2002•Acta Petrolei Sinica(Petroleum Processing Section)Requires access
NETWORK MODEL FOR CATALYST DEACTIVATION DUE TO COKING
Shaofen Li
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Abstract
A model for catalyst deactivation due to coking was presented based on the spherical random three-dimensional network. The mechanism of catalyst deactivation in different conditions was analyzed by using this model. The variations of intrinsic reaction rate constant and the effective diffusivity with different coke levels were obtained. The simulation results showed that under the same coke level, the activity of the coked catalyst depended on the location of the coked sites and the relative coke growth rate. When the coked sites mainly located near the outer surface of the catalyst, and the relative coke growth rate was low, the catalyst showed a relative lower activity. Experimental results on cumene cracking reaction were analyzed and interpreted by this model.