Efficient CO2 to CO conversion at moderate temperatures enabled by the cobalt and copper co-doped ferrite oxygen carrier

Chemical looping technology holds great potential on efficient CO2 splitting with much higher CO production and CO2 splitting rate than photocatalytic processes. Conventional oxygen carrier requires high temperature (typically 850-1000 degrees C) to ensure sufficient redox activity, but the stable and high CO2 conversion is favored at a lower temperature, leading to the degrading on the reaction kinetics as well as the low CO production and CO2 splitting rate. In this paper, we prepared several ternary spinels and demonstrated their performance for chemical looping CO2 splitting at moderate temperatures. Using the promotion effect of Cu to cobalt ferrite reduction and reversible phase change of the reduced metals, Cu 0.4 Co 0.6 Fe2O4 exhibits high CO2 splitting rate (similar to 144.6 mu mol g(-1) min(-1)) and total CO production (similar to 9100 mu mol g(-1)) at 650 degrees C. The high performance of this earth-abundant spinel material is also consistent in repeated redox cycles, enabling their potential in industrial use. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.