摘要：Mesoporous M‐CeO2 (M = Ni, Co, Fe, Mn, and Cu) catalysts were prepared using the hard‐template method and applied to investigate CO2 reverse water‐gas shift (RWGS) reaction. The physicochemical properties were studied using H2‐TPR, XRD, BET, CO2‐TPD, and H2‐TPD. Results show that the specific surface areas of the prepared Ni‐CeO2, Co‐CeO2, Fe‐CeO2, Mn‐CeO2, and Cu‐CeO2 catalysts exceed 120 m2/g. CO2 RWGS reaction performances are affected by the d‐orbital holes of transition metals. CO2 RWGS reaction catalytic activities are ranked as follows: Ni‐CeO2 > Cu‐CeO2 > Co‐CeO2 > Fe‐CeO2 ≈ Mn‐CeO2. The Cu‐CeO2, Fe‐CeO2, and Mn‐CeO2 catalysts maintain 100 % CO selectivity at the studied temperature.
The d‐orbital holes of transition metals can improve the absorption performance of the M‐CeO2 catalysts for the reactants to promote the activation of the CO2 and H2 molecules, resulting in the improved CO2 RWGS reaction performances on the corresponding catalyst.
