Structural study of copper oxide supported on a ceria-modified titania catalyst system

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorFrancisco, M. S. P.
dc.creatorMastelaro, V. R.
dc.creatorFlorentino, A. O.
dc.creatorBazin, D.
dc.date2014-05-27T11:20:23Z
dc.date2016-10-25T21:25:29Z
dc.date2014-05-27T11:20:23Z
dc.date2016-10-25T21:25:29Z
dc.date2002-01-01
dc.date.accessioned2017-04-06T09:38:00Z
dc.date.available2017-04-06T09:38:00Z
dc.identifierTopics in Catalysis, v. 18, n. 1-2, p. 105-111, 2002.
dc.identifier1022-5528
dc.identifierhttp://hdl.handle.net/11449/132291
dc.identifierhttp://acervodigital.unesp.br/handle/11449/132291
dc.identifier10.1023/A:1013845314192
dc.identifierWOS:000175611400018
dc.identifier2-s2.0-0242443736
dc.identifierhttp://dx.doi.org/10.1023/A:1013845314192
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/942831
dc.descriptionA structural study of CuO supported on a CeO2-TiO2 system was undertaken using X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) techniques. The results of XRD revealed the presence of only two phases, TiO2 anatase and CeO2 cerianite. A trend towards smaller TiO2 crystallites was observed when cerium content increased. When the amount of cerium increased, Ti K-edge XANES analysis showed an increasing distortion of Ti sites. The results of Ce LIII-edge EXAFS showed that Ce atoms are coordinated by eight oxygen atoms at 2.32 Å. For the sample containing a small amount of cerium, the EXAFS analysis indicated that the local structure around Ce atoms was highly distorted. The catalysts presented quite different Cu K-edge XANES spectra compared to the spectra of the CuO and Cu2O reference compounds. The Cu-O mean bond length was close to that of the CuO and the Cu atoms in the catalysts are surrounded by approximately four oxygen atoms in their first shell. Copper supported on the ceria-modified titania support catalysts displayed a better performance in the methanol dehydrogenation when compared to copper supported only on titania or on ceria. © 2002 Plenum Publishing Corporation.
dc.languageeng
dc.publisherKluwer Academic/plenum Publ
dc.relationTopics in Catalysis
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCatalysts
dc.subjectCuO-CeO2-TiO2
dc.subjectStructure
dc.subjectXAS
dc.subjectXRD
dc.subjectCeO2-TiO2
dc.subjectCerium content
dc.subjectCu atoms
dc.subjectCu K-edge
dc.subjectEXAFS
dc.subjectLocal structure
dc.subjectMethanol dehydrogenation
dc.subjectOxygen atom
dc.subjectReference compounds
dc.subjectStructural studies
dc.subjectTiO2 anatase
dc.subjectTitania
dc.subjectTitania catalysts
dc.subjectTitania supports
dc.subjectXANES analysis
dc.subjectXANES spectra
dc.subjectCerium
dc.subjectCerium compounds
dc.subjectCopper
dc.subjectMethanol
dc.subjectOxygen
dc.subjectSemiconducting bismuth compounds
dc.subjectStructure (composition)
dc.subjectTitanium dioxide
dc.subjectX ray absorption spectroscopy
dc.subjectX ray diffraction
dc.subjectAtoms
dc.titleStructural study of copper oxide supported on a ceria-modified titania catalyst system
dc.typeOtro


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