Instantaneous kinetic constants and gasoline selectivities have been determined for catalytic cracking of n‐hexadecane. The pulse technique was used in order to model the sequential build‐up of coke which occurs on cracking catalyst within a riser transport‐line reactor. The total amount of hydrocarbon injected per unit weight of catalyst was between 0 and 10. The mathematical model used to analyze the data was based on the unsteady state mass balance of the microcatalytic reactor with the assumption of plug flow. Results suggest a fast deactivation process during the run with fresh catalyst, while regenerated catalyst showed a slower deactivation. The catalyst regenerated three times evidenced a low apparent activation energy when temperature was increased from 500°C to 550°C.
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