Stabilities of La0.6Sr0.4Co0.2Fe0.8O3-δ oxygen separation membranes-Effects of kinetic demixing/decomposition and impurity segregation

被引：39

作者：

Wang, Bo ^{[1
]}

Zydorczak, B. ^{[1
]}

Wu, Zhen-Tao ^{[1
]}

Li, K. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem Engn, London SW7 2AZ, England

来源：

JOURNAL OF MEMBRANE SCIENCE | 2009年 / 344卷 / 1-2期

基金：

英国工程与自然科学研究理事会;

关键词：

La0.6Sr0.4Co0.2Fe0.8O3-delta; Oxygen separation; Kinetic demixing; Impurity segregation; HOLLOW-FIBER MEMBRANES; PEROVSKITE MEMBRANES; PERMEATION; DECOMPOSITION;

D O I：

10.1016/j.memsci.2009.07.040

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Effects of kinetic demixing/decomposition and impurity segregation on stabilities of the La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) membranes in hollow fibre geometry were studied under oxygen separation conditions. The membranes were operated under 0.21/0.008 oxygen partial pressure (bar) difference at 950 degrees C for 1128 h. Cobalt oxide grains were found to be separated on the air side of the membrane surface after the long-term operation, and strontium and iron were also enriched with the 50 nm depth from the surface layer of air side. Glassy sodium-rich second phase was identified and was found to be segregated at the grain boundary in the LSCF bulk, and had grown during high temperature operations. The oxygen permeation performance is, however, stable after being operated for 1128 h, indicating that the kinetic demixing/decomposition and impurity segregation cause the negligible effects on the permeability of the LSCF membranes at the operating conditions applied. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：101 / 106

页数：6

共 24 条

[21] Performance of functional perovskite membranes for oxygen production [J].

Vente, JF ;

Haije, WG ;

Rak, ZS .

JOURNAL OF MEMBRANE SCIENCE, 2006, 276 (1-2) :178-184

[22] Mass transport in La1-xSrxFeO3(x=0 and 0. 1) measured by SIMS [J].

Wærnhus, I ;

Sakai, N ;

Yokokawa, H ;

Grande, T ;

Einarsrud, MA ;

Wiik, K .

SOLID STATE IONICS, 2004, 175 (1-4) :69-71

[23] Cation diffusion in La1-xSrxFeO3-δ, x=0 and 0.1 measured by SIMS [J].

Wærnhus, Ivar ;

Sakai, Natsuko ;

Yokokawa, Harumi ;

Grande, Tor ;

Einarsrud, Mari-Ann ;

Wiik, Kjell .

SOLID STATE IONICS, 2007, 178 (13-14) :907-914

[24] Stability of La0.6Sr0.4Co0.2Fe0.8O3-δ perovskite membranes in reducing and nonreducing environments [J].

Xu, SJ ;

Thomson, WJ .

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1998, 37 (04) :1290-1299

← 1 2 3 →