DEACTIVATION BY COKE OF A CR2O3/AL2O3 CATALYST DURING BUTENE DEHYDROGENATION

The coking data obtained during the dehydragenation of n-butene on a Cr2O3/Al2O3 catalyst have been successfully fitted using a model which considers simultaneously coke depositian directly on the surface (monolayer coke) and on multiple layers. The variation of the monolayer and multiple-layer coking rates with time, temperature, and hydrogen partial pressure have been investigated. The results obtained in this work show that the relevant deactivation variable far this system is the amount of monolayer coke, rather than the total coke content of the catalyst. © 1993 Academic Press, Inc.