Collect. Czech. Chem. Commun. 1986, 51, 54-65

The course of consecutive reactions inside a nonisotropic catalyst particle, affected by internal difusion

Jiří Hanyka and Alena Fialová

Department of Organic Technology, Prague Institute of Chemical Technology, 166 28 Prague 6


A system of differential equations for consecutive reactions inside a nonisotropic catalyst particle under conditions of internal diffusion is solved. The system of diffusion equations for the spherical geometry of the catalyst grain is numerically solved by using the collocation method. The solution is sought for various radial activity profiles across the catalyst particle and for various values of Thiele's modulus for the two consecutive reactions. The effect of the reaction orders with respect to the reactants on the degree of utilization of the internal catalyst surface and on the reaction selectivity is examined.