Abstract
A mathematical model, which includes the transfer of reactants in the bulk phases, the diffusion of reactants through pores of the catalyst particle, and the intrinsic reactions of the reactants, was used to describe the dynamics of a triphase catalysis. A solution of the dynamic behavior was obtained by the finite difference method. In order to understand the effect of the mass-transfer resistance on the observed reaction rate, an internal effectiveness factor was considered. The calculated internal effectiveness factor was compared with that of the conventional one for heterogeneous catalysis. The calculated apparent reaction rate constant, which depends on the diffusivities of the reactants and the intrinsic reaction rate constants, is very consistent with that of the experimental results
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