Chemical looping conversion of coal (CLCC), an innovative technology, is an efficient and clean way for the utilization of coal. Oxygen carrier (OC) reduction by the coal is the rate-limiting process for the CLCC with deep OC reduction. K-decorated Fe₂O₃/Al₂O₃ OC, found to be a promising OC, can increase the reaction rate of OC and char. Unfortunately, due to the complexity of the OC the preparation conditions on the performance of this composite OC were not clear. In this study, the effect of Al₂O₃ content and calcination temperature on the activity and stability of Fe-based OC were investigated by thermogravimetric analysis (TGA), H₂ temperature-programmed reduction (TPR), N₂ adsorption analyzer, X-ray diffraction (XRD) and scanning electron microscope (SEM). The impact of K₂CO₃ loadings on the reactivity and stability of OC was also studied in a fix-bed reactor. In addition, optimal preparation conditions were screened out. The results showed that Al₂O₃ could increase the specific surface area of OC and anti-sintering ability. However, the Al₂O₃ had an adverse impact on the mechanical strength and reactivity of OC. The increase of calcination temperature of OC could increase the mechanical strength but decrease the reactivity of OC. The loading of K₂CO₃ could significantly improve the reactivity of OC, and K₂CO₃ was favorable for the redox stability of OC. The optimal preparation conditions of the composite OC are as follows: the addition amount of Al₂O₃ was 30%, the addition amount of K₂CO₃ was 5%, and the calcination temperature of OC was 1030 °C.

煤的化学循环转化（CLCC）是一项创新技术，是一种高效清洁的煤炭利用方式。煤对载氧体 (OC) 的还原是 CLCC 深度 OC 还原的限速过程。K修饰的Fe ₂ O ₃ /Al ₂ O ₃ OC，被发现是一种很有前途的OC，可以提高OC和炭的反应速率。不幸的是，由于 OC 的复杂性，对这种复合 OC 性能的制备条件尚不清楚。本研究通过热重分析 (TGA)、H ₂研究了 Al ₂ O ₃含量和煅烧温度对 Fe 基 OC 活性和稳定性的影响。程序升温还原 (TPR)、N ₂吸附分析仪、X 射线衍射 (XRD) 和扫描电子显微镜 (SEM)。还在固定床反应器中研究了 K ₂ CO ₃负载量对 OC 的反应性和稳定性的影响。此外，筛选出最佳制备条件。结果表明，Al ₂ O ₃可以增加OC的比表面积和抗烧结能力。然而，Al ₂ O ₃对OC的机械强度和反应性有不利影响。OC 煅烧温度的升高可以提高 OC 的机械强度，但会降低 OC 的反应活性。K ₂ CO的负载量₃能显着提高OC的反应活性，K ₂ CO ₃有利于OC的氧化还原稳定性。复合OC的最佳制备条件为：Al ₂ O ₃添加量为30%，K ₂ CO ₃添加量为5%，OC的煅烧温度为1030℃。