Promotion Effect Of Platinum On Golds Reactivity: A High-resolution Photoelectron Spectroscopy Study

dc.creatorPrieto M.J.
dc.creatorCarbonio E.A.
dc.creatorLanders R.
dc.creatorDe Siervo A.
dc.date2016
dc.date2017-08-17T19:09:56Z
dc.date2017-08-17T19:09:56Z
dc.date.accessioned2018-03-29T05:14:55Z
dc.date.available2018-03-29T05:14:55Z
dc.identifierJournal Of Physical Chemistry C. American Chemical Society, v. 120, n. 19, p. 10227 - 10236, 2016.
dc.identifier1932-7447
dc.identifier10.1021/acs.jpcc.5b08983
dc.identifierhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84971318218&doi=10.1021%2facs.jpcc.5b08983&partnerID=40&md5=c0a37e4dfa7285ce2b8653fffcb72e20
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/322933
dc.identifier2-s2.0-84971318218
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1357096
dc.descriptionThe reactivity of the Pt/Au(332) surface was studied using high-resolution photoelectron spectroscopy and carbon monoxide adsorption at 3.5 × 10-3 mbar. The characterization of Pt/Au(332) indicates the formation of a Au-Pt surface alloy at the topmost atomic layer of the (332) crystal due to an atomic exchange mechanism at both terrace and step edge. The amount of alloyed Au atoms has proven to be dependent on the amount of Pt deposited in the coverage range investigated. The activation of Au atoms by alloying is detected by comparing the ability of the surface to adsorb CO at high pressures. By analyzing the C 1s and O 1s photoemission lines it is possible to conclude that CO adsorption is both dissociative and molecular on the PtAu/Au(332) surface, differently from the behavior observed for Au and Pt single crystals. Also, by rising the temperature of the COads-PtAu/Au(332) surface, a dissociative reaction path is followed by the accumulation of graphitic carbon on the surface and the oxygen/carbon dioxide desorption. Thus, our results show not only the differential catalytic behavior of Pt@Au/Au(hkl) model surfaces but also that Au atoms have an active role on the reaction mechanism. © 2016 American Chemical Society.
dc.description120
dc.description19
dc.description10227
dc.description10236
dc.languageEnglish
dc.publisherAmerican Chemical Society
dc.relationJournal of Physical Chemistry C
dc.rightsfechado
dc.sourceScopus
dc.titlePromotion Effect Of Platinum On Golds Reactivity: A High-resolution Photoelectron Spectroscopy Study
dc.typeArtículos de revistas


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