Abstract
A comparison is given between the rate of catalytic reactions and that of decomposition of surface compounds under the influence of molecular oxygen of different isotopic composition in reactions of complete oxidation of n-butane and 1-hexene on zinc oxide and cuprous oxide. It has been shown that the rates of accumulation of products containing heavy oxygen are much smaller than those theoretically expected from the heavy isotope concentration in molecular oxygen. A conclusion is drawn that molecular oxygen is not directly incorporated into the reaction products but promotes decomposition of the surface compounds by oxidizing the surface sites where these compounds are stabilized.
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