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Reaction fronts and pulses in the CO oxidation on Pt: therortical analysis

Authors

  • M. Baer
  • M. Falcke
  • C. Zuelicke
  • H. Engel
  • M. Eiswirth
  • G. Ertl

Journal

  • Surface Science

Citation

  • Surf Sci 269-270 (Pt A): 471-475

Abstract

  • A set of coupled nonlinear reaction-diffusion equations was formulated for the oxidation of CO on low-index plane Pt surfaces and solved for their spatiotemporal behaviour using continuation techniques and the method of global connections. A 2-variable model for Pt(111), consisting of the CO and O coverages as a function of time and space, gave rise to reaction fronts. In order to model the behaviour of Pt(111) or Pt(100) a third equation describing the respective adsorbate-driven phase transition had to be added. The resulting 3-variable system predicts extended regions of excitability, where pulses can be triggered. The front-respectively pulse - velocities as well as the critical radii for nucleation were computed and compared to experimental data where available.


DOI

doi:10.1016/0039-6028(92)91294-L