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Lateral interactions of CO in the (2×1)p2mg structure on Pd(110): Force constants between tilted CO molecules
Intermolecular interactions between tilted CO molecules in the (2×1)p2mg structure on Pd(110) were studied by means of high-resolution electron energy-loss spectroscopy (HREELS). We measured the...
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The bonding of CO to metal surfaces
The atom and symmetry specific properties of x-ray emission spectroscopy have been applied to the investigation of CO adsorbed on Ni(100) and Cu(100) surfaces. In comparison to ab initio electronic st...

Reaction of gaseous oxygen with adsorbed carbon on Pt{110}(1×2)

J. Chem. Phys. 112, 1937 (2000); doi:10.1063/1.480822

Issue Date: 22 January 2000

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A. V. Walker and D. A. King
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW
The C oxidation reaction on Pt{110}(1×2) has been investigated using molecular beam techniques. The reaction products are CO and CO2. As the surface temperature is increased from 550 to 750 K, the proportion of CO2 produced decreases from ~50% to <1%. When oxygen first impinges on the surface, the formation rate of CO is observed to rise immediately (<=0.1 s), and then rise more slowly to a maximum before decreasing sharply as the C adlayer is depleted. The production of CO2 is initiated after a measurable delay. Angle-resolved product distribution measurements demonstrate that CO desorbs in a sharp lobe centered at an angle of 32° to the surface normal, fitted to cosn(theta–32), where n = 50±5. The C oxidation reaction site is identified with the (111) microfacets. It is concluded that two processes are operative, a Langmuir–Hinshelwood mechanism and a reaction in which CO is impulsively desorbed. ©2000 American Institute of Physics.
History: Received 5 August 1999; accepted 28 October 1999
Permalink: http://link.aip.org/link/?JCPSA6/112/1937/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.65.Jv
    Physical chemistry Surface and interface chemistry Heterogeneous catalysis at surfaces
  • 68.45.Da
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solid–fluid interfaces Adsorption and desorption kinetics; evaporation and condensation
  • 82.65.My
    Physical chemistry Surface and interface chemistry Chemisorption
  • 82.30.Cf
    Physical chemistry Specific chemical reactions; reaction mechanisms Atom and radical reactions; chain reactions
  • 82.20.Hf
    Physical chemistry Chemical kinetics Mechanisms and product distribution
  • YEAR: 2000

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ISSN:
0021-9606 (print)   1089-7690 (online)
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