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



  history
ID: 267055.0, Fritz-Haber-Institut / Physical Chemistry
Interaction of hydrogen with RuO2(110) surfaces: Activity differences between various oxygen species
Authors:Jacobi, Karl; Wang, Yuemin; Ertl, Gerhard
Language:English
Date of Publication (YYYY-MM-DD):2006-03-30
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem. B
Volume:110
Issue / Number:12
Start Page:6115
End Page:6122
Copyright:© 2006 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The interaction of hydrogen with RuO2(110) surfaces was studied by means of thermal desorption and vibration spectroscopies. The stoichiometric surface exposes two types of coordinatively unsaturated atoms: double-bonded O-bridge and five-fold-bonded Ru-cus, while at the O-rich surface the Ru-cus atoms are covered with single-bonded O-cus. On the stoichiometric RuO2(110) surface at 90 K, H-2, either adsorbs molecularly on Ru-cus sites or dissociates and forms with O-bridge an H2O-like surface group. If, in addition, also O-cus is present at the surface, hydrogen interacts exclusively with this species forming H2O-Cus. This demonstrates that hydrogen reacts much more readily with O-cus than with O-bridge as expected from the reduced bond order and smaller binding energy of O-cus. It is furthermore shown that at surface temperatures below 90 K free coordinatively unsaturated Ru-cus sites are needed to activate the incoming H, molecules prior to any reaction with O-cus or O-bridge. Generally, Ru-cus sites play a key role for reactions of a number of molecules at the RuO2(110) surface. These findings are supported by recent DFT-based calculations but are at variance with other reports.
Free Keywords:Ruthenium dioxide; Hydrogen; Adsorption; Catalysis; Reaction intermediates; High-resolution electron energy-loss spectroscopy (HREELS); Thermal desorption Spectroscopy (TDS); CO Oxidation; Adsorption; Oxide; Reactivity; Ruthenium; Mechanism; Pressure; Catalyst
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Wang Y, Physical Chemistry I, Ruhr-University Bochum, D-44780 Bochum, Germany
Identifiers:URL:http://pubs.acs.org/cgi-bin/abstract.cgi/jpcbfk/20...
DOI:10.1021/jp056341m
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