A high-performance oxygen carrier with high oxygen transport capacity and redox stability for chemical looping combustion. (15th December 2019)

• Record Type: Journal Article
• Authors: Cui, Dongxu; Qiu, Yu; Lv, Yulin; Li, Min; Zhang, Shuai; Tippayawong, Nakorn; Zeng, Dewang; Xiao, Rui
• Is Part Of: Energy conversion and management. Volume 202(2019)
• Publication Date: 2019-12-15
• Subjects: Oxygen transport capacity -- Redox stability -- Chemical looping combustion -- Phase transition; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2019.112209
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: The NiFeAlOx spinel is prepared as an oxygen carrier material. Reversible exsolution and dissolution improve redox stability. The material has exhibited good redox stability at high oxygen transport capacity. 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 Fe2 O3 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.