A screening for the photo reduction of carbon dioxide supported on metal oxide catalysts for C_1-C_3 selectivity

摘要

Photoreduction of carbon dioxide was performed using a batch reaction system. The catalysts tested were different photoactive materials of metal oxide systems supported on magnesium oxide, aluminum oxide and silicon dioxide. the conversion of carbon dioxide to C_1-C_3 compounds took place preferentially on basic oxide supported systems. Acidic oxide supported catalysts showed more selectivity to C_1 compounds. The trend of C_1-C_3 improved selectivity remained the same, irrespective of the tested photoactive material. X-ray, SEM and reflectance data revealed no change in the characteristics of the photocatalysts during the 6 h of the batch reaction. the reaction mechanism for the formation of C_1-C_3 is discussed.