Simulataneous heat and mass transfer with and without reactant exhaustion in catalyst particles for reaction with volume change

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Abstract
Asymptotic analytic expressions for the concentration and temperature profiles as well as effectiveness factor inside porous, thin‐disk shaped catalyst particles have been developed for zeroth‐order exothermic reaction with reactant‐to‐product volume change. The individual and combinative effects of volume‐change, Thiele and thermal Thiele moduli, and of the dimensionless activation energy are discussed. As expected, the expressions revert to those for the corresponding isothermal and constant‐volume cases. Errors arising from the approximation were calculated and found to be quite acceptable.