You are in the accessibility menu

Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/19044
Full metadata record
DC FieldValueLanguage
dc.contributor.authorRodella, C. B.-
dc.contributor.authorNascente, PAP-
dc.contributor.authorFranco, RWA-
dc.contributor.authorMagon, C. J.-
dc.contributor.authorMastelaro, V. R.-
dc.contributor.authorFlorentino, A. O.-
dc.date.accessioned2014-05-20T13:53:22Z-
dc.date.accessioned2016-10-25T17:03:57Z-
dc.date.available2014-05-20T13:53:22Z-
dc.date.available2016-10-25T17:03:57Z-
dc.date.issued2001-09-16-
dc.identifierhttp://dx.doi.org/10.1002/1521-396X(200109)187:1<161-
dc.identifier.citationPhysica Status Solidi A-applications and Materials Science. Malden: Wiley-blackwell, v. 187, n. 1, p. 161-169, 2001.-
dc.identifier.issn1862-6300-
dc.identifier.urihttp://hdl.handle.net/11449/19044-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/19044-
dc.description.abstractSamples of the V(2)O(5)/TiO(2) system were prepared by the sol-gel method and calcined at different temperatures. Surface species of vanadium, their dispersion, as well as the structural evolution of the system were analysed by XRD, Raman, EPR, and XPS techniques. The results of XRD showed the evolution of TiO(2) from anatase phase to rutile. phase. The Raman spectra for calcination temperatures up to 500 degreesC showed a good dispersion of vanadium over titania in the form of monomeric vanadyl groups (V(4+)) and polymeric vanadates (V(5+)). At least three families of V4+ ions were identified by EPR investigations. Two kinds of isolated V(4+) species are placed in sites of octahedral symmetry, substituting Ti(4+) in the rutile phase. The third is formed by pairs of V(4+) species on the surface of titania. Above 500 degreesC part of superficial V(4+) is inserted into the,matrix of titania and part is oxidized to V(5+). The XPS results showed that the V/Ti ratio rises with increasing calcination temperature, indicating a smaller dispersion of vanadium.en
dc.format.extent161-169-
dc.language.isoeng-
dc.publisherWiley-Blackwell-
dc.sourceWeb of Science-
dc.titleSurface characterisation of V(2)O(5)/TiO(2) catalytic systemen
dc.typeoutro-
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv Fed Sao Carlos, Dept Mat Engn, Ctr Caracterizacao & Desenvolvimento Mat, BR-13565905 Sao Carlos, SP, Brazil-
dc.description.affiliationUniv São Paulo, Inst Fis Sao Carlos, Dept Fis & Ciência Mat, BR-13560970 Sao Carlos, SP, Brazil-
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, Dept Quim, BR-18618000 Botucatu, SP, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, Dept Quim, BR-18618000 Botucatu, SP, Brazil-
dc.identifier.doi10.1002/1521-396X(200109)187:1<161-
dc.identifier.wosWOS:000171458000021-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPhysica Status Solidi A: Applications and Materials Science-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

There are no files associated with this item.
 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.