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Hydrogen-induced CO displacement from the Pt(111) surface: an isothermal kinetic study

dc.contributor.authorParker, Deborah Holmesen_US
dc.contributor.authorFischer, Daniel A.en_US
dc.contributor.authorColbert, Jeffen_US
dc.contributor.authorKoel, Bruce E.en_US
dc.contributor.authorGland, John L.en_US
dc.date.accessioned2006-04-10T14:31:17Z
dc.date.available2006-04-10T14:31:17Z
dc.date.issued1991-11-02en_US
dc.identifier.citationParker, Deborah Holmes, Fischer, Daniel A., Colbert, Jeff, Koel, Bruce E., Gland, John L. (1991/11/02)."Hydrogen-induced CO displacement from the Pt(111) surface: an isothermal kinetic study." Surface Science 258(1-3): 75-81. <http://hdl.handle.net/2027.42/29038>en_US
dc.identifier.urihttp://www.sciencedirect.com/science/article/B6TVX-46T3BSB-24G/2/ccdf7d9ce8e8c047855a4d1a5148abaden_US
dc.identifier.urihttps://hdl.handle.net/2027.42/29038
dc.description.abstractChemisorbed CO can be completely removed from the Pt(111) surface in the temperature range 318 to 348 K for hydrogen pressures above 2 x 10-2 Torr. Thermal desorption of CO in this temperature range in the absence of hydrogen removes only a fraction of the adsorbed CO. A series of in situ isothermal kinetic experiments are presented in this paper which show that CO displacement in the presence of 0.2 Torr of hydrogen is a first-order process in CO coverage with an activation energy of 10.9 kcal/mol. We propose that the origin of this effect is that repulsive intereactions between coadsorbed atomic hydrogen and carbon monoxide induce high desorption rates of CO characteristic of high CO coverages, presumably due to lower values of the desorption activation energy. The importance of these results is to show that high coverages of coadsorbed hydrogen resulting from substantial overpressures of H2 may substantially modify desorption activation energies, and thus the coverages and kinetic pathways available, even for strongly chemisorbed species. These phenomena may play an important role in surface reactions which occur at high pressure.en_US
dc.format.extent594470 bytes
dc.format.extent3118 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherElsevieren_US
dc.titleHydrogen-induced CO displacement from the Pt(111) surface: an isothermal kinetic studyen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelMaterials Science and Engineeringen_US
dc.subject.hlbsecondlevelChemistryen_US
dc.subject.hlbsecondlevelChemical Engineeringen_US
dc.subject.hlbsecondlevelBiological Chemistryen_US
dc.subject.hlbtoplevelEngineeringen_US
dc.subject.hlbtoplevelScienceen_US
dc.subject.hlbtoplevelHealth Sciencesen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USAen_US
dc.contributor.affiliationotherDepartment of Chemistry and Biochemistry and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309-0216, USAen_US
dc.contributor.affiliationotherExxon PRT, NSLS, Brookhaven National Laboratory, Upton, NY 11973, USAen_US
dc.contributor.affiliationotherInstrumentation Division, Brookhaven National Laboratory, Upton, NY 11973, USAen_US
dc.contributor.affiliationotherDepartment of Chemistry and Biochemistry and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309-0216, USAen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/29038/1/0000071.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1016/0039-6028(91)90902-5en_US
dc.identifier.sourceSurface Scienceen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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