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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 336694.0, Fritz-Haber-Institut / Inorganic Chemistry
The Roles of Subsurface Carbon and Hydrogen in Palladium-Catalyzed Alkyne Hydrogenation
Authors:Teschner, Detre; Borsodi, Janos; Wootsch, A; Revay, Zsolt; Hävecker, Michael; Knop-Gericke, Axel; Jackson, S. David; Schlögl, Robert
Research Context:Catalytic Hydrogenation
Date of Publication (YYYY-MM-DD):2008-04-04
Title of Journal:Science
Journal Abbrev.:Science
Issue / Number:5872
Start Page:86
End Page:89
Copyright:Copyright 2008 by the American Association for the Advancement of Science; all rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Alkynes can be selectively hydrogenated to alkenes on solid palladium catalysts. This process requires a strong modification of the near-surface region of Pd, in which carbon (from fragmented feed molecules) occupies interstitial lattice sites. In situ x-ray photoelectron spectroscopic measurements under reaction conditions indicate that much less carbon is dissolved in Pd during unselective, total hydrogenation. Additional studies of hydrogen content with in situ prompt gamma activation analysis, which allows us to follow the hydrogen content of Pd during catalysis, indicate that unselective hydrogenation proceeds on hydrogen-saturated -hydride, whereas selective hydrogenation was only possible after decoupling bulk properties from the surface events. Thus the population of subsurface sites of Pd, either by hydrogen or by carbon, governs the hydrogenation events on the surface.
Free Keywords:Heterogeneous catalysis; Selective hydrogenation; In situ XPS; In situ Prompt Gamma Activation Analysis
Last Change of the Resource (YYYY-MM-DD):2008-02-29
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
Fritz-Haber-Institut/Inorganic Chemistry/Surface Analysis
External Affiliations:Institute of Isotopes, Hung. Acad. Sci., POB 77, Budapest, H-1525, Hungary
WestCHEM, Department of Chemistry, University of Glasgow, Glasgow, G128QQ, Scotland, UK
Identifiers:URL:http://dx.doi.org/10.1126/science.1155200 [only subscribers]
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