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

CIESC Journal ›› 2009, Vol. 17 ›› Issue (4): 562-570.

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

常先锋, 张春, 何艳君, 董学良, 金万勤, 徐南平

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China

收稿日期:2008-06-13 修回日期:2009-04-16 出版日期:2009-08-28 发布日期:2010-12-30
通讯作者: JIN Wanqin, E-mail: wqjin@njut.edu.cn
作者简介:
基金资助:
Supported by the National Basic Research Program of China(2009CB623406);the National Natural Science Foundation of China(20636020);the National High Technology Research and Development Program of China(2006AA030204);the Specialized Research Fund for the Doctoral Program of Higher Education of China(20060291003)

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

CHANG Xianfeng, ZHANG Chun, HE Yanjun, DONG Xueliang, JIN Wanqin, XU Nanping

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China

Received:2008-06-13 Revised:2009-04-16 Online:2009-08-28 Published:2010-12-30
Supported by:
Supported by the National Basic Research Program of China(2009CB623406);the National Natural Science Foundation of China(20636020);the National High Technology Research and Development Program of China(2006AA030204);the Specialized Research Fund for the Doctoral Program of Higher Education of China(20060291003)

摘要/Abstract

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 SrCo_0.4Fe_0.5Zr_0.1O_3-δ 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 1032h in partial oxidation of methane at 1123K,while the symmetric membrane was only of 528h.This study demonstrated that the asymmetric membrane was a promising geometrical configuration for the practical application.

关键词: comparison, mixed-conducting oxide, symmetric membrane, asymmetric membrane, oxygen permeability, chemical stability

Abstract: 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 SrCo_0.4Fe_0.5Zr_0.1O_3-δ 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 1032h in partial oxidation of methane at 1123K,while the symmetric membrane was only of 528h.This study demonstrated that the asymmetric membrane was a promising geometrical configuration for the practical application.

Key words: comparison, mixed-conducting oxide, symmetric membrane, asymmetric membrane, oxygen permeability, chemical stability

常先锋, 张春, 何艳君, 董学良, 金万勤, 徐南平. A Comparative Study of the Performance of Symmetric and Asymmetric Mixed-conducting Membranes[J]. CIESC Journal, 2009, 17(4): 562-570.

CHANG Xianfeng, ZHANG Chun, HE Yanjun, DONG Xueliang, JIN Wanqin, XU Nanping. A Comparative Study of the Performance of Symmetric and Asymmetric Mixed-conducting Membranes[J]. , 2009, 17(4): 562-570.

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

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

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