Mathematical modeling of the NO+H2/Pt(100) reaction: “Surface explosion,” kinetic oscillations, and chaos
A mathematical model, consisting of six ordinary differential equations and taking into account the lateral interactions in the adlayer, has been developed for simulating the NO+H2/Pt(100)-(1×1) reaction. This model provides a good theoretical description of temperature programmed desorption and tem...
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Veröffentlicht in: | The Journal of chemical physics 1998-03, Vol.108 (9), p.3740-3749 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | A mathematical model, consisting of six ordinary differential equations and taking into account the lateral interactions in the adlayer, has been developed for simulating the NO+H2/Pt(100)-(1×1) reaction. This model provides a good theoretical description of temperature programmed desorption and temperature programmed reaction (TPR) experiments, including the occurrence of a “surface explosion” in TPR studies. In addition, the model is capable of reproducing many kinds of nonlinear behavior observed in the experiments such as kinetic oscillations and the transition to chaos through period-doubling bifurcations followed by a period-3 or period-5 limit cycle. The simulation results suggest that the (1×1)⇔hex surface phase transition of Pt(100) is not essential to describe the kinetic oscillations and chaos in the NO+H2/Pt(100) system. The most important step in the oscillation mechanism is the autocatalytic increase in the number of vacant sites for NO dissociation. |
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ISSN: | 0021-9606 1089-7690 |
DOI: | 10.1063/1.475767 |