Thickness dependence of oxygen permeation through erbia-stabilized bismuth oxide silver composites

被引:37
作者
Chen, CS [1 ]
Kruidhof, H [1 ]
Bouwmeester, HJM [1 ]
Verweij, H [1 ]
Burggraaf, AJ [1 ]
机构
[1] UNIV SCI & TECHNOL CHINA,DEPT MAT SCI & ENGN,HEFEI 230026,ANHUI,PEOPLES R CHINA
关键词
oxygen permeation; oxygen separation membranes; stabilized bismuth oxide; silver;
D O I
10.1016/S0167-2738(97)00271-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Oxygen permeation measurements were performed on erbia-stabilized bismuth oxide-silver (40 v/o) composite membranes in the range of thickness of 1.60-0.23 mm and temperature of 850-650 degrees C. Air was fed at one side of the membranes while permeated oxygen on the other side was swept away with helium. An oxygen flux as high as 1.56 x 10(-7) mol/cm(2)/s was observed for a 0.23 mm thick membrane at 750 degrees C and p(O2)(1)=0.056 atm. The examination of the dependence of permeance on the membrane thickness reveals that (a) the oxygen transport kinetics are controlled by the diffusion of oxygen ions in the bulk of membrane with thickness down to about 1.0 mm; (b) with further decrease in thickness, the oxygen permeation becomes partially limited by surface oxygen exchange. The surface exchange rate has been found to decrease less pronouncedly than the bulk process as temperature decreases. The mass transfer is suggested to be the rate-limiting step for the surface process.
引用
收藏
页码:215 / 219
页数:5
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