Re-evaluation of Ba0.5Sr0.5Co0.8Fe0.2O3-delta perovskite as oxygen semi-permeable membrane

Zeng, PY, Chen, ZH, Zhou, W, Gu, HX, Shao, ZP and Liu, SM (2007) Re-evaluation of Ba0.5Sr0.5Co0.8Fe0.2O3-delta perovskite as oxygen semi-permeable membrane. Journal of Membrane Science, 291 1-2: 148-156. doi:10.1016/j.memsci.2007.01.003

Author Zeng, PY
Chen, ZH
Zhou, W
Gu, HX
Shao, ZP
Liu, SM
Title Re-evaluation of Ba0.5Sr0.5Co0.8Fe0.2O3-delta perovskite as oxygen semi-permeable membrane
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
Publication date 2007
Sub-type Article (original research)
DOI 10.1016/j.memsci.2007.01.003
Volume 291
Issue 1-2
Start page 148
End page 156
Total pages 9
Place of publication Amsterdam
Publisher Elsevier Science Bv
Collection year 2008
Language eng
Subject 290603 Membrane and Separation Technologies
Division 2 - Economic Development
660303 Energy storage
Abstract Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF), a mixed oxygen ionic and electronic conducting ceramic derived from SrCo0.8Fe0.2O3-delta (SCF), was re-evaluated for its possible application as an oxygen semi-permeable membrane and membrane reactor for partial oxidation of light hydrocarbons. The partial substitution of Sr2+ with Ba2+ in SCF led to an increase in the phase stability of the cubic perovskite structure. Both BSCF and SCF were found to have high oxygen nonstoichiometry. However, BSCF possessed a higher oxygen nonstoichiometry than SCF at room temperature, but a similar value at high temperatures. This resulted in the lower chemical expansion for BSCF than SCE The doping of Ba2+ in SCF led to the decrease of the electronic conductivity, but an increase in the oxygen ionic conductivity. The oxygen permeation study of the BSCF membrane demonstrated that the permeation rate was mainly rate-determined by the slow surface exchange kinetics at the oxygen lean side (or reaction side) membrane surface. The high ionic conductivity and the slow surface exchange kinetics resulted in the surface oxygen partial pressure at the reaction side membrane surface to be much higher than the surrounded atmosphere, therefore protecting the BSCF membrane from reduction. (c) 2007 Elsevier B.V. All rights reserved.
Keyword Engineering, Chemical
Polymer Science
ceramic membrane
oxygen permeation
mixed conductivity
Oxide Fuel-cells
Partial Oxidation
Separation Membranes
Ceramic Membranes
Q-Index Code C1
Q-Index Status Confirmed Code

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Created: Mon, 18 Feb 2008, 16:49:38 EST