催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (2): 103-105.

• 研究论文 • 上一篇    下一篇

12-磷钨酸及其铯盐的酸位可接近性: 固体核磁共振探针分子研究

康海霞1,杨俊2   

  1. 1 中国地质大学(北京)能源学院, 北京 100083; 2 中国科学院武汉物理与数学研究所
  • 收稿日期:2007-02-25 出版日期:2007-02-25 发布日期:2011-01-28

Accessibility of Acidic Protons in 12-Phosphotungstic Acid and Its Cesium Hydrogen Salt as Revealed by Solid State NMR Spectroscopy

KANG Haixia1*, YANG Jun2*   

  1. 1 College of Energy, China University of Geoscience (Beijing), Beijing 100083, China; 2 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071, Hubei, China
  • Received:2007-02-25 Online:2007-02-25 Published:2011-01-28

PDF

917

被引次数

11

摘要： 固体酸催化剂的酸位可接近性是影响催化剂性能的重要性质. 使用与反应分子大小接近的碱性探针分子三甲基膦和固体核磁共振技术,定量研究了磷钨酸及其铯盐的酸位可接近性. 结果表明,磷钨酸具有“假液相性”,三甲基膦可以接近磷钨酸体相中的酸位,在无水的磷钨酸中,有大约2/5的酸位可以被三甲基膦所接近. 磷钨酸的铯盐没有“假液相性”,探针分子只能接近催化剂表面的酸位,在无水的Cs1.5H1.5PW12O40中,只有大约5%的酸位能够被三甲基膦所接近.

关键词: 12-磷钨酸, 酸位的可接近性, 固体核磁共振, 探针分子, 三甲基膦, 假液相性

Abstract: The accessibility of acidic protons in 12-phosphotungstic acid and its cesium hydrogen salt has been studied by the probe molecule trimethylphosphine and solid state NMR. The experimental results indicate that 2/5 acidic protons in the anhydrous 12-phosphotungstic acid can be accessed by the probe molecules. However, only acidic protons on the surface of the cesium salt of 12-phosphotungstic acid can be accessed by the probe molecules trimethylphosphine.

Key words: 12-phosphotungstic acid, accessibility of acidic protons, solid state NMR, probe molecule, trimethylphosphine, pseudoliquid phase