Abstract: A metal oxide oxygen carrier of Cu-Ni/Al2O3 was prepared by a mechanical mixing method, and its cycle performance investigated in a fixed bed reactor based on a new chemical-looping combustion process. The results showed that the fresh Cu-Ni/Al2O3 exhibited an excellent performance. However, the oxidation rate of oxygen carrier decreased from 91.0% in the first cycle to 27.7% in the 120th cycle. In contrast, the reduction rate of oxygen carrier decreased mildly, and maintained 86.8% in the 120th cycle. According to the characterization of the degraded Cu-Ni/Al2O3, the main reason for the performance degradation of the oxygen carrier was speculated to be the powdering of Cu-Ni/Al2O3 particles and local aggregation of the powdered fine particles. Through re-granulating the degraded oxygen carrier, the performance of Cu-Ni/Al2O3 was recovered to a level close to the initial performance.

Key words: Cu-based oxygen carrier, chemical looping combustion, cycle life

摘要： 采用机械混合法制备了Cu-Ni/Al2O3载氧体，并基于新型化学链燃烧工艺对其循环性能进行测试. 结果表明，Cu-Ni/Al2O3的初期反应性能良好，但随循环次数增加氧化率迅速降低，从初期的91.0%降至循环120次时的27.7%，而还原率则衰减轻微，循环120次仍维持在86.8%. 载氧体循环性能的衰减主要是颗粒粉化和粉化后细微颗粒团聚引起的，重新造粒可使其循环性能恢复到接近初期水平.

关键词: Cu基载氧体, 化学链燃烧, 循环寿命