|
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. |
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publisher |
ELSEVIER SCIENCE BV |
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issn |
1566-7367 |
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year published |
2011 |
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volume |
12 |
|
issue |
6 |
|
beginning page |
459 |
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ending page |
463 |
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digital object identifier (doi) |
10.1016/j.catcom.2010.11.005 |
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web of science category |
Chemistry, Physical |
|
subject category |
Chemistry |
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unique article identifier |
WOS:000287289000016
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