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Issue 12, 2009
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Characterization of silica-supported dodecatungstic heteropolyacids as a function of their dehydroxylation temperature

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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 1H 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.

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

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Article information


Submitted
25 Sep 2008
Accepted
24 Dec 2008
First published
04 Feb 2009

Dalton Trans., 2009, 2235-2240
Article type
Paper

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

N. Legagneux, J. Basset, A. Thomas, F. Lefebvre, A. Goguet, J. Sá and C. Hardacre, Dalton Trans., 2009, 2235
DOI: 10.1039/B816806G

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