts provided the synthesis of a new complex containing a N-tripodal ligand
Bara, Cédric. "Catalyseurs d'hydrotraitement à base de Mo supporté sur alumine : genèse de la phase active et effet de support par une approche science des surfaces". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066332/document.
The objective of this work was to develop a surface science approach to study the support effect on the genesis and structure of the active phase (molybdenum sulfide) on alumina supported Mo based hydrotreating catalysts supported on alumina which are used for petroleum refining. The originality of the work lies in the aqueous phase metal precursor deposition (molybdates) according to two synthetic routes (equilibrium adsorption and impregnation) on α alumina single crystals (γ alumina surrogate) with 4 different orientations (C (0001), R "(1" ¯("1" ) "02)" , A "(11" ¯("2" ) "0)" and M "(10" ¯("1" ) "0)" ). The combination of several physico-chemical characterization techniques (XPS, AFM, TEM, EXAFS) has shown that the surface structure of each crystal orientation governs the strength of metal/support interaction in the oxide state and thus the sulfidation degree and size of the sulfide active phase nanoparticles. This sulfide phase has been associated to a type I (strong metal/support interactions, lower sulfurability) for the R "(1" ¯("1" ) "02)" plane and to a type II (weaker metal/support interactions and better sulfurability) for C (0001), A "(11" ¯("2" ) "0)" and M "(10" ¯("1" ) "0)" planes. In addition, EXAFS results suggest a predominantly basal orientation of the sulfide phase on the C (0001) plane while a random orientation is highlighted on the other faces. The surface structural analogies between α and γAl2O3 polymorphs allows us to transpose these results to the industrial support (γ-Al2O3) and hence, to conclude that a proper control of the industrial support morphology constitutes a way to tune the genesis of the sulfide phase and improve the performances of hydrotreating catalysts
Barthe, Philippe. "Etude des effets du broyage et de l'addition de catalyseurs sur la réactivité d'un coke de charbon de Freyming". Lyon 1, 1987. http://www.theses.fr/1987LYO10533.
Carlier, Eric. "Elaboration et caractérisation de catalyseurs par greffage de polymères fonctionnalisés sur silices poreuses : tests de l'activité catalytique". Lyon 1, 1990. http://www.theses.fr/1990LYO10225.
Weissmann, Martin. "Modification de supports carbonés pour catalyseurs de pile à combustible par greffage de molécules à propriétés spécifiques". Poitiers, 2009. http://theses.edel.univ-poitiers.fr/theses/2009/Weissmann-Martin/2009-Weissmann-Martin-These.pdf.
The modification of carbon substrates by chemical functions significantly affects the surface properties of the material. These changes can be carried out by different methods: oxidation of the support, or grafting of molecules by reduction of a synthon. This last method seems more attractive because it helps to maintain the integrity of the support. The realization of grafted layers on carbon surface is carried out by reduction of diazonium or iodonium ions. This reduction results in the formation of radicals, which react with carbon surface to form a covalent bond. This method allows grafting a large variety of molecules; by selecting appropriate terminal groups it is possible to change different characteristics of the active layer of PEMFC electrodes, such as the hydrophobic / hydrophilic properties, platinum / support interactions and ionic conductivity. In this context, thiophenol grafted layers were realized to strengthen the anchorage of platinum nanoparticles on carbon support, limiting the migration of nanoparticles in course of sintering process. Carbon functionalized with benzenesulfonic acid groups and trifluoromethylbenzene groups were used to adjust the wettability of active layers, in order to improve water management in fuel cells. Grafted layers of alkynyl groups with ionic end functions could also be performed to confer ionic conductivity (protons or hydroxyls) to the catalyst support, in order to improve the use of catalyst in fuel cell electrodes
Rosal, Iker Del. "Modélisation de nanoparticules produites par voie organométallique et de catalyseurs greffés : structure, spectroscopie, réactivité". Toulouse 3, 2009. http://thesesups.ups-tlse.fr/1272/.
The work presented in this PhD manuscript concerns the study of surface chemistry and it is based on two questions asked by different experimental research groups. These questions cover different areas of surface chemistry, their answer would lead to a better understand the interactions occurring on these surfaces. This work is divided into two parts, each of which are based on the following issues: In which positions are the hydrogen atoms coordinated on the surface of ruthenium nanoparticles and which effect have the ligands on these atoms? It is of great interest in materials science to be able to control the size, shape and composition of nanoparticles (NPs) during their synthesis process. Their physico-chemical properties, comprised between those exhibited by small molecular compounds and the bulk, are one of the best advantages of these NPs. The NPs have an extremely rich surface chemistry, relatively little studied, that may influence both their chemical and physical properties. In this study, we are particularly interested in hydrogen atoms that play a key role in both the size and the shape of the NPs. However, their coordination mode remains unknown. To answer this first question, the NPs were modeled by two limit systems : small clusters and periodic surfaces. The study of these two systems allowed us, through a theory / experiments comparison of several spectroscopic data such as proton, deuterium NMR and infrared data to determine the most likely coordination mode of these hydrogen atoms and the effect of ligands on them. How organometallic catalysts are they grafted on a silica surface during catalytic supported reactions and which is the impact of the grafting mode on their reactivity ? The importance of catalysis both from an economic perspective (industrial) and environmental perspectives, requires the use of more efficient catalysts. One approach to achieve this goal is to have a better distribution and definition of active sites involved in heterogeneous catalysis process. One possibility to achieve this control is the use of supported catalysis. However, a prerequisite for this type of catalysis includes precise knowledge of the different types of interactions existing between the catalyst and its support. However, in the case of a lanthanide catalyst grafted on silica surface, the grafting mode remains unknown. As in the previous study, there are two methods to address this problem: either by a periodic approach, either by a molecular approach. Several different considerations led us to choose a molecular approach to conduct this study. For that purpose, we have created a molecular model that represents as accurately as possible the silica surface. The grafting reaction was then studied on this model, giving rise to different grafting modes, which are in accordance with the experimental data. Finally, a comparison between different catalytic reactions taking place with a metallocene lanthanide complex and the grafted catalyst above described has also been undertaken. Throught this investigation we could compare the reactivity of these two systems and determine the role of surface on the catalyst reactivity
Livros sobre o assunto "Catalyseurs – Surfaces":
International Conference on Fundamentals of Adsorption (4th 1992 Kyoto, Japan). Fundamentals of adsorption: Proceedings of the Fourth International Conference on Fundamentals of Adsorption, Kyoto, May 17-22, 1992. Tokyo: Kodansha, 1993.
(Editor), Aldo Gamba, Carmine Colella (Editor) e Salvatore Coluccia (Editor), eds. Oxide Based Materials: New Sources, Novel Phases, New Applications (Studies in Surface Science and Catalysis). Elsevier Science, 2005.
Fundamentals of adsorption: Proceedings of the Fourth International Conference on Fundamentals of Adsorption, Kyoto, May 17-22, 1992 (Studies in surface science and catalysis). Elsevier, 1993.
Furimsky, Edward. Catalysts for Upgrading Heavy Petroleum Feeds, Volume 169 (Studies in Surface Science and Catalysis) (Studies in Surface Science and Catalysis). Elsevier Science, 2007.
Capítulos de livros sobre o assunto "Catalyseurs – Surfaces":
Toshima, Naoki, Ping Lu e Yuan Wang. "Preparation, characterization and catalyses of light-transition-metal/noble-metal bimetallic alloy nanoclusters". In Studies in Surface Science and Catalysis, 243–46. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)82078-4.
Olsnes, S. "Pseudomonas aeruginosa exotoxin A". In Guidebook to Protein Toxins and Their Use in Cell Biology, 50–51. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198599555.003.0017.