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dc.contributor.authorMartausová, Iveta
dc.contributor.authorSpustová, Daniela
dc.contributor.authorCvejn, Daniel
dc.contributor.authorMartaus, Alexandr
dc.contributor.authorLacný, Zdenek
dc.contributor.authorPřech, Jan
dc.date.accessioned2019-02-21T09:43:02Z
dc.date.available2019-02-21T09:43:02Z
dc.date.issued2019
dc.identifier.citationCatalysis Today. 2019, vol. 324, special issue, p. 144-153.cs
dc.identifier.issn0920-5861
dc.identifier.issn1873-4308
dc.identifier.urihttp://hdl.handle.net/10084/134076
dc.description.abstractTitanium-containing zeolite-based catalysts have been synthesized and investigated as catalysts in methyl (phenyl)sulfide oxidation with hydrogen peroxide. A hierarchical TS-1 prepared by the secondary templating and a layered TS-1 without and with silica and silica-titania pillars have been studied. Conventional TS-1 was a benchmarking material. The study focuses on observation of the different catalytic performance with regard to textural properties; presence and volume of mesopores and different diffusion characteristics. Thus, a deficiency and excess of the oxidizing agent were used in the catalysed reactions and the progress of reaction and selectivity to products were studied. All tested catalysts have shown after 240 min almost total conversion of methyl (phenyl)sulfide with different selectivity (substrate/catalyst mass ratio 10). It was observed that the reactants ratio hydrogen peroxide/ methyl(phenyl)sulfide influences the selectivity to sulfoxide or sulfone over a particular catalyst. In the case of hydrogen peroxide deficiency experiments (H2O2/sulfide = 0.5 mol/mol) the catalysts exhibited different distributions of products. Lamellar catalyst provided 100% selectivity to sulfoxide, the others in range of 90-65% selectivity to sulfoxide; however, the selectivity was independent on the reaction time and substrate conversion. In the case of the excess of the oxidant, except for Ti-pillared TS-1, all the catalysts showed stabile selectivity of 65% towards methyl(phenyl)sulfoxide being independent of the catalyst. The Ti-pillared TS-1 has shown, during the reaction progress, a decrease in the selectivity to sulfoxide from initial 60% to final 20% of sulfoxide at almost total conversion. The only case when higher selectivity to sulfone was achieved was gradual dosing of hydrogen peroxide.cs
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofseriesCatalysis Todaycs
dc.relation.urihttp://doi.org/10.1016/j.cattod.2018.07.003cs
dc.rights© 2018 Published by Elsevier B.V.cs
dc.subjectzeolitecs
dc.subjecttitanosilicatecs
dc.subjectselective oxidationcs
dc.subjecthydrogen peroxidecs
dc.subjectS-oxidationcs
dc.subjectmethyl(phenyl)sulfidecs
dc.titleCatalytic activity of advanced titanosilicate zeolites in hydrogen peroxide S-oxidation of methyl(phenyl)sulfidecs
dc.typearticlecs
dc.identifier.doi10.1016/j.cattod.2018.07.003
dc.type.statusPeer-reviewedcs
dc.description.sourceWeb of Sciencecs
dc.description.volume324cs
dc.description.lastpage153cs
dc.description.firstpage144cs
dc.identifier.wos000456316500018


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