Separations

The role of A-site ion nonstoichiometry in the oxygen absorption properties of Sr1+xCo0.8Fe0.2O3 oxides

  1. Yufeng He1,2,
  2. Xuefeng Zhu1,
  3. Weishen Yang1,*

Article first published online: 18 MAR 2010

DOI: 10.1002/aic.12246

Issue

AIChE Journal

AIChE Journal

Volume 57, Issue 1, pages 87–95, January 2011

Additional Information

How to Cite

He, Y., Zhu, X. and Yang, W. (2011), The role of A-site ion nonstoichiometry in the oxygen absorption properties of Sr1+xCo0.8Fe0.2O3 oxides. AIChE J., 57: 87–95. doi: 10.1002/aic.12246

Author Information

  1. 1

    State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

  2. 2

    Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

*State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Publication History

  1. Issue published online: 18 MAR 2010
  2. Article first published online: 18 MAR 2010
  3. Accepted manuscript online: 18 MAR 2010 12:00AM EST
  4. Manuscript Revised: 10 FEB 2010
  5. Manuscript Received: 22 NOV 2009

Funded by

  • National Science Fund for Distinguished Young Scholars. Grant Number: 20725313
  • Ministry of Science and Technology of China. Grant Number: 2005CB221404

SEARCH

SEARCH BY CITATION

ARTICLE TOOLS

View Full Article (HTML) Get PDF (528K)

Keywords:

  • absorbents;
  • oxygen separation;
  • absorption capacity;
  • desorption rate;
  • stability

Abstract

Sr1+xCo0.8Fe0.2O3 (−0.2 ≤ x ≤ 0.1) oxides have been synthesized and investigated as potential oxygen absorbents for high temperature oxygen separation processes. It was found that the A-site ion deficient Sr0.95Co0.8Fe0.2O3 and Sr0.9Co0.8Fe0.2O3 oxides have larger oxygen absorption capacities, and slightly higher oxygen desorption rates. However, the A-site ion excess Sr1.05Co0.8Fe0.2O3 and Sr1.1Co0.8Fe0.2O3 exhibited much higher oxygen desorption rates, but smaller oxygen absorption capacities. The oxygen absorption capacities were further verified using oxygen temperature-programmed desorption technique, and the oxygen desorption rates were well described by a pseudo-second-order kinetics model. In addition, the long-term stability of Sr0.9Co0.8Fe0.2O3 was investigated for 280 h (1120 loops) with switching between oxygen absorption and desorption. The excellent stability was confirmed by X-ray diffraction patterns which suggested that the cyclic processes of oxygen absorption and desorption took place between the perovskite structure with disordered oxygen vacancies and the brownmillerite structure with ordered oxygen vacancies. © 2010 American Institute of Chemical Engineers AIChE J, 2011

View Full Article (HTML) Get PDF (528K)