Comparison of oxygen permeability and stability of perovskite type La0.2A0.8Co0.2Fe0.8O(3-δ) (A = Sr, Ba, Ca) membranes

Shiguang Li, Wanqin Jin, Pei Huang, Nanping Xu, Jun Shi, Y. S. Lin, Michael Z.C. Hu, E. Andrew Payzant

Research output: Contribution to journalArticle

79 Scopus citations

Abstract

The oxygen permeation and stability of La0.2A0.8Co0.2Fe0.8O(3-δ) (A = Sr, Ba, Ca) perovskite-type membranes were studied at high temperatures and low oxygen partial pressures. The oxygen vacancy diffusivity and concentration gradient calculated from the unsteady-state and steady-state oxygen data for the three membranes decrease in the order of Sr > Ba > Ca. The activation energies for oxygen permeation increase in the order of Sr < Ba < Ca. The oxygen permeation data of the three membranes can be explained by the average bond energy, free volume, and critical radius of the materials. After exposure to air at 1173 K for 10 h, part of La0.2Sr0.8Co0.2Fe0.8O(3-δ) transforms to La2O3, SrO, CoO, and Fe and the crystallite size of the perovskite phase decreases. These changes were not observed for La0.2Ba0.8Co0.2Fe0.8O(3-δ) under the same conditions, indicating that La0.2Ba0.8Co0.2Fe0.8O(3-δ) membrane is much more stable than La0.2Sr0.8Co0.2Fe0.8O(3-δ) at high temperatures and low oxygen partial pressures.

Original languageEnglish (US)
Pages (from-to)2963-2972
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Volume38
Issue number8
DOIs
StatePublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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