Effect of Shell-Progressive Poisoning on the

4 Effect of Shell-Progressive Poisoning on the Selectivity of Simultaneous Reactions 

Sada and Wen [1967] extended these catalyst poisoning models to sets of simultaneous reactions. The poison deposition was described as in (5.2.3-7), but for very rapid poisoning, Da x . The results were expressed in terms of the dimensionless position of the poison boundary, = tc I R. The profiles are described by 

The three basic selectivity problems were solved for various cases of one or both reactions poisoned. Only a brief selection of results will be presented here. 

The model equations for diffusion and reaction are In the poisoned shell  

Dsb C bs = KPs bs (when reaction 2 is not poisoned) = 0 (when reaction 2 is poisoned) 

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