Abstract

An industrial FCC catalyst has been exposed in a MAT reactor to typical heavy fractions to obtain samples with different coke contents. These samples were investigated in the TAP reactor with toluene as probe molecule. A mathematical model has been developed that allows estimating diffusion coefficients in the meso- and micropores as well as the sorption parameters. Modeling of the TAP data provides insight into the deactivation mechanism due to coke deposition. At low coke content ( < 2.6 wt % ) , the enthalpy for toluene adsorption drops rapidly with increasing coke content indicating preferential blocking of the strongest acid sites. At higher coke contents ( > 2.6 wt % ) , blocking of the micropores occurs. The model describes the data adequately with physical meaningful parameters.

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