Catalyseurs de nickel Supportés Préparés par la Méthode de l'Hydrazine Aqueuse. Propriétés Hydrogénantes et Stockage d'Hydrogène : Effet du Support. Effet de l'Ajout d'Argent

Abstract : We have studied Ni or NiAg nanoparticles obtained by the reduction of nickel salts (acetate or nitrate) by hydrazine and deposited by simple or EDTA-double impregnation on various supports (g-Al2O3, amorphous or crystallized SiO2, Nb2O5, CeO2 and carbon). Prepared catalysts were characterized by different methods (XRD, XPS, low temperature adsorption and desorption of N2, FTIR and FTIR-Pyridine, TEM, STEM, EDS, H2-TPR, H2-adsorption, H2-TPD, isopropanol decomposition) and tested in the gas phase hydrogenation of benzene or as carbon materials in the hydrogen storage at room temperature and high pressure. The catalysts prepared exhibited better dispersion and activity than classical catalysts. TOF's of NiAg/SiO2 or Ni/carbon catalysts were similar to Pt catalysts in benzene hydrogenation. Differences in support acidity or preparation method and presence of Ag as metal additive play a crucial role in the chemical reduction of Ni by hydrazine and in the final properties of the materials. Ni/carbon catalysts could store significant amounts of hydrogen at room temperature and high pressure (0.53%/30 bars), probably through the hydrogen spillover effect.
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Robert Wojcieszak. Catalyseurs de nickel Supportés Préparés par la Méthode de l'Hydrazine Aqueuse. Propriétés Hydrogénantes et Stockage d'Hydrogène : Effet du Support. Effet de l'Ajout d'Argent. Autre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10023⟩. ⟨tel-01754322⟩

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