期刊
MATERIALS LETTERS
卷 93, 期 -, 页码 129-132出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2012.09.039
关键词
CeO2; Fe2O3; Oxygen storage capacity; Redox; CeFeO3
资金
- New Energy and Industrial Technology Development Organization (NEDO) of Japan [8023]
- National Nature Science Foundation of China [51004060]
The modifications of CeO2 on the reduction behavior, oxygen storage capacity (OSC), and redox stability of Fe2O3 were investigated. Combination of Fe2O3 with CeO2 strongly improved the low-temperature reducibility of both Fe2O3 and CeO2, evidencing an obvious interaction between cerium and iron oxides during the H-2-TPR process. Most of the Fe3+ in single Fe2O3 cannot be restored by the re-oxidation step (OSC step) after the TPR testing, which resulted in a serious decrease in the OSC. On the other hand, the presence of CeO2 significantly enhanced the redox property of Fe2O3: more iron (III) ions were observed in the recycled CeO2/Fe2O3 mixture (Ce/Fe=1/4, labeled Ce20Fe80 sample), and the OSC was obviously improved by the redox treatment. After the first TPR/OSC cycle, the reduction behavior of the recycled Ce20Fe80 sample is highly reversible, indicating good redox stability. This is attributed to the formation of perovskite-type CeFeO3 with excess CeO2, Fe2O3 and Fe in the recycled Ce20Fe80 sample. (C) 2012 Elsevier B.V. All rights reserved.
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