Dopant Effect of Barium Zirconate-Based Perovskite-Type Catalysts for the Intermediate-Temperature Reverse Water Gas Shift Reaction

The reverse water gas shift (RWGS) reaction catalyzed by barium zirconate-based perovskite-type catalysts doped with Y, Zn, and Ce was investigated in terms of activities and chemical stabilities of various catalysts. All of the catalysts showed stable performances for the RWGS reaction at 600 °C for 5 h, and in particular, the BaZr 0.8 Y 0.16 Zn 0.04 O 3 (BZYZ) catalyst showed an outstanding activity with an average CO 2 conversion of 37.5% and a CO selectivity of 97%. Insertion of additional Ce into the BZYZ structure did not have any positive effect on catalytic activity for the RWGS reaction, even though the ionic conductivity of BZYZ was improved by Ce insertion.