Coking Inside a Catalyst Particle

In the preceding sections, (S.3.b,c) no attention was given to situations where the reaction components encounter important transport resistances inside the catalyst particle. In Qiapter 3 it was shown how concentration gradients then build up in the particle, even when the latter is isothermal. In the steady state a feed component A then has a descending concentration profile from the surface towards the center 

Masamune and Smith [25] applied the approach used by Froment and BischofT [12] to the situation discussed here. If the rate of coke formation is small compared to the rate of the main reaction, a pseudo steady state may be assumed and the following continuity equations for A and the coke may be written, provided the reaction is irreversible and of the first order and the particle is isothermal  

Example S3J.-I Coking in the Dehydrogenation of UButene into Butadiene on a C oma-Abumna Catalyst 

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