期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 45, 期 2, 页码 3305-3314出版社
WILEY
DOI: 10.1002/er.6026
关键词
chemical looping; NiFe2O4; phase segregation; reduction degree
资金
- National Natural Science Foundation of China [52006091]
- China Postdoctoral Science Foundation [2020TQ0128]
This study investigated the phase segregation mechanism of NiFe(2)O(4) in chemical looping processes, with reduction degree playing a significant role in influencing stability. The results showed that phase segregation was the main reason for deactivation of NiFe(2)O(4) instead of surface sintering. This research provides guidance for the development of NiFe2O4-based oxygen carriers with high redox performance.
NiFe(2)O(4)presents high redox activity and good promoted application prospect in chemical looping processes. However, phase segregation caused by outward diffusion of Fe cations often lead to low cycling stability for NiFe2O4. In this study, the inherent mechanism of phase segregation for NiFe(2)O(4)was investigated deeply. The results indicated that reduction degree exhibited significant influence on the phase segregation of NiFe(2)O(4)in successive redox cycles. When NiFe(2)O(4)was reduced to Ni and Fe(3)O(4)in redox cycles, NiFe(2)O(4)displayed stable redox activity without phase segregation. As the reduction degree reached to FeO and FeNi, a needle-like structure with Fe enrichment was formed on the surface of the first cycled NiFe2O4. In the subsequent redox cycles with deep reduction degree, both severe phase segregation and deactivation were occurred for spent NiFe(2)O(4)sample. It can be seen that phase segregation is the main reason for the deactivation of NiFe(2)O(4)instead of surface sintering in redox cycles. The results of this work provide guidance for the development of NiFe2O4-based oxygen carriers with high redox performance.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据