Efficient CO2 conversion to CO using chemical looping over Co–In oxide

CO2 conversion to CO by reverse water-gas shift using chemical looping (RWGS-CL) can be conducted at lower temperatures (ca. 723–823 K) than the conventional catalytic RWGS (>973 K), and has been attracting attention as an efficient process for CO production from CO2. In this study, Co–In2O3 was developed as an oxygen storage material (OSM) that can realize an efficient RWGS-CL process. Co–In2O3 showed a high CO2 splitting rate in the mid-temperature range (723–823 K) compared with previously reported materials and had high durability through redox cycles. Importantly, the maximum CO2 conversion in the CO2 splitting step (ca. 80%) was much higher than the equilibrium conversion of catalytic RWGS in the mid-temperature range, indicating that Co–In2O3 is a suitable OSM for the RWGS-CL process.