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



  history
ID: 9912.0, Fritz-Haber-Institut / Physical Chemistry
The kinetics of CO oxidation on RuO2(110): Bridging the pressure gap
Authors:Wang, Jinhai; Fan, Chaoyang; Jacobi, Karl; Ertl, Gerhard
Language:English
Date of Publication (YYYY-MM-DD):2002-04-04
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem. B
Volume:106
Issue / Number:13
Start Page:3422
End Page:3427
Copyright:© American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The steady-state rate r(CO2) of CO2 formation from CO + O-2 on an epitaxially grown RuO2(110) single-crystal surface was recorded as a function of the partial pressures in the 10(-7)-10(-6) mbar range. The RuO2(110) surface exposes singly coordinatively unsaturated "Ru-cus" sites and 2-fold coordinatively unsaturated "Ru-bridge" sites. Normally, the Ru-bridge sites are saturated by oxygen (O-bridge) which can be replaced by CO. The stage of the surface was controlled by vibrational spectroscopy (HREELS), and analysis of the kinetic data was based on previous information about the structural and adsorptive properties of this surface. Measurements of the rate as a function of temperature up to approximate to350 K in a 1:1 mixture of CO and O-2, each with 10(-7) mbar partial pressure, revealed most remarkable agreement with data reported by Zang and Kisch(13) with small supported RuO2 particles prepared from aqueous solution for 1 bar total pressure. Under these conditions of temperature and ratio of partial pressures the reaction will essentially proceed between CO and O species adsorbed at Ru-cus. The total pressure becomes largely insignificant: whereas the pressure changes by 10 orders of magnitude, r(CO2) is estimated to vary only within 1 order of magnitude se that the pressure gap is bridged here.
Free Keywords:KeyWords Plus:
AMMONIA-SYNTHESIS; CARBON-MONOXIDE; CATALYSTS; RU(0001)
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
Identifiers:DOI:10.1021/jp014109k
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