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 Iron(III)-substituted polyoxotungstates immobilized on silica nanoparticles: novel oxidative heterogeneous catalysts
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6817

title: Iron(III)-substituted polyoxotungstates immobilized on silica nanoparticles: novel oxidative heterogeneous catalysts
authors: Sousa, JLC
Santos, ICMS
Simoes, MMQ
Cavaleiro, JAS
Nogueira, HIS
Cavaleiro, AMV
keywords: Polyoxometalates
Silica nanoparticles
Heterogeneous catalysis
Epoxidation
Hydrogen peroxide
Geraniol
issue date: 10-Feb-2011
publisher: Elsevier
abstract: Silica nanoparticles supporting polyoxometalates (POMs), namely an iron(III) mono-substituted Keggin-type polyoxotungstate of formula alpha-[PW(11)Fe(III)(H(2)O)O(39)](4-) and a sandwich-type tungstophosphate with the formula B-alpha-[(PW(9)O(34))(2)Fe(4)(III)(H(2)O)(2)](6-) were synthesized. The POM/SiO(2) nanocomposites were obtained by alkaline hydrolysis of tetraethoxysilane using a reverse micelle and sol-gel technique. The spectroscopic studies suggest that the POMs were successfully immobilized on the silica nanoparticles. The catalytic activity of POM/SiO(2) nanomaterials was tested in the epoxidation of geraniol using H(2)O(2) as oxygen donor. The alpha-[PW(11)Fe(III)(H(2)O)O(39)](4-)/SiO(2) nanocomposite was the most efficient catalyst with high geraniol conversion and good regioselectivity for 2,3-epoxygeraniol. (C) 2010 Elsevier B.V. All rights reserved.
description: Supplementary materials related to this article can be found online at doi:10.1016/j.catcom.2010.11.005.
URI: http://hdl.handle.net/10773/6817
ISSN: 1566-7367
publisher version/DOI: http://dx.doi.org/10.1016/j.catcom.2010.11.005
source: Catalysis Communications
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