New Models of Catalyst Deactivation by Coke:
II. Coking of Supported Platinum Catalysts

N. M. Ostrovskii

Boreskov Institute of Catalysis (Omsk Branch), Siberian Division, Russian Academy of Sciences, Omsk, Russia

Received September 18, 2000

Abstract—Metal and support deactivation upon the coking of supported metal catalysts occurs via different
mechanisms. Several models of coking are presented. The most complete complex model is developed for sup-
ported platinum catalysts. It implies multilayer coke formation on support, the rapid formation of polymeric
coke capable of self-regeneration by hydrogen directly in the course of reaction on platinum, and the slow con-
version of this coke into graphite-like coke, which is removed only by oxidative regeneration. The models are
experimentally supported for cyclohexane dehydrogenation.

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