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

• Published in: Chinese journal of chemical engineering Vol. 17; no. 4; pp. 562 - 570
• Main Author: 常先锋 张春 何艳君 董学良 金万勤 徐南平
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2009
• Subjects: asymmetric membrane; Asymmetry; Chemical engineering; chemical stability; comparison; Corrosion resistance; Mathematical analysis; Membranes; Methane; mixed-conducting oxide; oxygen permeability; Permeability; symmetric membrane; Thin films; 几何配置; 化学稳定性; 导电膜; 理论计算方法; 甲烷部分氧化; 非对称膜; oxygen permeability; chemical stability; comparison; symmetric membrane; asymmetric membrane; mixed-conducting oxide
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(08)60245-1

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-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.