Abstract
The kinetics of the exchange of gas-phase oxygen-18 with the oxygen of copper(II) molybdate has been studied in an all-glass "static-circulation" apparatus using a quartz differential reactor. The activation energy of the exchange between 522 and 601 °C was 40 kcal mol−1 and the reaction order was 0.7 in the oxygen partial pressure range 5 to 30 Torr. The structure and physical properties of the molybdate were determined by X-ray, i.r., thermal and chemical analysis.It is shown that the exchange reactivity of the surface and bulk oxygen in copper(II) molybdate is closer to the reactivity of oxygen in MoO3 than it is to the oxygen in CuO. From current theories on the relationships between exchange rates and catalytic properties, it is deduced that copper(II) molybdate would be expected to exhibit properties similar to those of V2O5 in catalytic oxidation reactions.
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