Kinetic Models of Catalyst Deactivation
in Paraffin Dehydrogenation

N. A. Gaidai and S. L. Kiperman^†

Zelinskii Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, 119991 Russia

Received May 12, 1999

Abstract—The results of studying the deactivation of both unpromoted platinum–alumina catalysts and those
promoted with K, Li, In, Sn, and W in the dehydrogenation of lower and higher paraffins are discussed. The
main reason for catalyst deactivation is found to be coke formation. The rate laws of coke formation and paraffin
dehydrogenation in the non-steady-state regime of the reaction are derived. The catalyst sulfuring is found to
enhance its stability. The effects of oxygen and water impurities on the reactions and coke formation are studied.

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