Catalysis Today
Catalysis Today
5 years ago

CO2 reduction over Cu-ZnGaMO (M=Al, Zr) catalysts prepared by a sol-gel method: Unique performance for the RWGS reaction

CO2 reduction over Cu-ZnGaMO (M=Al, Zr) catalysts prepared by a sol-gel method: Unique performance for the RWGS reaction
Cu-ZnGaMO (M=Al, Zr) catalysts prepared by a surfactant-free sol-gel method were characterized and tested in the reverse water-gas shift (RWGS) reaction. Their catalytic behavior was analyzed under 0.1–3MPa at 250–325°C and using a reactant mixture of CO2/H2 =1/3. The catalytic results are analyzed in the light of the characteristics of the catalysts. The Cu-ZnGaZrO catalysts were highly selective for the RWGS reaction; a major role of surface copper and interface oxygen vacancies is proposed. CO2 conversion and CO selectivity increased on increasing the reaction temperature. CO2 conversion reaches 16.8% with 99.7% selectivity for CO under 0.1MPa at 325°C over the Cu-ZnGaZrO1 catalyst. It is suggested that CO and methanol production proceed via independent reaction pathways.

Publisher URL: www.sciencedirect.com/science

DOI: S0920586117302511

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