Abstract
This work analyzes the performance of a composite catalyst pellet under deactivation conditions characteristic of those found in automobile catalysis. The composite pellet is made of two layers, the inner layer supports the active metal in a high area support, whereas the outer layer is made of a different inert support. Analytical solutions relating activity and lifetime are obtained for a first order reaction and pore mouth poisoning. The results indicate that when the effective diffusivity of the outer layer is higher than in the inner support, the activity relative to initial activity can be maintained at a higher level for a longer period of time than when using a single supported catalyst. The results presented in this work indicate a significant potential to develop such catalyst for application in automobile catalysis.
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