Photocatalytic CO2 reduction is an extremely important process for converting CO2 into valuable chemicals. However, the reaction is less and less efficient at low temperature. The combination of photo and thermal conditions is one of the workable approaches to achieve the reaction with high efficiency and has recently received a lot of attention. In the present work we prepared several Co-Cu-Mn trimetal oxide catalysts via the simple coprecipitation method, which were used to catalyze the photothermal reduction of CO2 to hydrocarbons. The metal composition and the reduction temperature of the catalysts had very important effects on their structural and photoelectric properties, which further led to different catalytic performances. Among the trimetal oxide catalysts, the Co7Cu1Mn1Ox (200) catalyst with a Co / Cu / Mn molar ratio of 7/1/1 and 2 h at 200 ° C in H2 was able to reduce CH4 with an activity of 14.5 mmol gcat. produce -1 · h-1 in a CO2 / H2 / N2 atmosphere and CH4 and C2 + hydrocarbons with an activity of 15.9 and 7.9 mmol · gKat-1 · h-1 under a CO2 / H2 atmosphere. The present strategy for the construction of trimetal oxide catalysts in photothermal reactions not only provides a highly active catalyst for CO2 utilization, but also offers a potential opportunity to lower the high temperatures for conventional thermal reactions.

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