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- Title
Selective Oxidation with Aqueous Hydrogen Peroxide by [PO<sub>4</sub>{WO(O<sub>2</sub>)<sub>2</sub>}<sub>4</sub>]<sup>3−</sup> Supported on Zinc-Modified Tin Dioxide.
- Authors
Nojima, Susumu; Kamata, Keigo; Suzuki, Kosuke; Yamaguchi, Kazuya; Mizuno, Noritaka
- Abstract
We prepared supported phosphorus-containing tetranuclear peroxotungstate ([PO4{WO(O2)2}4]3−, denoted by PW4) catalysts by using zinc-modified SnO2 supports with different zinc contents [PW4-Zn( x)/SnO2, in which x denotes the zinc content (wt %)]. The supported catalysts, in particular PW4-Zn(0.8)/SnO2, could act as efficient and reusable heterogeneous catalysts for selective oxidation with aqueous H2O2 as the terminal oxidant. The catalytic performance of PW4-Zn(0.8)/SnO2 was much superior to those of the corresponding homogeneous analogue THA3PW4 (THA=tetra- n-hexylammonium) and the previously reported tungstate-based heterogeneous catalysts such as our W-Zn/SnO2. In the presence of PW4-Zn(0.8)/SnO2, various types of organic substrates such as alkenes, amines, silanes, and sulfides could be converted into the corresponding oxygenated products in high to excellent yields by using near-stoichiometric amounts of H2O2 with respect to the substrates (typically 1.2 equiv.). The PW4 species interacting with highly dispersed Zn2+ species on SnO2 likely plays an important role in the present oxidation.
- Subjects
STANNIC oxide; POLYOXOTUNGSTATES; HYDROGEN peroxide; ZINC; OXIDATION kinetics; POLYOXOMETALATES; PHOSPHATE derivatives; HETEROGENEOUS catalysis
- Publication
ChemCatChem, 2015, Vol 7, Issue 7, p1097
- ISSN
1867-3880
- Publication type
Article
- DOI
10.1002/cctc.201402975