华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (4): 16-19.

• 化学化工 • 上一篇    下一篇

钙饮矿型La0. 1 Sr0.9 CO0.9 F e0. 1 O3-δ 膜的非化学计量及氧渗透模型

袁文辉 罗仡科 李莉   

  1. 华南理工大学 化工与能源学院,广东 广州 510640
  • 收稿日期:2006-01-09 出版日期:2007-04-25 发布日期:2007-04-25
  • 通信作者: 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
  • 作者简介:袁文辉(1969-),男,博士,副教授,主要从事膜分离催化研究。
  • 基金资助:

    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)

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)

摘要: 钙铁矿型透氧膜的非化学计量平衡关系与氧分压和温度有关,并对其应用起决定作用.文中以全属硝酸盐为前驱休,采用EDTA-拧稼酸联合络合法制备了钙铁矿型氧化物La0. 1 Sr0.9 CO0.9 F e0. 1 O3-δ ,并利用TG/DSC 、XRD 、SEM 等方法对La0. 1 Sr0.9 CO0.9 F e0. 1 O3-δ 粉体的晶体结构和表面形态进行了表征.温度在923~1223K 、压力在0.101 ~1. 01 X 105 Pa之间变化时,采用热重分析法测得La0. 1 Sr0.9 CO0.9 F e0. 1 O3-δ 的非化学计量值在0.33 ~0.51 之间.文中还利用简化的半经验公式对非化学计量值δ 进行了计算,发现半经验公式能很好地与实验数据相拟合,由此得到了一个氧渗透通量的计算模型.实验结果表明,所提出的模型能够较好地预测La0. 1 Sr0.9 CO0.9 F e0. 1 O3-δ 膜的氧渗透通量.

关键词: 氧, 非化学计量, 钙铁矿型陶瓷膜, 氧渗透, 模型

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