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题名: Oxygen permeation study in a tubular Ba0.5Sr0.5Co0.8Fe0.2O3-delta oxygen permeable membrane
作者: Wang, HH;  Cong, Y;  Yang, WS
关键词: dense tubular membrane ;  oxygen separation ;  inorganic membrane ;  perovskite ;  mixed-conducting
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2002-12-15
卷: 210, 期:2, 页:259-271
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: Dense tubular Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCFO) membranes were successfully prepared by the plastic extrusion method. The oxygen permeation flux was determined at different oxygen partial pressures in the shell side and different temperatures between 700 and 900 degreesC. The oxygen vacancy diffusion coefficients (Dv) at different temperatures were calculated from the dependence of oxygen permeation flux on the oxygen partial pressure term based on the surface current exchange model. No unsteady-state of oxygen permeation flux was observed at the initial stage in our experiments. The reason is the equilibrium time is too short (less than 10 min) to observe the unsteady-state in time. The increase of the helium flow rate can increase the oxygen permeation flux, which is due to the decrease of the oxygen partial pressure in the tube side with increasing of the helium flow rate. The oxygen permeation flux can also be affected by the air flow rate in the shell side when the air flow rate is lower than 150 ml/min. But the oxygen permeation flux is insensitive to the air flow rate when the air flow is higher than 150 ml/min. The membrane tube was operated steadily for 150 It with oxygen permeation flux of 1.12 ml/(cm(2) min) at 875 degreesC. X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) analysis showed that both the surface exposed to air and the surface exposed to helium of the BSCFO membrane tube after permeation for 150 h are similar to the fresh membrane tube in composition and structure. These results indicated that the membrane tube exhibits high structure stability. (C) 2002 Elsevier Science B.V. All rights reserved.
关键词[WOS]: CERAMIC MEMBRANE ;  PARTIAL OXIDATION ;  METHANE ;  REACTOR ;  SYNGAS ;  OXIDES ;  GAS
语种: 英语
WOS记录号: WOS:000179551900006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139140
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:
Wang, HH,Cong, Y,Yang, WS. Oxygen permeation study in a tubular Ba0.5Sr0.5Co0.8Fe0.2O3-delta oxygen permeable membrane[J]. JOURNAL OF MEMBRANE SCIENCE,2002,210(2):259-271.
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