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Medientyp:
E-Artikel
Titel:
The Adsorption of Oxygen and Coadsorption of CO and Oxygen on Structurally Well‐Defined PdAg Surface Alloys
Beteiligte:
Farkas, Arnold P.;
Diemant, Thomas;
Bansmann, Joachim;
Behm, R. Jürgen
Erschienen:
Wiley, 2012
Erschienen in:
ChemPhysChem, 13 (2012) 15, Seite 3516-3525
Sprache:
Englisch
DOI:
10.1002/cphc.201200477
ISSN:
1439-4235;
1439-7641
Entstehung:
Anmerkungen:
Beschreibung:
AbstractThe dissociative interaction of oxygen with structurally well‐defined monolayer PdxAg1−x/Pd(111) surface alloys of different compositions, with well‐known distributions of the respective surface atoms (A. K. Engstfeld et al., Phys. Chem. Chem. Phys. 2012, 14, 10754–10761), and the coadsorption of/reaction with CO on oxygen pre‐covered surfaces were studied by high‐resolution electron energy loss spectroscopy (HREELS) and temperature‐programmed desorption/reaction spectroscopy (TPD/TPR). The impact of geometric ensemble effects as well as electronic ligand and strain effects on the adsorption and reaction behaviour of the respective species on the bimetallic surfaces is elucidated and compared with related systems such as CO adsorption on similar surfaces and oxygen adsorption on a Pd67Ag33(111) bulk alloy surface. The data show a clear dominance of ensemble effects on the oxygen adsorption and CO coadsorption behaviour, with oxygen adsorption limited to threefold‐hollow sites on Pd3 sites, while the combined electronic effects, as evident from modifications in the adsorption and reaction characteristics on the Pd sites, are small.