Efficient CO 2 conversion to CO using chemical looping over Co-In oxide.

CO 2 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 CO 2 . In this study, Co-In 2 O 3 was developed as an oxygen storage material (OSM) that can realize an efficient RWGS-CL process. Co-In 2 O 3 showed a high CO 2 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 CO 2 conversion in the CO 2 splitting step ( ca. 80%) was much higher than the equilibrium conversion of catalytic RWGS in the mid-temperature range, indicating that Co-In 2 O 3 is a suitable OSM for the RWGS-CL process.