Abstract
A general superposition integral equation based on a suggestion by Eckert [13] has been derived for the local rate of reaction on external catalytic surfaces of arbitrary shape. Proof of the validity of the equation is given for different kinetic systems and flow regimes. Results agree with previous work of Acrivos and Chambré[3] and Rosner[4]. Effectiveness due to the form of blunt catalytic surfaces can be inferred from wedge solutions. For porous catalysts both contributions of boundary layer and pore diffusion is taken into account by the introduction of an over-all effectiveness factor η o,a. This is a function of the local Thiele modulus and Damköhler number and characterizes the alteration of reaction rate as referred to the reactant concentration in an undisturbed stream.
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