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题名: Ba effect in doped Sr(Co0.8Fe0.2)O3-delta on the phase structure and oxygen permeation properties of the dense ceramic membranes
作者: Shao, ZP;  Xiong, GX;  Tong, JH;  Dong, H;  Yang, WS
关键词: perovskite ;  phase stability ;  conducting membrane ;  oxygen permeability ;  barium
刊名: SEPARATION AND PURIFICATION TECHNOLOGY
发表日期: 2001-10-01
卷: 25, 期:1-3, 页:419-429
收录类别: ISTP ;  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: BaxSr1-xCo0.8Fe0.2O3-delta (x = 0 similar to 1.0) composite oxides were prepared by a combined EDTA and citrate complexing method. The doping effect of Ba on the phase structure, phase stability and oxygen permeation properties of the mixed conductors was investigated with combined XRD, H-2-TPR, O-2-TPD techniques and oxygen permeation studies. It was found that the perovskite structure was sustained in the whole range of the oxygen activity investigated (0.21 similar to 10(-6) atm) when 0.3 less than or equal to x less than or equal to 0.5. But for the materials with a differed doping content of Ba (x = 0 similar to 0.1, 0.7 similar to 1.0), a phase transition was accompanied which was deleterious to the integrality of the membrane during operation. The relationship of phase structure and stability with tolerance factor was proposed. The doping of Ba in Sr(Co0.8Fe0.2)O3-delta could not lead to the improvement of these materials in the resisting of reduction, but the synergetic effect between cobalt and iron in the material was improved. Considerable high oxygen permeation rates were found for the BSCFO membranes in the whole range of Ba doping content. The Ba0.3Sr0.7Co0.8Fe0.2O3-delta membrane had the highest oxygen permeation flux, (1.19 ml/cm(2) min for 1.50 mm thickness membrane at 850 degreesC), the lowest activation energy for oxygen transportation (37.8 KJ/mol at the temperature range of 731 degreesC similar to 950 degreesC), and the lowest critical temperature for the change in the activation energy (731 degreesC). (C) 2001 Elsevier Science B.V. All rights reserved.
关键词[WOS]: ELECTRICAL-CONDUCTIVITY ;  PEROVSKITE ;  PERMEABILITY ;  STABILITY ;  REACTORS ;  METHANE ;  LACOO3 ;  OXIDES ;  GAS
语种: 英语
WOS记录号: WOS:000171837900046
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138872
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,Xiong, GX,Tong, JH,et al. Ba effect in doped Sr(Co0.8Fe0.2)O3-delta on the phase structure and oxygen permeation properties of the dense ceramic membranes[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2001,25(1-3):419-429.
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