CO Dissociation and CO Hydrogenation on Smooth and Ion-Bombarded Pd(1 1 1): SFG and XPS Spectroscopy at mbar Pressures Full article
| Conference |
8th European Vacuum Conference and 2nd Annual Conference of the German Vacuum Society 23-26 Jun 2003 , Berlin |
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| Journal |
Applied Surface Science
ISSN: 0169-4332 |
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| Output data | Year: 2004, Volume: 235, Number: 1-2, Pages: 26-31 Pages count : 6 DOI: 10.1016/j.apsusc.2004.05.120 | ||||
| Tags | Carbon monoxide, Dissociation, High pressure, Hydrogen, Palladium, Sum frequency generation, X-ray photoelectron spectroscopy | ||||
| Authors |
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| Affiliations |
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Funding (3)
| 1 | German Academic Exchange Service | |
| 2 | German Research Foundation | SPP1091 |
| 3 | German Academic Exchange Service |
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(1 1 1) 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(1 1 1) produced carbonaceous deposits suggesting CHxO species as precursors for CO 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.
Cite:
Rupprechter G.
, Kaichev V.V.
, Unterhalt H.
, Morkel M.
, Bukhtiyarov V.I.
CO Dissociation and CO Hydrogenation on Smooth and Ion-Bombarded Pd(1 1 1): SFG and XPS Spectroscopy at mbar Pressures
Applied Surface Science. 2004. V.235. N1-2. P.26-31. DOI: 10.1016/j.apsusc.2004.05.120 WOS Scopus РИНЦ ANCAN OpenAlex
CO Dissociation and CO Hydrogenation on Smooth and Ion-Bombarded Pd(1 1 1): SFG and XPS Spectroscopy at mbar Pressures
Applied Surface Science. 2004. V.235. N1-2. P.26-31. DOI: 10.1016/j.apsusc.2004.05.120 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Published online: | Jul 28, 2004 |
| Published print: | Jul 31, 2004 |
Identifiers:
| Web of science: | WOS:000223964900005 |
| Scopus: | 2-s2.0-4344600688 |
| Elibrary: | 13449601 |
| Chemical Abstracts: | 2004:687727 |
| Chemical Abstracts (print): | 141:320557 |
| OpenAlex: | W2075886920 |