物理化学学报 >> 1987, Vol. 3 >> Issue (03): 237-241.doi: 10.3866/PKU.WHXB19870304

研究论文 上一篇    下一篇

用XPS研究在加热时锑铁氧化物催化剂的表面偏析作用

胡刚   

  1. 中国科学院长春应用化学研究所
  • 收稿日期:1985-09-16 修回日期:1986-09-25 发布日期:1987-06-15
  • 通讯作者: 胡刚

X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF SURFACE SEGREGATION OF Sb-Fe MIXED OXIDE CATALYSTS DURING HEAT

Hu Gang   

  1. Changchun Institute of Applied Chemistry; Academia Sinica
  • Received:1985-09-16 Revised:1986-09-25 Published:1987-06-15
  • Contact: Hu Gang

摘要: 本文通过XPS对锑铁氧化物催化剂组成与热处理关系的研究, 推测出氧化物催化剂表面上形成FeSb_2O_6的最低浓度, 并提出了锑表面偏析生成FeSb_2O_6的“临界浓度”这一新概念。

Abstract: The surface composition of antimony-iron mixed oxide catalysts has been foundto be dependent upon heat treatment, the surface becoming progressively enriched in antimony at elevated temperature. Surface segregation of antimony has been in-vestigated by X-ray photoelectron spectroscopy (XPS) and values of segregation heat have been obtained. When the ratio of Sb to Fe in the bulk is 0.44, theirratio on surface is approximately 2. It is supposed that surface formation in Sb-Fe mixed oxide catalysts is FeSb_2O_6. The value 0.44 is the critical concentration of Sb segregation to form FeSb_2O_6. Below this critical value and so segregation of the FeSb_2O_6 phase is not observed.