物理化学学报 >> 2000, Vol. 16 >> Issue (09): 798-803.doi: 10.3866/PKU.WHXB20000908

研究论文 上一篇    下一篇

丙烷氧化脱氢Ni-V-O催化剂的原位电导

照日格图, 葛庆杰, 李文钊, 于春英, 贾美林, 徐恒泳   

  1. 中国科学院大连化学物理研究所,大连 116023
  • 收稿日期:1999-12-06 修回日期:2000-03-20 发布日期:2000-09-15
  • 通讯作者: 李文钊 E-mail:wzli@ms.dicp.ac.cn

In Situ Electrical Conductivity Study of Ni-V-O Catalysts Used in Oxidative Dehydrogenation of Propane

Zhao Ri-GeTu, Ge Qing-Jie, Li Wen-Zhao, Yu Chun-Ying, Jia Mei-Lin, Xu Heng-Yong   

  1. Dlian Institute of Chemical Physics,Chinese Academy of Sciences 116023
  • Received:1999-12-06 Revised:2000-03-20 Published:2000-09-15
  • Contact: Li Wen-Zhao E-mail:wzli@ms.dicp.ac.cn

摘要:

应用原位电导方法测定了Ni-V-O系列催化剂在氧+丙烷→氧→丙烷连续变化气氛下的电导率, 确定其导电类型并与其丙烷氧化脱氢制丙烯催化性能相关联.结果表明,p型半导体较n型半导体具有优良的催化氧化脱氢性能;在反应气氛下催化剂的p型半导性越大,n型半导性越小,其催化活性越高. 这是由于p型半导体空穴导电,而n型半导体则为电子迁移导电,使得表面活性氧物种形成机理不同所致.

关键词: 丙烷, 氧化脱氢, 丙烯, 电导率, Ni-V-O催化剂

Abstract:

Electrical conductivity of Ni- V- O series catalysts was measured under different sequential gaseous atmospheres and at different temperatures, their conduction type was detemined and their catalytic behaviour in oxidative dehydrogenation of propane to propene was investigated. It was found that p- type semiconductor catalysts have a better catalytic behaviour than n- type ones. In reaction mixture, the higher the electrical conductivity of p- type semiconductor, the higher its catalytic activity, the lower electrical conductivity of n- type semiconductor, the higher its catalytic activity. These are due to different mechanism of the formation of the partial charged oxygen species on the surface of catalysts.

Key words: Propane, Oxidative dehydrogention, Propyene, Electrical conductivity, Ni-V-O catalyst