Transient CO adsorption and the catalytic properties of surfaces - art. no. 081404

Authors
Rocca, M Vattuone, L Savio, I de Mongeot, FB Valbusa, U Comelli, G Lizzit, S Baraldi, A Paolucci, G Groeneveld, JA Baerends, EJ
Citation
M. Rocca et al., Transient CO adsorption and the catalytic properties of surfaces - art. no. 081404, PHYS REV B, 6308(8), 2001, pp. 1404
Citations number
25
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6308
Issue
8
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010215)6308:8<1404:TCAATC>2.0.ZU;2-M
Abstract
We show that in presence of subsurface oxygen, CO oxidation of oxygen preco vered Ag(001) modifies the surface in such a way that CO adsorption is stab ilized up to crystal temperatures of 160 K. When diffusion is activated new surface oxide phases form, characterized by oxygen both in surface and in subsurface sites and by a high density of slates just below the Fermi level . Subsurface oxygen accumulation might therefore be relevant for the unders tanding of the origin of the pressure gap observed for ethylene epoxidation and other important catalytic reactions.