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题名: The Role of A-Site Ion Nonstoichiometry in the Oxygen Absorption Properties of Sr1+xCo0.8Fe0.2O3 Oxides
作者: He, Yufeng1, 2;  Zhu, Xuefeng1;  Yang, Weishen1
关键词: absorbents ;  oxygen separation ;  absorption capacity ;  desorption rate ;  stability
刊名: AICHE JOURNAL
发表日期: 2011
DOI: 10.1002/aic.12246
卷: 57, 期:1, 页:87-95
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: Sr1+xCo0.8Fe0.2O3 (0.2 <= x <= 0.1) oxides have been synthesized and investigated as potential oxygen absorbents for high temperature oxygen separation processes. It was found that the A-site ion deficient Sr0.95Co0.8Fe0.2O3 and Sr0.9Co0.8Fe0.2O3 oxides have larger oxygen absorption capacities, and slightly higher oxygen desorption rates. However, the A-site ion excess Sr1.05Co0.8Fe0.2O3 and Sr1.1Co0.8Fe0.2O3 exhibited much higher oxygen desorption rates, but smaller oxygen absorption capacities. The oxygen absorption capacities were further verified using oxygen temperature-programmed desorption technique, and the oxygen desorption rates were well described by a pseudo-second-order kinetics model. In addition, the long-term stability of Sr0.9Co0.8Fe0.2O3 was investigated for 280 h (1120 loops) with switching between oxygen absorption and desorption. The excellent stability was confirmed by X-ray diffraction patterns which suggested that the cyclic processes of oxygen absorption and desorption took place between the perovskite structure with disordered oxygen vacancies and the brownmillerite structure with ordered oxygen vacancies. (C) 2010 American Institute of Chemical Engineers AIChE J, 57: 87-95, 2011
关键词[WOS]: LANTHANUM COBALTITE PEROVSKITE ;  SORPTIVE PROPERTIES ;  CERAMIC MEMBRANES ;  AIR SEPARATION ;  FUEL-CELLS ;  PERMEATION ;  PERFORMANCE ;  CAPABILITY ;  KINETICS ;  EQUILIBRIUM
语种: 英语
WOS记录号: WOS:000285396300008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142574
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

Recommended Citation:
He, Yufeng,Zhu, Xuefeng,Yang, Weishen. The Role of A-Site Ion Nonstoichiometry in the Oxygen Absorption Properties of Sr1+xCo0.8Fe0.2O3 Oxides[J]. AICHE JOURNAL,2011,57(1):87-95.
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