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题名: Investigation of the permeation behavior and stability of a Ba0.5Sr0.5Co0.8Fe0.2O3-delta oxygen membrane
作者: Shao, ZP;  Yang, WS;  Cong, Y;  Dong, H;  Tong, JH;  Xiong, GX
关键词: inorganic membrane ;  Ba0.5Sr0.5Co0.8Fe0.2O3-delta ;  perovskite ;  oxygen separation ;  phase stability
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2000-07-01
卷: 172, 期:1-2, 页:177-188
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Polymer Science
研究领域[WOS]: Engineering ;  Polymer Science
英文摘要: SrCo0.8Fe0.2O3-delta (SCFO) and Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCFO) oxides were successfully prepared, using a combined citrate-EDTA complexing method. The results of O-2-TPD and XRD showed that the introduction of barium into SCFO could effectively suppress the oxidation of Co3+ and Fe3+ to higher valence states of Co4+ and Fe4+ in the lattice, and stabilize the perovskite structure under lower oxygen partial pressures. Oxygen permeation experiment showed that BSCFO membrane also had higher oxygen permeation flux than that of SCFO under air/He oxygen partial pressure gradient. At 950 degrees C, the permeation flux through 1.80 mm BSCFO membrane exposed to flowing predried air (P-O2' = 0.21 atm) and helium (P-O2" = 0.037 atm) is ca. 1.4 ml/cm(2) min and the activation energy for oxygen transportation is 40.9 kJ/mol within the temperature range of 775-950 degrees C. The permeation flux of BSCFO was less sensitive to minor amounts of CO2 and water vapor presented in the air than that of SCFO. Long-term oxygen permeation study of more than 1000 h at 850 degrees C indicated that the BSCFO membrane could operate stably as an oxygen generator at that temperature. A very slow exponential decay in the measured oxygen permeation flux occurred at temperatures lower than 825 degrees C, which was caused by a phase transition. The phase transition was found to be reversible at higher temperatures, but a long time was needed for the equilibration. (C) 2000 Elsevier Science B.V. All rights reserved.
关键词[WOS]: MIXED-CONDUCTING OXIDES ;  PARTIAL OXIDATION ;  METHANE ;  REACTORS ;  SYNGAS ;  GAS ;  SRCO0.8FE0.2O3-DELTA ;  PERMEABILITY ;  PEROVSKITES ;  CONVERSION
语种: 英语
WOS记录号: WOS:000087289200017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138821
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

Recommended Citation:
Shao, ZP,Yang, WS,Cong, Y,et al. Investigation of the permeation behavior and stability of a Ba0.5Sr0.5Co0.8Fe0.2O3-delta oxygen membrane[J]. JOURNAL OF MEMBRANE SCIENCE,2000,172(1-2):177-188.
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