Valorisation énergétique de CO₂ via la méthanation par voie catalytique

Abstract : This study concerns the valorization of carbon dioxide by the methanation process. It aims to develop effectiv catalysts for this reaction. The active species is metallic nickel. Different supports have been studied such as SiO₂, Al₂O₃, MgO, Y₂O₃ and CeO₂. These catalysts were prepared by the dry impregnation method. Initially, the different catalysts were characterized by different physicochemical techniques including X-ray Diffraction (XRD), Temperature Programmed Reduction (TPR-H₂), Temperature Programmed Desorption (TPD-CO₂), nitrogen adsorption (BET method) and hydrogen chemisorption. In a second step, the various catalysts thus prepared were tested in the CO₂ methanation reaction. The Ni/CeO₂ catalysts has the best catalytic performance, among the systems studied. The addition of ruthenium improves the catalytic activity and the stability of the catalysts. The catalyst Ru(0.5%)-Ni(5%)/CeO₂ is the most efficient, it has good catalytic activity and good stability even as a pressure of 10 bar. This makes it advantageous for an industrial application.
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Nathalie Elia. Valorisation énergétique de CO₂ via la méthanation par voie catalytique. Catalyse. Université du Littoral Côte d'Opale; Université de Balamand (Tripoli, Liban), 2019. Français. ⟨NNT : 2019DUNK0505⟩. ⟨tel-02124308⟩

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