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Elaboration et caractérisations de nanoparticules supportées par des matériaux poreux pour le stockage de l’hydrogène produit par électrolyse de l’eau

Abstract : The thesis manuscript deals with a topical issue, related to the valorization of porous materials, like clays and zeolites to solve the energy problems. The research carried out concerns more precisely the improvement of the adsorptive properties of bentonites, with a view to their use in gas retention processes. Firstly, development of an economic method to dissociated water for hydrogen production. Secondly, the reversible capture for hydrogen storage. The solutions envisaged in the work of this doctoral thesis propose in a first part a study of the parameters influencing the conversion efficiency of the luminous energy and then the chemical energy for the water dissociation into oxygen and hydrogen. The effects of the height-base ratio of the electrolysis cell, the temperature of the electrolyte, the time, the salinity, the pH and the nature of the electrolyte are investigated. In a second part, which has been the subject of intense experimentation, modifications of clay surfaces and mesoporous silica like SBA-15 and SBA-16 by insertion of dendrimers can (i) encapsulate copper and palladium nanoparticles and (ii) generate adsorption sites to retain hydrogen by weak interactions, thus allowing its subsequent release by simple forced convection, without requiring heating. As a result, the modification procedures involved an intensification of these interactions to obtain economic, recyclable, non-polluting and high added-value adsorbents. The storage of hydrogen in such porous matrices is a major problem in view of the urgent need to find substitutes for polluting and exhaustible fossil energy sources. This makes it a major problem to be solved first. Highlighting the possibility of modifying the clays at lower cost will surely increase the interest in furthering research in this direction.
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Submitted on : Wednesday, December 5, 2018 - 12:01:10 PM
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Nabil Bouazizi. Elaboration et caractérisations de nanoparticules supportées par des matériaux poreux pour le stockage de l’hydrogène produit par électrolyse de l’eau. Matériaux. Université de Monastir; Université de Québec à Montréal, 2016. Français. ⟨tel-01945438⟩

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