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
nationality International
journal CATALYSIS COMMUNICATIONS
author keywords Polyoxometalates; Silica nanoparticles; Heterogeneous catalysis; Epoxidation; Hydrogen peroxide; Geraniol
keywords IRON-SUBSTITUTED POLYOXOTUNGSTATES; HYDROGEN-PEROXIDE; CATIONIC SILICA; POLYOXOMETALATE CLUSTERS; AEROBIC OXIDATIONS; ALLYLIC ALCOHOLS; AMORPHOUS SILICA; EPOXIDATION; CHEMISTRY; H2O2
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.
publisher ELSEVIER SCIENCE BV
issn 1566-7367
year published 2011
volume 12
issue 6
beginning page 459
ending page 463
digital object identifier (doi) 10.1016/j.catcom.2010.11.005
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000287289000016
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journal impact factor (jcr 2016): 3.330
5 year journal impact factor (jcr 2016): 3.507
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