A high-performance oxygen carrier with high oxygen transport capacity and redox stability for chemical looping combustion

Abstract

Oxygen carrier with high oxygen transport capacity and redox stability can greatly decrease material usage and maintain the stable system operation in chemical looping combustion. However, the trade-off between two aspects must be considered because operating the material at the high oxygen transport capacity often leads to severe sintering. Herein, we reported NiFeAlOx material as an oxygen carrier and investigated its chemical looping combustion performance. The results showed that it had an average oxygen transport capacity of 2.37 mmol/g and good stability during 20 cycles. In contrast, conventional Fe2O3 and FeAlOx material exhibited the transport capacity of 1.07 mmol/g and 0.78 mmol/g respectively. The higher transport capacity and redox stability enable the CO2 yield of 2.37 mmol/g in terms of nearly 100% capture efficiency. Through various characterization techniques, we found the high performance of this material was due to reversible exsolution and dissolution between the active compounds and the parent spinel support.