Abstract
Abstract By the use of highly concentrated 18O-carbon dioxide, both the rate of the isotopic exchange of CO2 and the surface oxygen of a powderd V2O5 catalyst and that of the isotopic equilibration of CO2 on the surface were determined simultaneously in the temperature range from 330 to 450 °C. The rate of the isotopic exchange on the thin-plate crystallines, in which the (010) plane of V2O5 crystal was mainly exposed, was also determined. The equilibration rate was 30–40 times faster than the exchange rate. The exchange process on the thin-plate crystallines was found to be extremely rapid, although such a phenomenon has never been found on the powdered catalyst. Based on these results, the relationship of the reaction steps of the isotopic exchange and the isotopic equilibration with those on the triangular scheme of CO-oxidation, previously proposed, was discussed in detail. A small cycle of alternate reduction-oxidation on the top of the surface, especially on the (010) plane, was conclusively confirmed.
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