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- W2052095205 abstract "The catalytic oxidation of CO with 18O2 has been carried out on MoO3 at 753 K. The isotopic composition of the product CO2 was examined as a function of time. The amount of C 18O2 was always negligible. The percentage of C 18O 16O increased rapidly at the beginning of the reaction then gradually reached a plateau value. Interruption of the oxidation did not significantly affect the percentage of C 18O 16O in the CO2 produced. Oxygen vacancies produced by the reduction of MoO3 with CO apparently remained unchanged on the surface after evacuation for 120 min at 718 K. The incorporation of O2 into oxygen vacancies took place rapidly. A small fraction of 18O atoms taken up into oxygen vacancies were recovered in subsequent CO reduction processes, while the greater part of the 18O diffused into the bulk of the MoO3. The catalytic oxidation of CO with 18O2 on MoO3 could be explained in terms of mobile and immobile sites with regard to 18O atoms taken up into vacancies of active oxygen. This model enables calculation of the time dependence of the yield of C 18O 16O in the product CO2 and estimation of the number of immobile sites." @default.
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- W2052095205 date "1994-01-01" @default.
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- W2052095205 title "18O tracer studies of CO oxidation with O2on MoO3. Part 1.—Diffusion of18O atoms from active sites during the catalysis and the determination of the number of active sites" @default.
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- W2052095205 doi "https://doi.org/10.1039/ft9949001301" @default.
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