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- Title
Activation of the C-O bond on the surface of palladium: AnIn situstudy by X-ray photoelectron spectroscopy and sum frequency generation.
- Authors
Kaichev, V.; Bukhtiyarov, V.; Rupprechter, G.; Freund, H.-J.
- Abstract
Anin situstudy of the adsorption of CO on atomically smooth and defect Pd(111) surfaces was performed over wide ranges of temperatures (200-400 K) and pressures (10-6-1 mbar) by X-ray photoelectron spectroscopy and sum frequency generation. Both of the techniques indicated that CO was adsorbed as three-fold hollow, bridging, and terminal species to form well-known ordered structures on the surface. In the course of thein situexperiments, no signs of CO dissociation or of the formation of carbonyl structures (Pd(CO)n,n>1) were detected. The mechanism of C-O bond activation in the course of methanol decomposition on the surface of palladium was considered. It was found that the adsorption of methanol on the surface of palladium essentially depends on pressure. Along with the well-known reaction path of methanol dehydrogenation to CO and hydrogen, a slow process of methanol decomposition with C-O bond cleavage was observed at elevated pressures. In this case, the formation of carbon deposits finally resulted in the carbonization and complete deactivation of the surface. A mechanism for C-O bond activation on the surface of palladium was proposed; the geometry of adsorption complexes plays an important role in this mechanism.
- Subjects
PHOTOELECTRON spectroscopy; CARBONYL compounds; PALLADIUM; PLATINUM group; METHANOL; ALCOHOLS (Chemical class)
- Publication
Kinetics & Catalysis, 2005, Vol 46, Issue 2, p269
- ISSN
0023-1584
- Publication type
Article
- DOI
10.1007/s10975-005-0073-0