Please note that eDoc will be permanently shut down in the first quarter of 2021!      Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Quick Search
My eDoc
Session History
Support Wiki
Direct access to
document ID:

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

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
Date of Publication (YYYY-MM-DD):2006-03-30
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem. B
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
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.