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  CO dissociation and CO hydrogenation on smooth and ion-bombarded Pd(111): SFG and XPS spectroscopy at mbar pressures

Rupprechter, G., Kaichev, V. V., Unterhalt, H., Morkel, M., & Bukhtiyarov, V. I. (2004). CO dissociation and CO hydrogenation on smooth and ion-bombarded Pd(111): SFG and XPS spectroscopy at mbar pressures. Applied Surface Science, 235(1-2), 26-31. doi:10.1016/j.apsusc.2004.05.120.

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 Creators:
Rupprechter, Günther1, Author              
Kaichev, Vasiliy V.2, Author              
Unterhalt, Holger1, Author              
Morkel, Matthias1, Author              
Bukhtiyarov, Valerii I., Author
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: Carbon monoxide; Hydrogen; Palladium; Dissociation; Sum frequency generation; X-ray photoelectron spectroscopy; High pressure
 Abstract: The CO dissociation probability on transition metals is often invoked to explain the product distribution (selectivity) of catalytic CO hydrogenation. Along these lines, we have investigated CO adsorption and dissociation on smooth and ion-bombarded Pd(111) at pressures up to 1 mbar using vibrational sum frequency generation (SFG) and X-ray photoelectron spectroscopy (XPS). Under high pressure, CO adsorbate structures were observed that were identical to high-coverage structures in UHV. On ion-bombarded surfaces an additional species was detected which was attributed to CO bridge bonded to defect (low-coordinated) sites. On both surfaces, no indications of CO dissociation were found even after hours of 0.1 mbar CO exposure. However, exposing CO/H2 mixtures to ion-bombarded Pd(111) produced carbonaceous deposits suggesting CHxO species as precursors for C–O bond cleavage and that the formation of CHxO is facilitated by surface defects. The relevance of the observations for CO hydrogenation on Pd catalysts is discussed.

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Language(s): eng - English
 Dates: 2004-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 222932
DOI: 10.1016/j.apsusc.2004.05.120
 Degree: -

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Title: Applied Surface Science
Source Genre: Journal
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Publ. Info: Amsterdam : North-Holland
Pages: - Volume / Issue: 235 (1-2) Sequence Number: - Start / End Page: 26 - 31 Identifier: ISSN: 0169-4332
CoNE: https://pure.mpg.de/cone/journals/resource/954928576736