A Comparative Study of the Performance of Symmetric and Asymmetric Mixed-conducting Membranes

被引：21
作者：
Chang Xianfeng [1 ]
Zhang Chun [1 ]
He Yanjun [1 ]
Dong Xueliang [1 ]
Jin Wanqin [1 ]
Xu Nanping [1 ]
机构：
[1] Nanjing Univ Technol, State Key Lab Mat Oriented Chem Engn, Coll Chem & Chem Engn, Nanjing 210009, Peoples R China
来源：
CHINESE JOURNAL OF CHEMICAL ENGINEERING | 2009年 / 17卷 / 04期
基金：
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词：
comparison; mixed-conducting oxide; symmetric membrane; asymmetric membrane; oxygen permeability; chemical stability; DENSE CERAMIC MEMBRANES; PEROVSKITE-TYPE MEMBRANE; PARTIAL OXIDATION; OXYGEN PERMEATION; SYNTHESIS GAS; METHANE; REACTORS; SYNGAS; SEPARATION; PERMEABILITY;
D O I：
10.1016/S1004-9541(08)60245-1
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
According to the configuration, mixed-conducting membranes are classified as symmetric membranes and asymmetric membranes consisting of a thin dense layer and a porous support. In this study, these two kinds of SrCo0.4Fe0.5Zr0.1O3-delta oxide-based membranes were systematically compared in terms of oxygen permeability and chemical stability, and their differences were elucidated by means of the theoretical calculation. For the oxygen permeability, the asymmetric membrane was greater than the symmetric membrane due to the significant decrease of bulk diffusion resistance in the thin dense layer of the asymmetric membrane. In regard to the chemical stability, the increase of oxygen partial pressure on the asymmetric membrane surface at CH4 side produced the stable time of over 1032 h in partial oxidation of methane at 1123 K, while the symmetric membrane was only of 528 h. This study demonstrated that the asymmetric membrane was a promising geometrical configuration for the practical application.
引用
收藏
页码：562 / 570
页数：9
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