Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (4): 16-19.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Oxygen Nonstoichiometry and Oxygen Permeation Model of Perovskite-Type La0. 1 Sr0.9 CO0.9 F e0. 1 O3-δ Membrane

Yuan Wen  Luo Yi-ke  Li Li   

  1. school of Chemical and Energy Engineering , 50uth China Univ. of Tech. , Guangzhou 510640 , Guandong , China
  • Received:2006-01-09 Online:2007-04-25 Published:2007-04-25
  • Contact: 袁文辉(1969-)，男，博士，副教授，主要从事膜分离催化研究。 E-mail:cewhyuan@scuLedu.cn
  • About author:袁文辉(1969-)，男，博士，副教授，主要从事膜分离催化研究。
  • Supported by:

    教育部留学基金、教育部传热与节能重点实验室基金资助项目;广东省自然科学基金资助项目(04020126)

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Abstract:

The equilihrium relationship of the oxygen nonstoichiometry of perovskite-type ceramic memhrane is known to he related to the partial oxygen pressure and the temperature , and has proved to he critical to the applica-tions of the ceramic. In this paper , a perovskite-type La0. 1 Sr0.9 CO0.9 F e0. 1 O3-δ  oxide ceramic was synthesized by means of EDT A -citrate complex method , and the crystal structure and morphology of the produced ceramic powder were characterized hy TG/D5C , XRD and 5EM. The oxygen nostoichiometryδin the range of 0.33~ 0.51 was then ohtained hy TGA at 923 ~1223 K with the pressure varying from 0.101 Pa to 1.01 X 105 Pa. Moreover , a sim-plified semi -empirical equation was used to calculate the oxygen nostoichiometry , It was found that the equation ac-cords very well with the measured oxygen nonstoichiometry. Based on the semi-empirical equation , a model to pre-dict the oxygen permeation flux was finally ohtained , whose effectiveness was verified hy experiments.

Key words: oxygen, nonstoichiometry, perovskite-type ceramic memhrane, oxygen permeation, model