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

ID: 289259.0, Fritz-Haber-Institut / Physical Chemistry
Oxidation reactions over RuO2: A comparative study of the reactivity of the (110) single crystal and polycrystalline surfaces
Authors:Madhavaram, Hima; Idriss, Hicham; Wendt, Stefan; Kim, Young Dok; Knapp, Marcus; Over, Herbert; Aßmann, Jens; Löffler, Elke; Muhler, Martin
Date of Publication (YYYY-MM-DD):2001-09-10
Title of Journal:Journal of Catalysis
Journal Abbrev.:J. Catal.
Issue / Number:2
Start Page:296
End Page:307
Copyright:© 2001 Academic Press
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The present work is devoted to the investigation of oxidation reactions over RuO2 surfaces. Two main points are addressed. First, on the fundamental level, a detailed investigation of the site requirement for CO (as well as for methanol) and O2 adsorption on the surface of a well-defined RuO2(110) crystal is conducted. Second, a comparison with polycrystalline RuO2 toward these oxidation reactions is presented. Both results, those in UHV over RuO2(110) and those at atmospheric pressure over polycrystalline RuO2, agree fairly well. This indicates that the surface chemistry of the (110) single crystal is very similar to that of the polycrystalline material. Both the activity of the RuO2(110) surface in the UHV regime and the activity of polycrystalline RuO2 in the high-pressure regime were investigated by temperature-programmed desorption and by X-ray photoelectron spectroscopy. The reasons for the unusually high catalytic activity for oxidation reactions of RuO2 are traced back to the strong bonding of the reactants over the undercoordinated Ru atoms together with the presence of weakly bound undercoordinated oxygen species, serving as the oxidizing agent.
Free Keywords:Rich Ru(0001) surfaces; Temperature-programmed reduction; Energy-electron-diffraction; Oxygen; Methanol; Adsorption; CO, TiO2(110); Dissociation; SnO2(110)
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Madhavaram H, Idriss H, Centre for Surface and Materials Science, Dept. of Chemistry, The University of Auckland, Auckland, New Zealand; Aßmann J, Löffler E, Muhler M, Lab. of Industrial Chemistry, Ruhr-Universität Bochum, D-44780 Bochum, Germany
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