Prediction of Relative Poison Sensitivities of Conventional and Filleted Monolithic Automotive Catalysts

A model for conversion from partially poisoned monoliths has been developed. The model includes a variation of washcoat thickness in the corners. Calculations predict that the use of fillets to obtain more uniform washcoats is advantageous for fresh catalyst activity at high catalytic rate constants. Conventional non-uniform washcoat distributions show improved durability, especially for lower rate constants.