Spectroscopic characterization of gold supported on tungstated zirconia

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dc.citation.epage47en_US
dc.citation.issueNumber1en_US
dc.citation.spage39en_US
dc.citation.volumeNumber187en_US
dc.contributor.authorKantcheva, M.en_US
dc.contributor.authorMilanova, M.en_US
dc.contributor.authorAvramova, I.en_US
dc.contributor.authorMametsheripov, S.en_US
dc.date.accessioned2016-02-08T09:46:05Z
dc.date.available2016-02-08T09:46:05Z
dc.date.issued2012en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractGold catalysts supported on tungstated zirconia (containing 5–20 wt% WO3) are prepared by cationic adsorption from aqueous solution of [Au(en)2]Cl3 complex. The materials are characterized by XRD, DRUV–vis spectroscopy and XPS. The nature of the deposited gold species is studied by FT-IR spectroscopy of adsorbed CO. It is concluded that the gold particles occupy preferentially the WOx-free zirconia surface and the dispersion of gold depends on the amount of coodinatively unsaturated (cus) Zr4+ ions. Modification of zirconia by tungsten increases the gold uptake but at the same time causes decrease in the concentration of (cus) Zr4+ ions thus lowering the dispersion of gold clusters. According to the results of in situ FT-IR spectroscopy, the Au/WOx ZrO2 catalysts display higher activity in the CO oxidation in the low-temperature range (up to 150 ◦C) than the WOx-free Au/ZrO2 sample. The low-temperature activity of the W-containing catalysts could be associated with decreased basicity of the support oxide ions resulting in reduced accumulation of stable carbonate species.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T09:46:05Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2012en
dc.identifier.doi10.1016/j.cattod.2012.02.027en_US
dc.identifier.eissn1873-4308
dc.identifier.issn0920-5861
dc.identifier.urihttp://hdl.handle.net/11693/21422
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.cattod.2012.02.027en_US
dc.source.titleCatalysis Todayen_US
dc.subjectDR-UV-vis spectroscopyen_US
dc.subjectGold supported on tungstated zirconiaen_US
dc.subjectIn situ FT-IR spectroscopy of adsorbed COen_US
dc.subjectXPSen_US
dc.subjectXRDen_US
dc.subjectCO + O 2en_US
dc.titleSpectroscopic characterization of gold supported on tungstated zirconiaen_US
dc.typeArticleen_US

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