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

Nicolas Legagneux; Jean Marie Basset; Amélie Thomas; Frédéric Lefebvre; Alexandre Goguet; Jacinto Sá; Christopher Hardacre

doi:10.1039/b816806g

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

Nicolas Legagneux
, Jean Marie Basset
, Amélie Thomas
, Frédéric Lefebvre^*
, Alexandre Goguet
, Jacinto Sá
, Christopher Hardacre

^*Corresponding author for this work

ESCPE Lyon
Queen's University Belfast

Research output: Contribution to journal › Article › peer-review

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 H₄SiW ₁₂O₄₀ 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 language	English
Pages (from-to)	2235-2240
Number of pages	6
Journal	Dalton Transactions
Issue number	12
DOIs	https://doi.org/10.1039/b816806g
Publication status	Published - 2009

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title = "Characterization of silica-supported dodecatungstic heteropolyacids as a function of their dehydroxylation temperature",

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 H4SiW 12O40 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.",

author = "Nicolas Legagneux and Basset, \{Jean Marie\} and Am{\'e}lie Thomas and Fr{\'e}d{\'e}ric Lefebvre and Alexandre Goguet and Jacinto S{\'a} and Christopher Hardacre",

year = "2009",

doi = "10.1039/b816806g",

language = "English",

pages = "2235--2240",

journal = "Dalton Transactions",

issn = "1477-9226",

publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - Characterization of silica-supported dodecatungstic heteropolyacids as a function of their dehydroxylation temperature

AU - Legagneux, Nicolas

AU - Basset, Jean Marie

AU - Thomas, Amélie

AU - Lefebvre, Frédéric

AU - Goguet, Alexandre

AU - Sá, Jacinto

AU - Hardacre, Christopher

PY - 2009

Y1 - 2009

N2 - 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 H4SiW 12O40 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.

AB - 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 H4SiW 12O40 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.

UR - https://www.scopus.com/pages/publications/67649388155

U2 - 10.1039/b816806g

DO - 10.1039/b816806g

M3 - Article

AN - SCOPUS:67649388155

SN - 1477-9226

SP - 2235

EP - 2240

JO - Dalton Transactions

JF - Dalton Transactions

IS - 12

ER -

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

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