Literatura científica selecionada sobre o tema "Hydrogène – Synthèse (chimie) – Stockage"
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Artigos de revistas sobre o assunto "Hydrogène – Synthèse (chimie) – Stockage"
Hauet, Jean-Pierre. "Captage, stockage et valorisation du CO 2 : un nouveau départ". Futuribles N° 455, n.º 4 (16 de junho de 2023): 27–31. http://dx.doi.org/10.3917/futur.455.0027.
Texto completo da fonteTeses / dissertações sobre o assunto "Hydrogène – Synthèse (chimie) – Stockage"
Gagnon-Thibault, Évelyne. "Synthèse et caractérisation de matériaux polymères poreux pour le stockage d'hydrogène". Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/29167/29167.pdf.
Texto completo da fonteDepardieu, Martin. "Chimie intégrative pour la synthèse de matériaux fonctionnels avancés". Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0316/document.
Texto completo da fonteHierarchical porosity in solid foams allows the combination of the advantages offered by the different scales of structuration : macropores allow high porous volume and easy diffusion of reagents, while mesopores and micropores allow confinement and high specific surface areas. Integrative chemistry, associating soft matter and soft chemistry, offers a variety of synthetic pathways to generate such materials. We used emulsions and surfactants to template sol-gel chemistry in order to obtain silica foams bearing hierarchical porosity. These silica foams were employed as hard templates to synthesize carbon foams, used as electrodes in lithium-sulfur batteries bearing high capacities. We then explored the impact on performances of loading them with metallic nanoparticles. We also studied the potential of those carbon foams for hydrogen storage, and we obtained cycling capabilities with LiBH4 after loading them with metallic nanoparticles. Finally, the silica foams were used as a support for bacterial growth. Indeed, when bacteria grow in a confined medium, the kinetics of growth and their final concentration can be totally different than what is observed in classical cultures, which is of high interest for applications such as biocatalysis
Fang, Wenhao. "Production d’hydrogène par transformation du bioéthanol sur catalyseurs à base de nickel". Electronic Thesis or Diss., Lille 1, 2013. http://www.theses.fr/2013LIL10026.
Texto completo da fonteThe potential benefits of hydrogen economy based on renewable energy sources (biomass) have drawn much attention. Hence studies on H2 production from catalytic transformation of bio-ethanol are very interesting and promising. Two types of Ni-based catalysts, CeNiXOY and NiXMg2AlOY, are studied for H2 production from ethanol through two routes, steam reforming and oxidative steam reforming (H2O/EtOH = 3). Numerous physico-chemical characterizations of the catalysts allow proposing active sites and possible mechanism. The CeNiXOY and NiXMg2AlOY nano-compounds are able to store different hydrogen species in particular hydride species. Once in situ treated in H2 at proper temperature, these mixed oxides become nano-oxyhydrides with the presence of anionic vacancies, O2- species and cations in close interactions which are highly active and efficient catalysts for ethanol steam reforming. The Ni12Mg2AlOY catalyst allows obtaining a low-temperature high-yield H2 production of 3 mol molEtOH-1 at 300 °C without the formation of CO. The Ni3Mg2AlOY and CeNi1OY catalysts are able to produce a very high H2 production of about 5 mol molEtOH-1 at 650 °C. In the presence of O2, CeNiXHZOY and NiXMg2AlHZOY oxyhydrides (30 mg) enable to completely convert ethanol with about 45 mol% H2 production with the oven temperature at only 60 °C, showing remarkable stability for 75 h on stream. This self-sustainable reaction is driven by the energy released from the strong exothermic reaction between the hydride species stored in the catalysts with O2, at the same time hydride species are continuously formed from ethanol to make the reaction sustainable
Bououdina, Mohamed. "Étude d'alliages et d'hydrures dérivés des phases de laves ZrCr2(1-x)M2x (M=éléments 3d et molybdène) : Synthèse, études structurale et thermodynamique en relation avec les propriétés de stockage de l'hydrogène". Grenoble 1, 1995. http://www.theses.fr/1995GRE10056.
Texto completo da fonteYu, Zhewei. "Equilibrium and kinetics studies of hydrogen storage onto hybrid activated carbon-metal organic framework adsorbents produced by mild syntheses". Thesis, Nantes, Ecole des Mines, 2016. http://www.theses.fr/2016EMNA0236/document.
Texto completo da fonteSince the last 15 years, the porous solids such as Metal-Organic Frameworks (MOFs) have opened new perspectives for the development of adsorbents for hydrogen storage. The structure and the pore networks of these materials are especially adapted to the adsorption of gases. The chromium (III) terephthalate-based MIL-101(Cr) is a very stable material which exhibits good adsorption uptakes for hydrogen (H2), carbon dioxide (CO2) and methane (CH4).In this study, syntheses were carried out by different ways and several mineralizing agents such as hydrofluoric acid (HF), acetic acid (CH3COOH) and sodium acetate (CH3COONa) have been tested. Moreover, Activated Carbon (AC) has been introduced in the framework to create an AC incorporated composite material with an enhanced specific surface area. Conventional techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and nitrogen (N2) adsorption isotherms at 77 K were used for materials characterizations.In the aim to evaluate hydrogen storage capacities of these materials, hydrogen adsorption isotherms were measured at 77 K via both volumetric and gravimetric methods, and the obtained results are in good agreement. A hydrogen uptake value of 13.5 wt% has been measured at 77 K and 100 bar for the composite material which shows a great improvement of hydrogen capacity compared to the pristine MIL-101(Cr) (8.2 wt%).Finally, hydrogen adsorption kinetics has been measured at 77 K using volumetric method. The obtained results were compared to the Linear Driving Force (LDF) and a temperature dependent diffusion model was also considered to take into account the temperature variations which occur during the adsorption process
Clémençon, Damien. "Mg(BH4)2 : synthèse, nano-confinement et catalyse". Thesis, Amiens, 2019. http://www.theses.fr/2019AMIE0047.
Texto completo da fonteThis PhD thesis concerns the field of hydrogen storage and more specifically solid-sate hydrogen storage materials. Magnesium borohydride, Mg(BH4)2, is a compound of strong interest because of its high hydrogen gravimetric capacity (14.8 %) and was the subject of this study. The literature on the decomposition of this compound is actually very inconsistent and reveals numerous contradictions. Different synthesis routes of Mg(BH4)2 were studied during the thesis in order to produce the purest possible compound and at a lower cost. A mechanical milling-assisted metathesis reaction produced Mg(BH4)2 from NaBH4 and MgCl2 precursors with an excellent yield. The hydrogen desorption properties of Mg(BH4)2 were then improved by a dual approach of catalytic additions and nano-confinement into mesoporous carbons. Core-shell Ni-Pt nanoparticles of about 1.9 nm in diameter were used as catalysts. These particles were dispersed in a carbon having mesoporous channels of 4 nm in diameter prepared by hard templating of SBA-15 silica. The results showed that the combined effect of both nano-confinement and catalysis allows the final decomposition temperature of Mg(BH4)2 to be reduced by more than 100°C while obtaining faster hydrogen desorption kinetics
Tharcis, Marion. "Synthèse et caractérisation d'assemblages supramoléculaires organisés par liaisons hydrogène dans l'eau". Paris 6, 2011. http://www.theses.fr/2011PA066058.
Texto completo da fonteGuillet, François. "Développement et optimisation d’un système de stockage d’énergie et de production d’hydrogène basé sur l’électrochimie et la chimie du zinc". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI029.
Texto completo da fonteHydrogen is an energy carrier and a potential asset for helping to lower carbon levels of energetic uses. Water electrolysis is a way of production and a good compromise to generate a large quantity of cheap and low-environmental-impact hydrogen. Compression is used to store hydrogen but electrolysers are technologically limited to reach high pressures. One solution to overcome this problem is decoupling electrolysis. It aims at separating the hydrogen and oxygen production in two steps through mediation oxydizer/reducer. Ergosup company has developed ZHYNCELEC process, using different technologies such as zinc as mediator. The first step is zinc electrodeposition which increases the acidity of solution and lead to an oxygen formation. This step is inspired by industrial zinc electro winning. The second step is the reaction between the metallic deposition and electrolyte producing hydrogen and making the dissolution of zinc. The purpose of this study is the optimisation of ZHYNCELEC process.This work can be divided in three axes of study. First, the selection of the different electrode materials. They are chosen by electrochemical performances and durability. Secondly, electrolyte composition optimization. The key factors are zinc concentration, acid concentration and the possibility of additives presences. The final axe concerns the processing aspect and the operative conditions like temperature, current density, maximal hydrogen pressure and reactor geometry. These three axes cannot be studied separately because of the interaction between the different parameters, which forces at compromising following the aim of the application of the process
Petit, Jean-Fabien. "Etude de la stabilité thermique de l’ammoniaborane : de la synthèse aux caractérisations thermogravimétriques et spectroscopiques". Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS256.
Texto completo da fonteBoron and nitrogen based-materials offer a great potential and interest in energy applications and in particular in the field of hydrogen storage. The ammonia borane (NH3BH3) was revealed, in the mid 2000s, as a material with high gravimetric (19.6%m) and volumetric (140 g.L-1) capacities in hydrogen. During the analysis of the literature we realized that all studies on ammonia borane treated on its thermal destabilization, so we chose an original approach by focusing our work on the thermal stabilization of ammonia borane. My thesis work focused on the synthesis of ammonia borane to identify the best synthesis parameters (boron and nitrogen precursors, solvent, and temperature) for the highest possible onset temperature. Indeed, by varying some precursors we observed a change in the onset temperature and therefore in the thermal stability of the ammonia borane. After determining the best synthesis parameters we undertook thermal and thermolytic studies to understand which factor(s) is(are) responsible for the stabilization's differences. For this, we performed thermogravimetric analysis coupled to mass spectrometer studies to determine the dehydrogenation mechanism and studies in isothermal conditions to verify the stability of our ammonia boranes. Thirdly we performed a spectroscopic study by XPS and solid state MAS-NMR of boron 11 and nitrogen 15. These studies allowed us to identify a new mechanism of dehydrogenation of ammonia borane for experiments in isothermal conditions
Zhao, Weigang. "Synthèse et caractérisation de matériaux carbonés microporeux pour le stokage de l'hydrogène". Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0093/document.
Texto completo da fonteThis thesis describes the preparation, the characterisation and the performances in terms of hydrogen storage capacity of activated carbons designed for such application. The objective was to develop materials that might be able to meet or approach the storage capacity targeted by the US Department of Energy for 2015, i.e. 5.5 wt. % with respect to the whole storage system. With this aim in view, the researches reported here focused on: (1) investigation and understanding of experimental conditions for preparing such adsorbents; (2) optimization of their porous texture for hydrogen storage; (3) correlations between hydrogen storage capacity and textural parameters (surface area, pore volumes and pore size distributions); (4) investigation of materials doping by nitrogen and metal nanoparticles. Storage capacities of 6.6 % in weight with respect to adsorbent at 77K and 4 MPa on one hand, and of 1 wt. % at 298K and 20 MPa on the other hand, were obtained in the present thesis, among the highest reported so far in the open literature
Capítulos de livros sobre o assunto "Hydrogène – Synthèse (chimie) – Stockage"
DEL MAR SAAVEDRA RIOS, Carolina, Adrian BEDA, Loic SIMONIN e Camélia MATEI GHIMBEU. "Le carbone dur pour les batteries Na-ion : de la synthèse aux performances et mécanismes de stockage". In Les batteries Na-ion, 123–74. ISTE Group, 2021. http://dx.doi.org/10.51926/iste.9013.ch3.
Texto completo da fonteRelatórios de organizações sobre o assunto "Hydrogène – Synthèse (chimie) – Stockage"
Fontecave, Marc, e Candel Sébastien. Quelles perspectives énergétiques pour la biomasse ? Académie des sciences, janeiro de 2024. http://dx.doi.org/10.62686/1.
Texto completo da fonte