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Chemical and structural characterization of V2O5/TiO2 catalysts

dc.contributor.authorRodella, C. B.
dc.contributor.authorNascente, PAP
dc.contributor.authorMastelaro, V. R.
dc.contributor.authorZucchi, M. R.
dc.contributor.authorFranco, RWA
dc.contributor.authorMagon, C. J.
dc.contributor.authorDonoso, P.
dc.contributor.authorFlorentino, A. O.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:53:21Z
dc.date.available2014-05-20T13:53:21Z
dc.date.issued2001-07-01
dc.description.abstractA series of V2O5/TiO2 samples was synthesized by sol-gel and impregnation methods with different contents of vanadia. These samples were characterized by x-ray diffraction (XRD), Raman spectroscopy, x-ray photoelectron spectroscopy (XPS), and electronic paramagnetic resonance (EPR). XRD detected rutile as the predominant phase for pure TiO2 prepared by the sol-gel method. The structure changed to anatase when the vanadia loading was increased. Also, anatase was the predominant phase for samples obtained by the impregnation method. Raman measurements identified two species of surface vanadium: monomeric vanadyl (V4+) and polymeric vanadates (V5+). XPS results indicated that Ti ions were in octahedral position surrounded by oxygen ions. The V/Ti atomic ratios showed that V ions were highly dispersed on the vanadia/titania surface obtained by the sol-gel method. EPR analysis detected three V4+ ion types: two of them were located in axially symmetric sites substituting for Ti4+ ions in the rutile structure, and the third one was characterized by magnetically interacting V4+ ions in the form of pairs or clusters. A partial oxidation of V4+ to V5+ was evident from EPR analysis for materials with higher concentrations of vanadium. (C) 2001 American Vacuum Society.en
dc.description.affiliationUniv São Paulo, Inst Fis Sao Carlos, Dept Fis & Ciência Mat, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Fed Sao Carlos, Dept Mat Engn, Ctr Caracterizacao & Desenvolvimento Mat, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Quim, Inst Biociencias, BR-1861800 Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Quim, Inst Biociencias, BR-1861800 Botucatu, SP, Brazil
dc.format.extent1158-1163
dc.identifierhttp://dx.doi.org/10.1116/1.1380720
dc.identifier.citationJournal of Vacuum Science & Technology A-vacuum Surfaces and Films. Melville: Amer Inst Physics, v. 19, n. 4, p. 1158-1163, 2001.
dc.identifier.doi10.1116/1.1380720
dc.identifier.fileWOS000170110900024.pdf
dc.identifier.issn0734-2101
dc.identifier.urihttp://hdl.handle.net/11449/19039
dc.identifier.wosWOS:000170110900024
dc.language.isoeng
dc.publisherAmerican Institute of Physics (AIP)
dc.relation.ispartofJournal of Vacuum Science & Technology A-vacuum Surfaces and Films
dc.relation.ispartofjcr1.761
dc.relation.ispartofsjr0,520
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.titleChemical and structural characterization of V2O5/TiO2 catalystsen
dc.typeArtigo
dcterms.licensehttp://publishing.aip.org/authors/web-posting-guidelines
dcterms.rightsHolderAmer Inst Physics
dspace.entity.typePublication
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Botucatupt
unesp.departmentQuímica e Bioquímica - IBBpt

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