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Visualization of atomic processes on ruthenium dioxide using scanning tunneling microscopy

Over, H; Knapp, M; Lundgren, Edvin LU ; Seitsonen, AP; Schmid, M and Varga, P (2004) In ChemPhysChem 5(2). p.167-174
Abstract
The visualization of surface reactions on the atomic scale provides direct insight into the microscopic reaction steps taking place in a catalytic reaction at a (model) catalyst's surface. Employing the technique of scanning tunneling microscopy (STM), we investigated the CO oxidation reaction over the RuO2(110) and RuO2(100) surfaces. For both surfaces the protruding bridging O atoms are imaged in STM as bright features. The reaction mechanism is identical on both orientations of RuO2. CO molecules adsorb on the undercoordinated surface Ru atoms from where they recombine with undercoordinated O atoms to form CO2 at the oxide surface. In contrast to the RuO2(110) surface, the RuO2(100) surface stabilizes also a catalytically inactive c(2 x... (More)
The visualization of surface reactions on the atomic scale provides direct insight into the microscopic reaction steps taking place in a catalytic reaction at a (model) catalyst's surface. Employing the technique of scanning tunneling microscopy (STM), we investigated the CO oxidation reaction over the RuO2(110) and RuO2(100) surfaces. For both surfaces the protruding bridging O atoms are imaged in STM as bright features. The reaction mechanism is identical on both orientations of RuO2. CO molecules adsorb on the undercoordinated surface Ru atoms from where they recombine with undercoordinated O atoms to form CO2 at the oxide surface. In contrast to the RuO2(110) surface, the RuO2(100) surface stabilizes also a catalytically inactive c(2 x 2) phase may play an important role in the deactivation of RuO2 catalysts in the electrochemical Cl-2 evolution and other heterogeneous reactions. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
surface chemistry, microscopy, scanning probe, ruthenium dioxide, catalytic activity, oxide surfaces
in
ChemPhysChem
volume
5
issue
2
pages
167 - 174
publisher
John Wiley & Sons
external identifiers
  • pmid:15038276
  • wos:000220019100001
  • scopus:2442564479
ISSN
1439-7641
DOI
10.1002/cphc.200300833
language
English
LU publication?
yes
id
a4a5caa1-5d95-4ae5-9cda-5673ed755235 (old id 286173)
date added to LUP
2007-10-26 14:47:55
date last changed
2017-09-24 03:42:28
@article{a4a5caa1-5d95-4ae5-9cda-5673ed755235,
  abstract     = {The visualization of surface reactions on the atomic scale provides direct insight into the microscopic reaction steps taking place in a catalytic reaction at a (model) catalyst's surface. Employing the technique of scanning tunneling microscopy (STM), we investigated the CO oxidation reaction over the RuO2(110) and RuO2(100) surfaces. For both surfaces the protruding bridging O atoms are imaged in STM as bright features. The reaction mechanism is identical on both orientations of RuO2. CO molecules adsorb on the undercoordinated surface Ru atoms from where they recombine with undercoordinated O atoms to form CO2 at the oxide surface. In contrast to the RuO2(110) surface, the RuO2(100) surface stabilizes also a catalytically inactive c(2 x 2) phase may play an important role in the deactivation of RuO2 catalysts in the electrochemical Cl-2 evolution and other heterogeneous reactions.},
  author       = {Over, H and Knapp, M and Lundgren, Edvin and Seitsonen, AP and Schmid, M and Varga, P},
  issn         = {1439-7641},
  keyword      = {surface chemistry,microscopy,scanning probe,ruthenium dioxide,catalytic activity,oxide surfaces},
  language     = {eng},
  number       = {2},
  pages        = {167--174},
  publisher    = {John Wiley & Sons},
  series       = {ChemPhysChem},
  title        = {Visualization of atomic processes on ruthenium dioxide using scanning tunneling microscopy},
  url          = {http://dx.doi.org/10.1002/cphc.200300833},
  volume       = {5},
  year         = {2004},
}