Chemical Looping Combustion for Coupling with Efficient CO2 Capture and Utilization: Stable Oxygen Carriers and Carbon Cycle

The capture of CO2 with chemical looping combustion (CLC) offers a novel approach to significantly reduce carbon emissions while simultaneously utilizing captured CO2 as a valuable resource by leveraging its inherent CO2 separation capability. The separation of CO2 in CLC technology achieves low-cost CO2 capture through the utilization of highly efficient oxygen carriers (OC), enabling the coupling of CO2 capture with subsequent hydrogenation reactions for high-value-added chemical production. This review comprehensively summarizes the principle of the CLC technology, the current status of OC research, and the potential for CO2 capture in chemical synthesis, providing theoretical insights into the feasibility of activating and utilizing CO2 within practical industrial processes. The stable OC brought about excellent properties and higher application value in the long term operation. The careful selection of a stable OC and the rational design of oxygen vacancies are the keys to enable this technology; however, further research is needed to develop a highly efficient and stable OC to optimize the CO2 capture efficiency and product yields while elucidating the underlying reaction mechanisms.