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Journal of Chemical Physics / Volume 130 / Issue 12 / ARTICLES / Surfaces, Interfaces, and Materials

J. Chem. Phys. 130, 124704 (2009); http://dx.doi.org/10.1063/1.3096989 (7 pages)

External noise-induced phenomena in CO oxidation on single crystal surfaces

M. Pineda and R. Toral

IFISC Instituto de Física Interdisciplinar y Sistemas Complejos (CSIC-UIB), E-07122 Palma de Mallorca, Spain

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(Received 26 November 2008; accepted 10 February 2009; published online 24 March 2009)

The influence of external noise on minimalistic models for the catalytic CO oxidation on Ir(111) and Pt(111) is studied by means of the adiabatic elimination technique. Two models, which reproduce the bistable behavior usually observed in CO oxidation on Pt group metal surfaces, are analyzed. The noise is superposed on the fraction of CO in the constant gas flow directed at the surfaces and the resulting stochastic systems are reduced after the adiabatic elimination of oxygen coverage. This reduction allows us to analyze theoretically the interplay between external noise and the kinetic bistability of CO oxidation. We report the phenomena of noise-induced shifts of steady states and noise-induced jumps between stable steady states. We also present evidence for noise-induced transitions from mono- to bistability. The theoretical results are compared with simulations of the original two-variable stochastic reaction systems.

© 2009 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. CO OXIDATION ON (111) SURFACES
    1. Kinetic bistability
    2. Time scale separation and adiabatic reduction
  3. EXTERNAL NOISE ON CO OXIDATION ON (111) SURFACES
    1. Adiabatic reduction from the stochastic approach
    2. Application to CO oxidation on Ir(111)
      1. Noise-induced shift of steady states
      2. Evidence for noise-induced transition from mono- to bistability
    3. Application to CO oxidation on Pt(111)
      1. Noise-induced shift of steady states
      2. Evidence for noise-induced transition from mono- to bistability
  4. SUMMARY AND CONCLUSIONS

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KEYWORDS and PACS

Keywords

carbon compounds, catalysis, iridium, oxidation, platinum, reaction kinetics theory, reduction (chemical), stochastic systems, surface chemistry

PACS

  • 81.65.Mq

    Oxidation

  • 82.65.+r

    Surface and interface chemistry; heterogeneous catalysis at surfaces

  • 82.20.-w

    Chemical kinetics and dynamics

  • 82.30.-b

    Specific chemical reactions; reaction mechanisms

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3096989

PUBLICATION DATA

ISSN

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

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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