OXYGEN PERMEATION STUDIES OF SRCO0.8FE0.2O3-DELTA

被引：308

作者：

QIU, L

LEE, TH

LIU, LM

YANG, YL

JACOBSON, AJ

机构：

[1] UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204

[2] UNIV HOUSTON,TEXAS CTR SUPERCOND,HOUSTON,TX 77204

来源：

SOLID STATE IONICS | 1995年 / 76卷 / 3-4期

关键词：

BROWNMILLERITE; CATALYTIC REACTOR; ORDER-DISORDER TRANSITION; OXYGEN PERMEABILITY; OXYGEN SEPARATION; PEROVSKITE;

D O I：

10.1016/0167-2738(94)00296-5

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 fluxes through dense SrCo0.80Fe0.20O3-delta membranes have been measured in the temperature range 620-920 degrees C under various oxygen partial pressure gradients. The permeation results are compared with the previous measurements. Below 770 degrees C, the apparent activation energy for the overall permeation is 22 +/- 4 kcal/mol. Above 770 degrees C, a change in the activation energy is observed associated with an order-disorder transition of the oxygen atom vacancies. The permeation mechanism is discussed in relation to the phase diagram of SrCo0.80Fe0.20O3-delta. Based on permeation measurements using discs with different thicknesses, we propose that the surface exchange process is the rate-limiting step in the overall permeation mechanism.

引用

页码：321 / 329

页数：9

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