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题名: Oxygen permeability and stability of Ba0.5Sr0.5Co0.8Fe0.2O3-delta as an oxygen-permeable membrane at high pressures
作者: Lu, H;  Cong, Y;  Yang, WS
关键词: membrane ;  oxygen permeability ;  diffusion coefficients ;  ionic conductivity ;  stability
刊名: SOLID STATE IONICS
发表日期: 2006-02-01
DOI: 10.1016/j.ssi.2005.10.030
卷: 177, 期:5-6, 页:595-600
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Condensed Matter
研究领域[WOS]: Chemistry ;  Physics
英文摘要: Oxygen permeation fluxes across the dense Ba0.5Sr0.5Co0.8Fe0.2O3-delta, (BSCFO) membrane disks were measured under an air/helium oxygen partial pressure gradient at high pressures (up to 10 atm) and various temperatures (973-1123 K). The fabricated BSCFO membrane exhibited good oxygen permeability with a high oxygen permeation flux of 2.01 ml min(-1)cm(-2) (thickness: 1.37 mm) at 1123 K and 10 atm. Oxygen permeation results were analyzed theoretically using the surface exchange current model. The dependences of the oxygen permeation fluxes on the oxygen partial pressure gradient, suggested that the bulk oxygen ionic diffusion was the rate-limiting step for the overall oxygen permeation process across the BSCFO membrane. The ambipolar diffusion coefficients (D-a), the oxygen vacancy diffusion coefficients (D-a) and the oxygen ionic conductivities (sigma(i)) of the BSCFO material at different temperatures (973-1123 K) were calculated. It was found that BSCFO possessed high oxygen diffusion coefficients and ionic conductivities, which resulted in the good oxygen permeability of BSCFO. In addition, the BSCFO membrane exhibited good stability of oxygen permeation at 1123 K, while the deterioration of oxygen permeation stability was observed at 1098 K due to structural changes occurring at the surface of the BSCFO membrane disk as demonstrated by XRD. (c) 2005 Elsevier B.V. All rights reserved.
关键词[WOS]: PEROVSKITE-TYPE OXIDES ;  PARTIAL OXIDATION ;  CONDUCTING MEMBRANES ;  PERMEATION ;  METHANE ;  TRANSPORT ;  REACTOR ;  SYNGAS ;  CONVERSION ;  DIFFUSION
语种: 英语
WOS记录号: WOS:000236301000024
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140182
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.Univ Sci & Technol Lille, Ecole Natl Super Chim Lille, CNRS, UMR 8012,Lab Cristallochim & Physiochim Solide, F-59652 Villeneuve Dascq, France

Recommended Citation:
Lu, H,Cong, Y,Yang, WS. Oxygen permeability and stability of Ba0.5Sr0.5Co0.8Fe0.2O3-delta as an oxygen-permeable membrane at high pressures[J]. SOLID STATE IONICS,2006,177(5-6):595-600.
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