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



ID: 211187.0, Fritz-Haber-Institut / Physical Chemistry
Inhibition of CO oxidation on RuO2(110) by adsorbed H2O molecules
Authors:Paulus, Ursula A.; Wang, Yuemin; Kim, Sang Hoon; Geng, Peter; Wintterlin, Joost; Jacobi, Karl; Ertl, Gerhard
Language:English
Date of Publication (YYYY-MM-DD):2004-12-08
Title of Journal:Journal of Chemical Physics
Journal Abbrev.:J. Chem. Phys.
Volume:121
Issue / Number:22
Start Page:11301
End Page:11308
Copyright:© 2004 American Institute of Physics
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Catalytic CO oxidation on the RuO2(110) surface was studied at 300 K by scanning tunneling microscopy (STM), high-resolution electron-energy-loss spectroscopy (HREELS), and thermal desorption spectroscopy (TDS). Upon repeatedly exposing the surface to several 10 L of CO and O2 at 300 K, STM shows that unreactive features accumulate with each CO and O2 titration run. HREELS and TDS show formation of increasing amounts of H2O, retarded formation of O-cus atoms and incomplete removal of CO-bridge molecules during O2 dosing, and a changing ratio of single- and double-bonded CO-bridge molecules. It is concluded that H2O (presumably from the residual gas) is accumulating at the Ru-cus sites thus blocking them, so that the dissociative adsorption of oxygen is prevented and the CO oxidation reaction is suppressed. Some 10% CO- bridge remains on the surface even during oxygen exposure. Consistent with this interpretation, deactivation of the surface is suppressed at 350 K, at the onset of H2O desorption.
Free Keywords:oxidation; rubidium compounds; adsorbed layers; scanning tunnelling microscopy; electron energy loss spectra; thermally stimulated desorption; adsorption; carbon compounds; scanning-tunneling-microscopy; carbon-monoxide; surface; adsorption; oxygen
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Wintterlin J, Dept. Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 11, Haus E, D-81377 München, Germany
Identifiers:URL:http://scitation.aip.org/getabs/servlet/GetabsServ...
DOI:10.1063/1.1812745
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