Layered perovskite Y1-xCaxBaCo4O7+delta as ceramic membranes for oxygen separation

Zhang, Kun, Zhu, Zhonghua, Ran, Ran, Shao, Zongping, Jin, Wanqin and Liu, Shaomin (2010) Layered perovskite Y1-xCaxBaCo4O7+delta as ceramic membranes for oxygen separation. Journal of Alloys and Compounds, 492 1-2: 552-558. doi:10.1016/j.jallcom.2009.11.173

Author Zhang, Kun
Zhu, Zhonghua
Ran, Ran
Shao, Zongping
Jin, Wanqin
Liu, Shaomin
Title Layered perovskite Y1-xCaxBaCo4O7+delta as ceramic membranes for oxygen separation
Formatted title
Layered perovskite Y1−xCaxBaCo4O7+δ as ceramic membranes for oxygen separation
Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
Publication date 2010-03-04
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2009.11.173
Volume 492
Issue 1-2
Start page 552
End page 558
Total pages 7
Place of publication Lausanne
Publisher Elsevier Sequoia
Collection year 2011
Language eng
Formatted abstract
Layer-structured mixed conducting oxides with the composition Y1-xCaxBaCo4O7+delta (x = 0.0-0.4) were synthesized and their performance as oxygen separating membranes was explored. The crystal structure, phase stability, oxygen absorption/desorption properties, and electrical conductivity of the oxides, as well as oxygen permeation fluxes of the corresponding membranes, were systematically investigated. The properties of YBaCo4O7+delta-based oxides were greatly improved by Ca incorporation into the lattice structure at an optimal concentration. In the series Y1-xCaxBaCo4O7+delta, the Y0.8Ca0.2BaCo4O7+delta membrane exhibited the highest oxygen permeation flux, reaching a value of 0.75 x 10(-6) mol cm(-2) s(-1) at 900 degrees C under the conditions of air/helium oxygen gradient and a membrane thickness of 1.0 mm. Studies of the effect of membrane thickness on the oxygen fluxes implied that at membrane thicknesses larger than 0.7 mm, the permeation process was mainly controlled by bulk diffusion, indicating the potential to further improve the oxygen fluxes via thinner membranes of asymmetric structure. (C) 2009 Elsevier B.V. All rights reserved.
Keyword Oxygen permeation
Mixed conductor
Ceramic membrane
Hollow-fiber Membranes
Surface exchange
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 11 Apr 2010, 00:04:45 EST