ESR Study of Radical Generation
in the Course of Catalytic Pyrolysis of Hydrocarbons

N. A. Vasil’eva, V. K. Ermolaev, and S. Yu. Kuz’mitskaya

Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 Russia

Received April 24, 1996

Abstract—The possibility of alkyl radical generation on the heterogeneous catalysts for hydrocarbon pyrolysis
is studied using radical freezing in the resonator of an ESR spectrometer. The pyrolysis of n-butane and n-unde-
cane on the magnesium oxide samples with a defect structure is investigated. The higher the catalyst activity
during pyrolysis, the higher its ability to generate additional ethyl radicals into the gas phase. The results pro-
vide the experimental evidence for the concept of the catalysis sphere based on the radical–chain theory of the
heterogeneous–homogeneous reactions of the catalytic pyrolysis of hydrocarbons.

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