Stationary fronts due to weak thermal effects in models of catalytic oxidation

Moshe Sheintuch, Olga Nekhamkina*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We analyze the possible existence of an infinite number of stationary front solutions in a microkinetic model of a catalytic reaction coupled with weak enthalpy effects in the domain of kinetics bistability. The kinetic model incorporates three steps: dissociative oxygen adsorption, reactant adsorption and desorption, and surface reaction. The infinitude of stationary front solutions emerges due to the lack of intercrystallites communication of surface species in supported catalysts; thermal conductions and gas-phase diffusion are the only means of interaction. Incorporation of surface species diffusion leads to a very slow front motion. We complement this analysis with simulations of stationary states on one- (wire and ring) and two-dimensional (disk) systems which may be subject to control or to fluid flow. These results account for certain experimental results and may have implications for various technological problems.

Original languageEnglish
Article number064708
JournalJournal of Chemical Physics
Issue number6
StatePublished - 8 Aug 2005
Externally publishedYes


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