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Nonlinear Effects In Adsorption And Reaction Dynamics At Surfaces: Kinetic Oscillations Under Scrutiny

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  • DAVID A. KING

    (Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK)

Abstract

A number of catalytic reactions exhibit complex dynamical behavior, including kinetic oscillations with both temporal and spatial characteristics. Attention has been focused on theCO+ NOandCO+O2reactions on Pt{100}. Recent molecular beam studies conducted at Cambridge on the interaction of CO with Pt{100} have provided the basis for a new mechanism for oscillatory behavior. The rate of growth of(1×1)islands on the quasihexagonal reconstructed phase of Pt{100} isstrongly nonlinearwith respect to the local CO coverage on the hex-R phase at temperatures between 380 and 410 K, with a reaction order of 4. This strong nonlinearity results in a flux-dependent sticking probability for CO at this temperature, and detailed modeling also reproduces the major features in the oscillatory behavior observed for theCO+NOreaction. An important effect of the nonlinearity in both theCO+NOandCO+O2oscillatory behavior at high temperatures is the maintenance of in-phase behavior across the surface during oscillations.

Suggested Citation

  • David A. King, 1994. "Nonlinear Effects In Adsorption And Reaction Dynamics At Surfaces: Kinetic Oscillations Under Scrutiny," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 1(04), pages 435-442.
    • Handle: RePEc:wsi:srlxxx:v:01:y:1994:i:04:n:s0218625x94000400
    DOI: 10.1142/S0218625X94000400
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