Abstract：To solve the reduction-resistant and stabilization of the catalyst under the condition of reverse water gas shift reaction(RWGS), Mn-based catalysts were prepared by wet impregnation and co-precipitation, respectively. Thermodynamic analysis of RWGS reaction and preliminary screening of catalyst were performed. The effects of temperature, pressure, H2/CO2 volume ratio and space velocity on catalytic activity were tested, and long-term testing of catalyst were also evaluated. The results suggested that the catalysts prepared by co-precipitation are better than those prepared by impregnation. The optimal reaction condition of RWGS was temperature of 550—600 ℃, pressure of 0.1—0.5 MPa, H2/CO2 volume ratio of 1—1.5, space velocity of 10 000—15 000 h-1. CO2 conversion of 45% and CO selectivity of 90% were obtained at an inlet temperature of 580 ℃, reaction pressure of 0.5 MPa, H2/CO2 volume ratio of 1.5 and space velocity of 6 000 h-1. RWGS stability testing showed good stability of the prepared catalysts and no deactivation after 500 h operation which due to the formation of Mn-contained spinel phase in the catalysts.
