物理化学学报 >> 1995, Vol. 11 >> Issue (04): 302-307.doi: 10.3866/PKU.WHXB19950404

研究论文 上一篇    下一篇

钒硅沸石中钒的存在状态研究

张春雷,吴志芸   

  1. 吉林大学化学系|长春 130023
  • 收稿日期:1994-01-15 修回日期:1994-05-21 发布日期:1995-04-15
  • 通讯作者: 吴志芸

Study on State of Vanadium in V-ZSM-5 Zeolites

Zhang Chun-Lei,Wu Zhi-Yun   

  1. Department of Chemistry,Jilin University,Changchun 130023, China
  • Received:1994-01-15 Revised:1994-05-21 Published:1995-04-15
  • Contact: Wu Zhi-Yun

摘要:

合成了四种不同Si/V比的V-ZSM-5分子筛,并根据XPS、ESR、TPR及DRS测试,分析了钒在沸石中的存在状态,结果表明,沸石中的钒有两种价态,每一种价态的钒又有两种存在形式,即骨架外高分散的钒(包括沸石外表面上和孔道内的钒)及存在于骨架上的钒。

关键词: V-ZSM-5, 存在状态, 价态, 骨架, ESR, DRS

Abstract:

V-ZSM-5 zeolites with various Si/V ratios have been synthesized, and the state of vanadium in zeolites was studied by XPS, ESR, TPR and DRS techniques. The results indicate that each of them has two forms-the nonframework vanadium highly dispersed in the zeolite (consisting of vanadiums on outer surface and in pore) and the framework vanadium in zeolite.

Key words: V-ZSM-5, State, Valence, Framework, ESR, UV-DRS