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dc.contributor.authorAndreeva, D.en_US
dc.contributor.authorIvanov, I.en_US
dc.contributor.authorIlieva, L.en_US
dc.contributor.authorAbrashev, M. V.en_US
dc.contributor.authorZanella, R.en_US
dc.contributor.authorSobczak, J. W.en_US
dc.contributor.authorLisowski, W.en_US
dc.contributor.authorKantcheva, M.en_US
dc.contributor.authorAvdeev, G.en_US
dc.contributor.authorPetrov, K.en_US
dc.date.accessioned2016-02-08T10:04:36Z
dc.date.available2016-02-08T10:04:36Z
dc.date.issued2009en_US
dc.identifier.issn0926-860X
dc.identifier.urihttp://hdl.handle.net/11693/22776
dc.description.abstractGold catalysts based on ceria, doped by various RE metals (La, Sm, Gd, Yb, Y) were studied. The influence of the preparation methods on structure, properties and catalytic activity in the WGS reaction was investigated. The catalysts' supports were prepared using two different methods: co-precipitation (CP) and mechanochemical activation (MA). The catalysts were tested in a wide temperature interval without and after reactivation. All samples were characterized using a combination of X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Raman spectroscopy (RS) and X-ray photoelectron spectroscopy (XPS) and TPR. It was found that the catalytic activity of MA catalysts is higher than CP ones. The gold catalysts based on ceria doped by Yb and Sm exhibited the highest activity. After reactivation in air the MA samples almost kept the WGS activity same, while the CP catalysts increased it. The catalysts of a single- and double-phase structure are formed as a result of CP and MA preparation, respectively. There are no big differences in the gold particles size (2-3 nm) depending on dopants and on the preparation techniques. The RS spectra analysis indicates that most probably the oxygen vacancies are adjacent to Me3+ dopant and the ceria structure seems to be better ordered than in the case of alumina as a dopant. There is no distinct correlation between reducibility and WGS activity. The XPS analysis disclose positively charged gold particles in addition to metallic gold within a surface region of fresh samples and only metallic gold on the samples after catalytic processing. There is no simple correlation between the concentration of Ce3+ in the samples and their WGS activity.en_US
dc.language.isoEnglishen_US
dc.source.titleApplied Catalysis A: Generalen_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.apcata.2009.01.027en_US
dc.subjectCeria doped by Yb, Sm, Gd, Y, Laen_US
dc.subjectHRTEMen_US
dc.subjectTPRen_US
dc.subjectWGSen_US
dc.subjectXPSen_US
dc.subjectXRDen_US
dc.subjectCatalysisen_US
dc.subjectCatalyst activityen_US
dc.subjectCeriumen_US
dc.subjectCerium compoundsen_US
dc.subjectChemical shiften_US
dc.subjectDoping (additives)en_US
dc.subjectElectrochemical sensorsen_US
dc.subjectGadoliniumen_US
dc.subjectGolden_US
dc.subjectHigh resolution transmission electron microscopyen_US
dc.subjectInert gasesen_US
dc.subjectLanthanumen_US
dc.subjectNonferrous metalsen_US
dc.subjectOxygenen_US
dc.subjectOxygen vacanciesen_US
dc.subjectRapid solidificationen_US
dc.subjectSpectrum analysisen_US
dc.subjectX ray diffraction analysisen_US
dc.subjectX ray photoelectron spectroscopyen_US
dc.subjectYtterbiumen_US
dc.subjectYttrium alloysen_US
dc.subjectGold catalystsen_US
dc.subjectRamanen_US
dc.subjectCatalyst supportsen_US
dc.titleGold catalysts supported on ceria doped by rare earth metals for water gas shift reaction: influence of the preparation methoden_US
dc.typeArticleen_US
dc.departmentDepartment of Chemistry
dc.citation.spage159en_US
dc.citation.epage169en_US
dc.citation.volumeNumber357en_US
dc.citation.issueNumber2en_US
dc.identifier.doi10.1016/j.apcata.2009.01.027en_US
dc.identifier.eissn1873-3875


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