Abstract
Oxygen isotope exchange between C 18O2 and MoO3 has been examined in connection with the catalytic oxidation of C 16O with 18O2 on MoO3. Oxide ions at mobile and immobile sites on MoO3, which oxidize CO in the catalytic oxidation, were found to work also as active sites in the oxygen isotope exchange between C 18O2 and Mo 16O3. The observed time dependences of the yields of C 18O2, C 18O 16O and C 16O2 in the exchange agreed satisfactorily with those calculated from the mobile and immobile site model. In the calculation, the number of immobile sites was estimated to be 1.8% of the total surface lattice oxide ions. The exchange rate at immobile sites was 13% of the total exchange rate.
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