1H and 31P solid-state NMR of trimethylphosphine adsorbed on heteropolytungstate supported on silica

J. Deleplanque,Robert Hubaut,Philippe R Bodart,M. Fournier,Alain Rives

Applied Surface Science（2009）

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摘要

Trimethylphosphine (TMP) has been used as an NMR probe in order to determine the acidity of Keggin-type 12-tungstophosphoric heteropolyacid (HPW), pure and supported on silica, dehydrated at 473K. Adsorption of TMP on pure dehydrated HPW leads to the formation of trimethylphosphonium ions (TMPH+) characteristic of the presence of strong Brönsted acid sites. TMP replaces the water molecules lost by dryness and allows the Keggin secondary structure to recover.

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82.56−Dj,68.43.−h,82.65.+r

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