Synergistic Enhanced Ca-Fe Chemical Looping Reforming Process for Integrated CO2 Capture and Conversion

CO2 capture and CO2 conversion are two promising methods to mitigate the severe climate change. However, limited integration between these two techniques makes them less attractive and convincing. In this work, by using Fe2O3 as an oxygen carrier and CaO as a CO2 sorbent, a Ca-Fe chemical looping reforming process for integrated CO2 capture and conversion was demonstrated. Compared to that of single reforming processes, its reforming performance is significantly enhanced because of the synergistic effect from solid interaction and gas side reactions. The addition of the oxygen carrier is beneficial for fast CaCO3 decomposition based on Le Chatelier's principle, while the CO2 sorbent supplies the oxygen source for replenishing the oxygen carrier to improve the activity. Spinel FeAl2O4 formation deteriorates oxygen capacity and reforming reactivity, and particle agglomeration and carbon deposit are the potential factors for material deactivation. This process offers a new route to link CO2 capture with CO2 conversion in an in situ fashion.