Carbon-supported metal-modified lacunary tungstosilicic polyoxometallates used as catalysts in the selective oxidation of sulfides

cic.lugarDesarrolloCentro de Investigación y Desarrollo en Ciencias Aplicadas es
dc.titleCarbon-supported metal-modified lacunary tungstosilicic polyoxometallates used as catalysts in the selective oxidation of sulfidesen
dcterms.abstractLacunary tungstosilicic polyoxometallates modified with transition metal ions [SiW11O39M(H2O)]6−, where M=Mn2+, Fe2+, Co2+or Cu2+, were synthesized and supported on activated carbon to obtain the SiW11MC catalysts. The samples were characterized by FT-IR, XRD, N2 adsorption–desorption measurements, and the acidic properties were determined using the isopropanol dehydration test reaction. The activity and selectivity of the catalysts were evaluated in the selective oxidation of a series of sulfides to sulfoxides or sulfone. The reaction was carried out in acetonitrile as solvent using H2O2 35% p/V as a clean oxidant. The conversion values decreased in the following order: SiW11MnC> SiW11FeC > SiW11CuC > SiW11CoC. The catalysts were reused without appreciable loss of their catalytic activity. It was found that the activity of the catalysts decreases in parallel with the increment in the reduction temperature values. The most easily reducible catalyst displayed the highest conversion values. We found a convenient and selective procedure for oxidizing sulfides to sulfoxides or sulfones using aqueous hydrogen peroxide and a catalytic amount of lacunary tungstosilicic polyoxometallates supported on carbon at low temperatures (20–50 ◦C) in a reasonably short reaction time.en
dcterms.creator.authorFrenzel, Rominaes
dcterms.creator.authorSathicq, Ángel
dcterms.creator.authorBlanco, Mirta Noemíes
dcterms.creator.authorRomanelli, Gustavoes
dcterms.creator.authorPizzio, Luis Renées
dcterms.extentp. 27-36es
dcterms.identifier.urlRecurso onlinees
dcterms.isPartOf.issuevol. 403es
dcterms.isPartOf.seriesJournal of Molecular Catalysis A: Chemicales
dcterms.licenseAttribution-NonCommercial-NoDerivatives 4.0 International (BY-NC-ND 4.0)es
dcterms.subjectSupported metal-substituted polyoxometallatesen
dcterms.subjectSulfide oxidationen
dcterms.subjectHydrogen peroxideen
dcterms.subject.materiaBiología Marina, Limnologíaes
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