【摘 要】
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The CAS Shanxi Institute of Coal Chemistry (SICC) has developed a CO2 hydrogenation catalyst composed of solid solution structured composite metal oxides and zeolite. The group ⅢA metal elements comprising the composite metal oxides can promote the adsorp
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The CAS Shanxi Institute of Coal Chemistry (SICC) has developed a CO2 hydrogenation catalyst composed of solid solution structured composite metal oxides and zeolite. The group ⅢA metal elements comprising the composite metal oxides can promote the adsorption and dissociation of H2 to form active hydrogen species, while the incorporation of group VIB metal elements can promote the formation of oxygen vacancies on the surface, which can be conducive to the adsorption and activation of CO2 along with the formation of methanol through hydrogenation of the formate/methoxyl intermediates. Consequently methanol can quickly diffuse to the acidic sites of zeolite to form low-carbon olefins which can increase the CO2 conversion rate, andconcurrently suppressing the formation of carboxylate intermediates and reducing the reverse water gas reaction rate, leading to the reduction of the by-product CO formed thereby. The acidic zeolite can decrease the secondary hydrogenation rate of low-carbon olefins and reduce the formation of by-product alkanes.
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