Reaction and Mass Transfer in Porous Catalyst Structures

Reaction and Mass Transfer in Porous Catalyst Structures 

Reaction, diffusion, and catalyst deactivation in a porous catalyst layer are considered. A general model for mass transfer and reaction in a porous particle with an arbitrary geometry can be written as follows  

The component generation rate (q) is calculated from the reaction stoichiometry. 

For the catalyst activity factor (aj), several models have been proposed, depending on the origin of catalyst deactivation, that is, sintering, fouling, or poisoning. The following differential equation can semiempiricaUy represent different kinds of 

Some special cases of Equation (8.4) are of interest for irreversible first (n = 1) and second (n = 2) order deactivation kinetics we get aj = aoje i and aj = Ooj/ + UojkjJ, respectively. 

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