A dense oxygen separation membrane with a layered morphologic structure

Chen, ZH, Shao, ZP, Ran, R, Zhou, W, Zeng, PY and Liu, SM (2007) A dense oxygen separation membrane with a layered morphologic structure. Journal of Membrane Science, 300 1-2: 182-190. doi:10.1016/j.memsci.2007.05.023

Author Chen, ZH
Shao, ZP
Ran, R
Zhou, W
Zeng, PY
Liu, SM
Title A dense oxygen separation membrane with a layered morphologic structure
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
Publication date 2007-08-15
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.memsci.2007.05.023
Volume 300
Issue 1-2
Start page 182
End page 190
Total pages 8
Place of publication Netherlands
Publisher Elsevier BV
Collection year 2008
Language eng
Subject 290603 Membrane and Separation Technologies
660199 Energy transformation not elsewhere classified
Abstract A configuration of dense mixed ionic and electronic conducting (MIEC) membrane with layered morphological structure for oxygen separation, which combines the benefits of high oxygen permeation flux of cobalt-based membrane, high chemical stability of iron-based perovskite and high mechanical strength of thick membrane, was studied. The membrane is normally composed of two layers; each layer is a dense MIEC oxide. The substrate layer is a thick dense membrane with high oxygen permeability but relatively lower chemical stability. The feasibility of dense thick Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF5582) membrane as the substrate layer and Ba0.5Sr0.5Co0.2Fe0.8O3-delta (BSCF5528) as the thin-film layer was mainly experimentally investigated. Both the BSCF5582 and the BSCF5528 show the same cubic perovskite structure and the similar lattice constant with no detrimental reaction products formed. By optimizing fabrication parameters of a simple dry pressing process, dual-layered membrane, free of cracks, was successfully fabricated. The oxygen permeation flux of a dual-layered membrane with the thin-film BSCF5528 layer facing to the sweep gas reached 2.1 mL cm(-2) min(-1) [STP] (1.56 x 10(-6) mol cm(-2) s(-1)) at 900 degrees C, which is about 3.5 times higher than that of the BSCF5528 membrane (0.6 mL cm(-2) min(-1), [STP] (4.46 x 10(-7) mol cm(-2) s(-1)) under the same conditions. (C) 2007 Elsevier B.V. All rights reserved.
Keyword Perovskite
Oxygen permeation
Asymmetric membrane
Mixed conductor
Layered structure
Q-Index Code C1
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Created: Mon, 21 Apr 2008, 14:48:04 EST by Gail Smith on behalf of School of Chemical Engineering