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 |
Author: | 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. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/6817 |
DOI: | 10.1016/j.catcom.2010.11.005 |
ISSN: | 1566-7367 |
Appears in Collections: | DQ - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Catalysis Communications 12 (2011) 459–463.pdf | Main article | 617.45 kB | Adobe PDF |
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