The Catalytic Performance of Ga2O3-CeO2 Composite Oxides over Reverse Water Gas Shift Reaction

The conversion of CO2 into other C1 raw materials is considered to be the best way to solve the greenhouse effect and energy crisis. Reverse water gas shift (RWGS) reaction is the best way to obtain high value-added product raw material syngas and its reactor can be realized in any heavy carbon industry. Here, a series of Ga2O3 CeO2 composite oxide catalysts with different ratios of Ga2O3 and CeO2 were developed by gel sol-gel method. Compared with pure Ga2O3, CeO2, the composite oxides catalysts have smaller grains and exhibit excellent selectivity of CO in RWGS reaction. It was found that Ga2O3 has different reaction intermediates compared with CeO2 and Ga2O3 CeO2, so it is easy to produce methane under high H-2 conditions, while CeO2 is beneficial to improve the selectivity of CO. Therefore, Ga2O3 CeO2 has the potential to serve as a new and highly selective catalyst for reverse water gas shift reaction.