| Influence of coadsorbed hydrogen on ethylene adsorption and reaction on a (radical3 x radical3)R30 degrees-Sn/Pt(111) surface alloy. | |
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MedLine Citation:
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PMID: 15667176 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The effect of surface-bound hydrogen adatoms on adsorption, desorption, and reaction of ethylene (CH(2)=CH(2)) on a (radical3 x radical3)R30 degrees-Sn/Pt(111) surface alloy with theta(Sn) = 0.33 was investigated by using temperature-programmed desorption (TPD) and Auger electron spectroscopy (AES). Preadsorbed H decreased the saturation coverage of chemisorbed ethylene and less H was required to completely block ethylene chemisorption on this alloy than that on Pt(111). This is also the first report of extensive H site-blocking of ethylene chemisorption on Pt(111). Preadsorbed H also decreased the desorption activation energy of ethylene on the alloy surface. The reaction chemistry of ethylene on this Sn/Pt(111) alloy is dramatically different than on the Pt(111) surface: the H-addition reaction channel taking ethylene to ethane on Pt(111) is totally inhibited on the alloy. This is important information for advancing understanding of the surface chemistry involved in hydrogenation and dehydrogenation catalysis. |
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Authors:
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Haibo Zhao; Bruce E Koel |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Langmuir : the ACS journal of surfaces and colloids Volume: 21 ISSN: 0743-7463 ISO Abbreviation: Langmuir Publication Date: 2005 Feb |
Date Detail:
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Created Date: 2005-01-25 Completed Date: 2006-05-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882736 Medline TA: Langmuir Country: United States |
Other Details:
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Languages: eng Pagination: 971-5 Citation Subset: - |
Affiliation:
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Department of Chemistry, University of Southern California, Los Angeles, CA 90089-0482, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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