A New Series of Sr(Co,Fe,Zr)O3- Perovskite-Type Membrane Materials for Oxygen Permeation
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- 作者：Li Yang ; Liang Tan ; Xuehong Gu ; Wanqin Jin ; Lixiong Zhang ; and Nanping Xu
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2003
- 出版时间：May 28, 2003
- 年：2003
- 卷：42
- 期：11
- 页码：2299 - 2305
- 全文大小：359K
- 年卷期：v.42,no.11(May 28, 2003)
- ISSN：1520-5045
文摘
A new series of SrCo0.4Fe0.6-xZrxO3-
(0 
x 0.2) and SrCo0.95-xFexZr0.05O3- (0.1 x 0.8)oxides were synthesized by the solid-state reaction method. The incorporation of Zr and its effecton the crystal chemistry, oxygen permeation, and structural stability of SrCo0.4Fe0.6-xZrxO3-have been investigated. Formation of the solid solutions with the cubic perovskite-type structurewas found in the SrCo0.4Fe0.6-xZrxO3- oxide system in the range of 0 x < 0.1. The incorporationof the proper content of Zr into SrCo0.4Fe0.6O3- suppressed the oxygen loss at high temperatureand could stabilize the cubic structure of perovskite in a low oxygen partial pressure atmosphere,while the oxygen permeability of SrCo0.4Fe0.6-xZrxO3- membranes decreased with increasingZr content. A total of 5 mol % of Zr cation dissolution was considered to be enough for thestructural stability without deleteriously affecting the oxygen flux. Meanwhile, an investigationof the effect of the Co content on the oxygen permeation and structural stability ofSrCo0.95-xFexZr0.05O3- series oxides showed that, with increasing Co content, the oxygenpermeability increased, but no phase transition occurred in low oxygen partial pressure for allof the samples investigated. Our results indicated that the content of Zr played a critical role inthe stability of Sr-Co-Fe-Zr-O series oxides. When good structural stability and oxygenpermeation properties are combined, these Sr(Co,Fe,Zr)O3- oxides are considered to be promisingcandidates as oxygen separation membranes.
(0 x 0.2) and SrCo0.95-xFexZr0.05O3- (0.1 x 0.8)oxides were synthesized by the solid-state reaction method. The incorporation of Zr and its effecton the crystal chemistry, oxygen permeation, and structural stability of SrCo0.4Fe0.6-xZrxO3-have been investigated. Formation of the solid solutions with the cubic perovskite-type structurewas found in the SrCo0.4Fe0.6-xZrxO3- oxide system in the range of 0 x < 0.1. The incorporationof the proper content of Zr into SrCo0.4Fe0.6O3- suppressed the oxygen loss at high temperatureand could stabilize the cubic structure of perovskite in a low oxygen partial pressure atmosphere,while the oxygen permeability of SrCo0.4Fe0.6-xZrxO3- membranes decreased with increasingZr content. A total of 5 mol % of Zr cation dissolution was considered to be enough for thestructural stability without deleteriously affecting the oxygen flux. Meanwhile, an investigationof the effect of the Co content on the oxygen permeation and structural stability ofSrCo0.95-xFexZr0.05O3- series oxides showed that, with increasing Co content, the oxygenpermeability increased, but no phase transition occurred in low oxygen partial pressure for allof the samples investigated. Our results indicated that the content of Zr played a critical role inthe stability of Sr-Co-Fe-Zr-O series oxides. When good structural stability and oxygenpermeation properties are combined, these Sr(Co,Fe,Zr)O3- oxides are considered to be promisingcandidates as oxygen separation membranes.