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Time evolution of the catalytic oxidation of carbon monoxide on a disordered substratum

E V Albano

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The time evolution of the reactant concentrations, the rate of production and the concentration of vacancies around islands of the minority species, in a model for the catalytic oxidation of carbon monoxide, is studied on percolation clusters by means of Monte Carlo simulations and scaling arguments. The model exhibits two kinetic transitions and the relevant exponents for the time evolution of the above-mentioned quantities are evaluated at criticality. The influence of the fractal substratum on the behaviour of the reaction is discussed and compared with reported results for homogeneous media.


PACS

82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces

64.60.A- Specific approaches applied to studies of phase transitions

MSC

82B26 Phase transitions (general)

82B43 Percolation (See also 60K35)

82B80 Numerical methods (Monte Carlo, series resummation, etc.) (See also 65-XX, 81T80)

Subjects

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Chemical physics and physical chemistry

Dates

Issue 11 (7 June 1990)



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