Literatura académica sobre el tema "Catalyse – Teneur en silicium"
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Artículos de revistas sobre el tema "Catalyse – Teneur en silicium"
Friedmann, Gilbert y Jean Brossas. "Synthese de membranes permeables a l'oxygene: influence de la teneur en silicium". European Polymer Journal 29, n.º 11 (noviembre de 1993): 1463–65. http://dx.doi.org/10.1016/0014-3057(93)90059-o.
Texto completoBrun, G., R. Nicolle, J. M. Steiler, J. L. Bouttement, J. L. Eymond y J. P. Menaut. "Injection de minerai au haut fourneau et maîtrise de la teneur en silicium". Revue de Métallurgie 85, n.º 1 (enero de 1988): 21–32. http://dx.doi.org/10.1051/metal/198885010021.
Texto completoDadras, M. M. y G. Cizeron. "Comportement structural lors de trempes étagées de fontes G.S. au molybdène ayant une teneur élevée en silicium". Matériaux & Techniques 81, n.º 4-5 (1993): 19–28. http://dx.doi.org/10.1051/mattech/199381040019.
Texto completoTesis sobre el tema "Catalyse – Teneur en silicium"
Pascaretti, Mathieu. "Catalyse synergique οr/silicium par activatiοn d’οrganοsilanes et d’hydrοsilanes au mοyen de cοmplexes d’Au(Ι) : dévelοppements et applicatiοns". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH01.
Texto completoSince the early 2000s, gold catalysis has developed particularly well in organic chemistry, offering new highly efficient synthetic methods, generally under very mild conditions. These advances have also led to abundant use in glycoscience, but despite important breakthroughs, the application of gold catalysis in glycochemistry is typically limited to conventional modes of sugar donor activation, in which the gold complex remains strictly confined to the role of a σ- or π-Lewis acid. The research work presented through this manuscript tends to introduce a new paradigm in gold-catalysed glycosylation reactions, by developing catalytic alkynylation reactions in which the gold complex should overcome the intrinsic difficulties of these couplings by contributing to the simultaneous activation of the sugar donor and the alkyne aglycone, based on an original gold/silicon synergistic catalysis strategy. The ideal combination of gold catalyst and counterion was sought (L and X) to achieve optimum catalytic reactivity and stereochemical control both for the alkynylation reaction of simple saturated glycosides and for the alkynylation of glycals. The discovery of a major impact of a hitherto unexploited Au(I) complex counterion in synergistic gold/silicon catalysis associated with a strongly deactivating phosphine has made it possible to extend the field of application of synergistic gold/silicon catalysis beyond the alkynylation of glycosides
Hoàng, Quoc Lam. "Séparation sélective de la cellulose, des hémicelluloses et des lignines par le système catalyseur-solvant : acide formique-acide acétique, de matières végétales à teneur variable en silicium". Toulouse, INPT, 2000. http://www.theses.fr/2000INPT002C.
Texto completoGuntzer, Flore. "Impact de la culture intensive de céréales sur les stocks de silice biodisponible dans les sols européens". Aix-Marseille 3, 2010. http://www.theses.fr/2010AIX30064.
Texto completoSilicon is found in the same proportions as most macronutrients in plants and is known to be beneficial for their growth. Although silicon is one of the main constituents of soil, most of the forms under which it is found are not available for plants. In natural ecosystems, phytoliths (amorphous silica particle recycled by plants) are one of the main sources of silicon for plants as their dissolution cinetic is way faster than that of other silicate minerals at pH > 4. However in cultuvated soils where the crops are exported, phytoliths do not come back to the soil. We studied soils cultivated with cereals to asses the impact of the exportation of crops on the amorphous silica stock. All studied soils were poor in amorphous silica. We also studied the effect of different Si fertilization. Restoration of straw to the soil, even for a short period of time, has a real impact on the stock of amorphous silica. This means the restitution of straw could be a simple remediation for the decrease of the bioavailable silica stock of cultivated soils
Ducos, Paul. "Synthèse de nouveaux acides de Lewis silylés pour la catalyse organique". Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0439/document.
Texto completoIn contrast with carbocations which existence was unambiguously proven in the early 60’s, silylium ions (R3Si+) have remained for a long time elusive species and putative intermediates in many transformations involving organosilicon compounds. It was only in 2002 that the first structural proof (X-ray crystallography) dispelled any doubt about the existence of tricoordinated silicon cations in the condensed phase. Silylium ions are extremely electrophilic, able to coordinate to weak Lewis bases including solvent molecules such as benzene. The possibility to tame this acidity through an appropriate labile coordination even widens the scope of applications of these reactive species and allows their use as catalysts for organic synthesis. The aim of this thesis was to synthesize new stabilized silyliums ions and rationalize the impact of this stabilization onto the reactivity. In a first part, we focused on the use of hindered nitrogen derivatives to stabilize the silicon center. The nature and the strength of the interaction were assessed by NMR spectroscopy and theoretical calculations. In a second part, the introduction of chirality onto the silicon cation has been studied. A series of binaphtyl templated silyliums bearing an intramolecular Lewis base were synthesized. According to the strength of the stabilization, the chiral information present on the silicon can be persistent and used for asymmetric catalysis
Wang, Huiyuan. "Quantification et distribution du bore dans le silicium implanté". Rouen, 2013. http://www.theses.fr/2013ROUES042.
Texto completoThis work is composed by three parts. In the first part, we have studied theoretically the influence of the temperature on the nucleation rate of precipitates in a supersaturated binary alloy. The more elaborate theory of Zeldovich has shown that the nucleation rate present a single maximum as function of temperature, which is similar to the classical theory of Volmer-Weber. A comparison between those two theories has shown that the regression effects (the supercritical germs can dissolve in a small area around the critical size) have a strong influence on the nucleation rate. We have applied this theoretical study into the Si-B system. Due to the high activation energy of B in the Si, the study has shown a weak influence of the regression effects, resulting in a slight decrease in temperature giving the maximum of the nucleation rate in the Si-B system. In the second part, the secondary ion mass spectrometry (SIMS), Scanning transmission electron microscopy - Electron energy loss spectroscopy (STEM-EELS) and the atom probe tomography (APT) have been combined for the quantification of B in high concentration implanted Si, their strengths and weaknesses have been shown in the characterization of B in Si. Concerning the multi-hit detection in APT, a new method of treatment of signals coming from the detection system of the atom probe has been applied. An important progress concerning the multi-hit detection and the quantification of B in the Si has been demonstrated by our experiences. In the third part, we have studied the precipitation of B in the Si weakly supersaturated and highly supersaturated. The studies of the precipitation of B in the Si weakly supersaturated have shown that it is very difficult to study only the precipitation due to the presence of implantation defects (dislocation loops…). To privilege the precipitation, the study of the precipitation of B in the highly supersaturated Si has shown that there is phase separation after the implantation. At low thermal budget, the composition of the precipitates is much lower than the one of the equilibrium phase SiB3, but at high temperature, a regime of Si-B spinodal decomposition is suspected for the more concentrated alloys
Leroux, Denis. "Polystyrène sulfoné supporté sur silice poreuse : greffage et activité en catalyse acide". Lyon 1, 1994. http://www.theses.fr/1994LYO10290.
Texto completoDavach, de Thèze Jean-François. "Vapoconversion catalytique sélective de produits aromatiques en présence de composés soufrés". Lyon 1, 1986. http://www.theses.fr/1986LYO10521.
Texto completoBrouty, Marie-Sophie. "Recherche de nouveaux catalyseurs acides supportés de type polyphénylsilsesquioxanes chlorés sulfonés greffés sur silices". Lyon 1, 1995. http://www.theses.fr/1995LYO10135.
Texto completoLecomte, Sandrine. "Préparation des diénolates de potassium à partir des diénoxysilanes et du tertiobutylate de potassium : Etude de leur condensation régiosélective avec les dérivés carbonylées. Mise au point d'une méthode de prénylation". Rouen, 1997. http://www.theses.fr/1997ROUES072.
Texto completoMadani, Behrang. "Synthèse de Fischer-Tropsch sur catalyseur à base de cobalt supporté sur carbure de Silicium". Université Louis Pasteur (Strasbourg) (1971-2008), 2005. https://publication-theses.unistra.fr/public/theses_doctorat/2005/MADANI_Behrang_2005.pdf.
Texto completoThe Fischer-Tropsch synthesis (FTS) leads to various products, mainly alkanes as well as olefins and alcohols, starting with precise mixture of CO and H2. Currently, natural gas is recovered as a by-product of oil extraction and directly burnt, which leads a non negligible economic loss as well as an atmospheric pollution due to the production of CO2. The reaction of FTS is one of the ways permitting valorisation of natural gas after its transformation in gas of synthesis (mixture of CO and H2). The SFT reaction is exothermique and requires fast evacuation of heat from the catalytic sites in order to avoid the problem of hot spots formation and subsequent cracking of formed products. The supports used traditionally for the FTS are insulating supports, such as alumina and silica, which does not permit a good evacuation of heat. In this work, we replaced the insulating support by a conducting support based on SiC, which permits a better homogenisation of the temperature in the catalytic bed. In this study, different reaction parameters- the Co content, the total pressure and contact time, have been optimized in order to obtain the best activity, selectivity and stability of the catalysts. We also studied the influence of the morphology of the support on the catalyst performance. Among the different shapes of support based on SiC (grain, extrudes and foam), the support as foam seems to have the best performance. We finalised the procedures of regeneration of the catalyst as well as the doping by molybdenum. The thus obtained catalysts present the best activity and selectivity