Size effect in the oxidation-reduction processes of platinum particles supported onto silicon dioxide

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dc.citation.epage809en_US
dc.citation.issueNumber6en_US
dc.citation.spage801en_US
dc.citation.volumeNumber56en_US
dc.contributor.authorSmirnov, M.Yu.en_US
dc.contributor.authorKalinkin, A.V.en_US
dc.contributor.authorVovk, E.I.en_US
dc.contributor.authorBukhtiyarov V.I.en_US
dc.date.accessioned2016-02-08T11:02:36Z
dc.date.available2016-02-08T11:02:36Z
dc.date.issued2015en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractThe interaction of the Pt/SiO2 model catalysts as thin films on the surface of tantalum supports with a mixture of NO + O2 (1: 1) was studied by X-ray photoelectron spectroscopy. The pressure of the reaction mixture was varied from 6 to 64 mbar, and the temperature was varied from room temperature to 500°C. Two types of the catalysts, in which the Pt/Si atomic ratios were ~0.1 and ~0.3 (0.1-Pt/SiO2 and 0.3-Pt/SiO2, respectively) according to the XPS data, were studied. In 0.1-Pt/SiO2, the particles of platinum predominantly had a size from 1 to 2.5 nm; a wide Pt particle size distribution in a range from 1 to 15 nm with a maximum at ~4 nm was characteristic of 0.3-Pt/SiO2. The interaction of all of the samples with NO + O2 at room temperature led to the dissolution of oxygen atoms in the bulk of platinum metal particles. As the reaction temperature was increased, PtO x platinum oxide particles were formed: from small Pt particles in 0.1-Pt/SiO2 at 300°C and from larger particles in 0.3-Pt/SiO2 at 400-500°C. It was established that the reactivity of platinum oxide particles toward hydrogen also depended on the particle size. The small particles of platinum oxide were converted into platinum metal under the action of hydrogen (16 mbar) at 300°C. The coarse particles of PtO x in the samples of 0.3-Pt/SiO2 were reduced much more easily starting with room temperature. © 2015 Pleiades Publishing, Ltd.en_US
dc.identifier.doi10.1134/S0023158415060129en_US
dc.identifier.issn231584
dc.identifier.urihttp://hdl.handle.net/11693/26630
dc.language.isoEnglishen_US
dc.publisherMaik Nauka Publishing / Springer SBMen_US
dc.relation.isversionofhttp://dx.doi.org/10.1134/S0023158415060129en_US
dc.source.titleKinetics and Catalysisen_US
dc.subjecthydrogenen_US
dc.subjectNO + O2en_US
dc.subjectplatinum oxidesen_US
dc.subjectsupported model catalystsen_US
dc.subjectX-ray photoelectron spectroscopyen_US
dc.titleSize effect in the oxidation-reduction processes of platinum particles supported onto silicon dioxideen_US
dc.typeArticleen_US

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