Iron(III)-substituted polyoxotungstates immobilized on silica nanoparticles: Novel oxidative heterogeneous catalysts

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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.

keywords

IRON-SUBSTITUTED POLYOXOTUNGSTATES; HYDROGEN-PEROXIDE; CATIONIC SILICA; POLYOXOMETALATE CLUSTERS; AEROBIC OXIDATIONS; ALLYLIC ALCOHOLS; AMORPHOUS SILICA; EPOXIDATION; CHEMISTRY; H2O2

subject category

Chemistry

authors

Sousa, JLC; Santos, ICMS; Simoes, MMQ; Cavaleiro, JAS; Nogueira, HIS; Cavaleiro, AMV

our authors

foto Ana Maria Vieira Silva Viana Cavaleiro

Ana Maria Vieira Silva Viana Cavaleiro

Full professor
foto Helena Isabel Seguro Nogueira

Helena Isabel Seguro Nogueira

Assistant Professor with Aggregation
no photo

Isabel Cristina Maia da Silva Santos Vieira

Junior Researcher
foto Joana Lia Cardoso de Sousa

Joana Lia Cardoso de Sousa

Post-Doc Fellowship

Groups

G1 - Porous Materials and Nanosystems
G4 - Renewable Materials and Circular Economy

acknowledgements

Thanks are due to the University of Aveiro and FCT/FEDER for funding CICECO and QOPNA.

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Publication Details

type
Journal Article
year
2011
journal
CATALYSIS COMMUNICATIONS
volume
12
publisher
ELSEVIER SCIENCE BV
issn
1566-7367
issue
6
digital object identifier
10.1016/j.catcom.2010.11.005
web of science article identifier
WOS:000287289000016

Journal Metrics (JCR 2019)

Journal Impact Factor
3.612
Journal Impact Factor (5 yrs)
3.458
category normalized journal percentile
60.692

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