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

TY - JOUR

T1 - Stationary fronts due to weak thermal effects in models of catalytic oxidation

AU - Sheintuch, Moshe

AU - Nekhamkina, Olga

N1 - Funding Information: This work is supported by the Israel Science Foundation and the Technion’s Fund for the Promotion of Research. One of the authors (M.S.) is a member of the Minerva Center of Nonlinear Dynamics. Another author (O.N.) is partially supported by the Center for Absorption in Science, Ministry of Immigrant Absorption State of Israel.

PY - 2005/8/8

Y1 - 2005/8/8

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=24144456585&partnerID=8YFLogxK

U2 - 10.1063/1.2000232

DO - 10.1063/1.2000232

M3 - 文章

AN - SCOPUS:24144456585

SN - 0021-9606

VL - 123

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

IS - 6

M1 - 064708

ER -