Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2007, Vol. 28 ›› Issue (2): 103-105.

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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

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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