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Journal Article

Formation of Turing structures in catalytic surface reactions: The facetting of Pt(110) in CO+O2

MPS-Authors
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Imbihl,  Ronald
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Falta,  J.
Institut fur Festkörperphysik der Universität Hannover;
Fritz Haber Institute, Max Planck Society;

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Kaletta,  D.
Fritz Haber Institute, Max Planck Society;
Zentrum für Datenverarbeitung der Universität Tübingen;

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Henzler,  M.
Institut fur Festkörperphysik der Universität Hannover;
Fritz Haber Institute, Max Planck Society;

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1.577455.pdf
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Citation

Imbihl, R., Falta, J., Kaletta, D., & Henzler, M. (1991). Formation of Turing structures in catalytic surface reactions: The facetting of Pt(110) in CO+O2. Journal of Vacuum Science and Technology A, 9(3), 1749-1752. doi:/10.1116/1.577455.


Cite as: https://hdl.handle.net/21.11116/0000-000A-52F9-1
Abstract
The Pt(110) surface facets during the catalytic oxidation of CO, if reaction conditions are adjusted such that the CO‐induced 1×1⇄1×2 phase transition can take place simultaneously. A detailed low‐energy electron diffraction beam profile analysis revealed that regularly spaced (430) and (340) facets are formed with a lateral periodicity of ∼70 lattice units along the [11̄0] direction. This result, together with the observation that the facetted surface is only stable under reaction conditions, indicates a dissipative structure of the Turing type. Such structures, which are stationary but exhibit a periodic variation of the concentration variables in space, have so far almost exclusively been discussed theoretically. The interpretation of the facetted surface as a Turing structure could be confirmed by a Monte Carlo simulation based on the Langmuir Hinshelwood mechanism of catalytic CO oxidation and the CO‐induced 1×1⇄1×2 phase transition.