Characterization of silica-supported dodecatungstic heteropolyacids as a function of their dehydroxylation temperature

N. Legagneux, J.M. Basset, A. Thomas, F. Lefebvre, Alexandre Goguet, J. Sa, Christopher Hardacre

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

Dodecatungsto-silicic H4SiW12O40 and -phosphoric acids H3PW12O40 were deposited on silica by a classical impregnation technique. The resulting materials were studied by in situ Raman and infrared spectroscopy, XPS and by solid-state H-1 MAS NMR as a function of their dehydroxylation temperature. The data show that in the case of H3PW12O40 three silanol groups are protonated while in the case of H4SiW12O40 at least one acidic proton remains. Upon heating this proton reacts leading to a disordered structure and a broadening of the W-O Raman bands.
Original languageEnglish
Pages (from-to)2235-2240
Number of pages6
JournalDalton Transactions
Issue number12
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Inorganic Chemistry

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