Travelling fronts of the CO oxidation on Pd(111) with coverage-dependent diffusion

Jaime Cisternas, Stefan Karpitschka, Stefan Wehner

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Abstract

In this work, we study a surface reaction on Pd(111) crystals under ultra-high-vacuum conditions that can be modeled by two coupled reaction-diffusion equations. In the bistable regime, the reaction exhibits travelling fronts that can be observed experimentally using photo electron emission microscopy. The spatial profile of the fronts reveals a coverage-dependent diffusivity for one of the species. We propose a method to solve the nonlinear eigenvalue problem and compute the direction and the speed of the fronts based on a geometrical construction in phase-space. This method successfully captures the dependence of the speed on control parameters and diffusivities.

Translated title of the contributionFrentes móviles de la oxidación del CO en Pd (111) con difusión dependiente de la cobertura
Original languageEnglish
Article number164106
JournalJournal of Chemical Physics
Volume141
Issue number16
DOIs
StatePublished - 28 Oct 2014

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