Key Words:CARBON-DIOXIDE; REACTION PATHWAY; SELECTIVITY; REDUCTION; SITES; GAS

Abstract:Controlling metal-support interaction is critical when constructing a highly efficient catalytic system. Herein, different Cu-CeO<INF>x</INF> interactions are realized by preparing a sequence of CuO/MnCeO<INF>x</INF> catalysts with varying Mn content. The impact of Mn content on the behavior of CuO/MnCeO<INF>x</INF> catalysts during the hydrogenation of CO<INF>2</INF> to CH<INF>3</INF>OH is analyzed to determine the optimum Mn content. The catalyst with 20% Mn content (CuO/Mn<INF>0.2</INF>CeO<INF>x</INF>) exhibits optimal catalytic behavior with a methanol space-time yield of 0.25 g<INF>CH<INF>3</INF>OH</INF> g<INF>cat</INF><SUP>-1</SUP> h<SUP>-1</SUP> at 260 degrees C. The CuO/Mn<INF>0.2</INF>CeO<INF>x</INF> sample exhibits the highest catalytic activity as it has the highest concentration of oxygen vacancies and Cu<SUP>0</SUP> as well as medium-to-strong basic sites, which are generated by the strongest metal-support interactions between CuO and MnCeO<INF>x</INF> solid solution. In situ diffuse reflectance infrared Fourier-transform spectroscopy evidence indicates that the CO<INF>2</INF> methanolization over CuO/MnCeO<INF>x</INF> catalysts proceeds via a formate mechanism. The results obtained herein are highly significant for controlling oxygen vacancies and surface basic sites by rationally altering the metal-support interaction to develop new, highly efficient CO<INF>2</INF> hydrogenation catalysts.

Volume:8

Issue:6

Translation or Not:no