The effect of intraparticle diffusion on the deactivation rates of isothermal

spherical catalyst pellets for uniform independent deactivation was studied by means of the method of orthogonal collocation. A quantitative relationship between the deactivation effectiveness factor and Thiele modulus was developed for the second order reaction and the mth order deactivation. The extension to the nth order reaction and the mth order deactivation was also discussed. A combined unit of micro-reactor and gas chromatography was used to study the deactivation of catalyst for the disproportionation of toluene over mordenite catalyst. Various diffusion-deactivation kinetic equations were tested and their goodness of fit was discussed. In particular

it was found that the second order reaction and the mth order deactivation rate form agreed with the data.