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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents



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ID: 289288.0, Fritz-Haber-Institut / Physical Chemistry
Adsorption and reaction of CO on RuO2(110) surfaces
Authors:Wang, Jinhai; Fan, Chao Yang; Jacobi, Karl; Ertl, Gerhard
Language:English
Date of Publication (YYYY-MM-DD):2001-06-10
Title of Journal:Surface Science
Journal Abbrev.:Surf. Sci.
Volume:481
Issue / Number:1-3
Start Page:113
End Page:118
Copyright:© 2001 Elsevier Science B.V. All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:RuO2(1 1 0) single crystal surfaces were prepared by exposing a Ru(0 0 0 1) surface to high doses of O2 at 700 K. This surface exhibits coordinatively unsaturated (cus) Ru atoms (Ru-cus) onto which CO may adsorb at 85 K. Actually, high resolution electron energy loss spectroscopy reveals an energy of 262 meV (2115 cm-1) for the C–O stretch vibration of adsorbed CO indicating relatively weak binding in terminal configuration on Ru-cus. Thermal desorption spectroscopy shows partial desorption for temperatures above 250 K and, in parallel, formation of CO2 through reaction with neighboring surface oxygen atoms called O-bridge. Thereby, underlying Ru atoms become accessible onto which CO adsorbs more strongly giving rise to CO stretch-mode energies of 235 (1895) and 245 (1975) meV (cm-1). Hence, above 250 K, Ru-cus is not able to stabilize CO but serves as transient source for CO (and presumably other adsorbates), thus enabling the remarkable catalytic activity of this surface.
Free Keywords:Electron energy loss spectroscopy (EELS); Thermal desorption spectroscopy; Catalysis; Chemisorption; Oxidation; Surface chemical reaction; Ruthenium; Carbon monoxide
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
Identifiers:URL:http://www.sciencedirect.com/science?_ob=ArticleUR...
DOI:10.1016/S0039-6028(01)01017-2
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