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Issue 36, 2010
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Role of hydrogen in olefin isomerization and hydrogenation: a molecular beam study on Pd model supported catalysts

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Abstract

The role of surface, and subsurface hydrogen species in olefin cis-trans isomerization and hydrogenation over a model Pd/Fe3O4/Pt(111) catalyst was investigated by pulsed molecular beam experiments and infrared reflection-absorption spectroscopy. We show that non-equivalent hydrogen species are involved in the two reaction pathways: whereas cis-trans isomerization proceeds with the surface hydrogen species, the presence of hydrogen absorbed in the subsurface region of Pd particles is required for the hydrogenation pathway. The activity and selectivity toward both reaction channels was found to significantly change on Pd particles when they are modified with strongly dehydrogenated carbonaceous deposits. Sustained hydrogenation activity was observed only on C-precovered particles, whereas sustained cis-trans isomerization proceeds on both C-free and C-containing catalyst. We discuss the possible microscopic origins of this effect.

Graphical abstract: Role of hydrogen in olefin isomerization and hydrogenation: a molecular beam study on Pd model supported catalysts

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Publication details

The article was received on 15 Feb 2010, accepted on 20 Apr 2010 and first published on 29 May 2010


Article type: Paper
DOI: 10.1039/C003133J
Citation: Dalton Trans., 2010,39, 8484-8491
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    Role of hydrogen in olefin isomerization and hydrogenation: a molecular beam study on Pd model supported catalysts

    W. Ludwig, A. Savara and S. Schauermann, Dalton Trans., 2010, 39, 8484
    DOI: 10.1039/C003133J

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