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

Amélie Thomas; Céline Dablemont; Jean Marie Basset; Frédéric Lefebvre

doi:10.1016/j.crci.2005.06.006

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 journal › Article › peer-review

52 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 language	English (US)
Pages (from-to)	1969-1974
Number of pages	6
Journal	Comptes Rendus Chimie
Volume	8
Issue number	11-12
DOIs	https://doi.org/10.1016/j.crci.2005.06.006
State	Published - Nov 2005
Externally published	Yes

Keywords

Acidity
Heteropolyacids
MAS NMR
Proton
Silica

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

Access to Document

10.1016/j.crci.2005.06.006

Cite this

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title = "Comparison of H3PW12O40 and H4SiW12O40 heteropolyacids supported on silica by 1H MAS NMR",

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.",

keywords = "Acidity, Heteropolyacids, MAS NMR, Proton, Silica",

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pages = "1969--1974",

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T1 - Comparison of H3PW12O40 and H4SiW12O40 heteropolyacids supported on silica by 1H MAS NMR

AU - Thomas, Amélie

AU - Dablemont, Céline

AU - Basset, Jean Marie

AU - Lefebvre, Frédéric

PY - 2005/11

Y1 - 2005/11

N2 - 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.

AB - 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.

KW - Acidity

KW - Heteropolyacids

KW - MAS NMR

KW - Proton

KW - Silica

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DO - 10.1016/j.crci.2005.06.006

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SN - 1631-0748

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EP - 1974

JO - Comptes Rendus Chimie

JF - Comptes Rendus Chimie

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