Comparison of H3PW12O40 and H4SiW12O40 heteropolyacids supported on silica by 1H MAS NMR

Amélie Thomas, Céline Dablemont, Jean Marie Basset, Frédéric Lefebvre*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

The H3PW12O40 and H4 SiW12O40 heteropolyacids supported on silica were studied by 1H MAS NMR as a function of both the coverage and the dehydroxylation temperature. The signal at ca. 8 ppm attributed to the highly acidic protons of the anhydrous form of the heteropolyacid was never observed in the case of the phosphotungstic polyanion supported on silica while it was clearly present in the case of the silicotungstic species. These results explain the different activities of the two supported heteropolyacids in acid reactions involving strong acid sites.

Original languageEnglish (US)
Pages (from-to)1969-1974
Number of pages6
JournalComptes Rendus Chimie
Volume8
Issue number11-12
DOIs
StatePublished - Nov 2005
Externally publishedYes

Keywords

  • Acidity
  • Heteropolyacids
  • MAS NMR
  • Proton
  • Silica

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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