Photothermal catalytic CO2 hydrogenation over a Mg-doped In2O3-x catalyst
To improve the catalytic activity of the photothermal CO2 hydrogenation In2O3 catalyst,a Mg(OH)2-In(OH)3 precursor was prepared by the homogeneous hydrothermal method,and a Mg-doped In2O3-x(Mg-In2O3-x)catalyst enriched with oxygen vacancies was obtained by the following high-temperature calcination and H2-reducing treat-ment.The catalyst was evaluated for its photothermal catalytic performance of CO2 hydrogenation in a photothermal fixed-bed reactor.The results demonstrated that Mg-In2O3-x achieved an impressive CO2 conversion rate of 31.20％with a CO production rate of 14.22 mmol·gcat-1·h-1 and selectivity of 100％in the light reaction at 300 ℃.The char-acterization results confirmed that the Mg doping into the In2O3 lattice promotes the formation of more surface oxy-gen vacancies,which dramatically increases the response efficiency to visible light and slows down the recombina-tion of photogenerated electron-hole.This is the main reason for the enhancement of the photothermal catalytic per-formance.
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