Composite membrane based on ionic conductor and mixed conductor for oxygen permeation

被引：102
作者：
Zhu, Xuefeng [1 ]
Yang, Weishen [1 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalys, Dalian 116023, Peoples R China
来源：
AICHE JOURNAL | 2008年 / 54卷 / 03期
关键词：
composite membrane; ceria; oxygen separation; ceramic membrane; syngas;
D O I：
10.1002/aic.11410
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
A composite membrane, which comprises of one fluorite oxide phase (Ce0.8Gd0.2O1.9) for oxygen ionic transport and one perovskite oxide phase (Gd0.2Sr0.8FeO3-delta) for both oxygen ionic and electronic transport, was investigated. XRD results revealed that the two oxides are compatible and showed good oxygen permeation stability at 950 C (more than 1100 h). Oxygen flux of the composite membrane was two times higher than that of the Gd0.2Sr0.8FeO3-delta mixed conducting membrane at the same conditions. At steady state, oxygen flux of a 0.5 mm membrane was 0.80 ml/(cm(2) min) under oxygen partial pressure gradient of air/He and similar to 5.0 ml/(cm(2) min) for syngas production at 950 degrees C, respectively. After similar to 440 h operation under syngas conditions, SEM analysis revealed that the syngas side of the membrane still kept dense and the EDX showed the transfer of elements occurred in the depth of a few microns. (c) 2008 American Institute of Chemical Engineers.
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页码：665 / 672
页数：8
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