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.
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