Abstract
In a quartz vessel at temperatures above 450°C oxygen exchange between CO and O 2 occurs as an independent process parallel to CO 2 production. The chemical kinetics of this exchange have been studied with 18O as a tracer at 500°C. The oxygen exchange reaction is not influenced by the addition of water, whereas the production of CO 2 is considerably reduced. The exchange rate is only slightly enhanced by increasing the surface to volume ratio, indicating a small influence of the surface. At 500°C a rate law S = k· p co n · p o 2 m , with n = 0·68 ± 0·06 and m = 0·58 ± 0·05 has been found. It appeared possible to study the exchange reaction while the simultaneous CO 2 production was relatively small. It is concluded that the oxygen exchange reaction is mainly a gas-phase process whereas the formation of CO 2 occurs as a surface reaction. Exchange mechanisms are discussed.
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