Dynamics of Isotopic Label Transfer
in Catalytic Reactions

E. M. Sadovskaya, D. A. Bulushev, and B. S. Bal’zhinimaev

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

Received June 23, 1997

Abstract—Dynamics of isotopic label transfer in open catalytic systems is studied in the general form. The
advantages and limitations of steady-state isotopic transient kinetic analysis are compared to those of the kinetic
relaxation method. The applicability of the isotopic relaxation method to the discrimination of the reaction
mechanisms is discussed. This method can also be applied to the determination of the composition of adsorp-
tion layer and kinetic parameters taking into account gas dynamics in a catalytic reactor. The mechanism of iso-
topic label transfer in ethylene epoxidation over silver catalyst is elucidated. The surface coverages by various
forms of adsorbed oxygen and the values of rate constants of the steps of ethylene oxide and carbon dioxide
formation are estimated.

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