Abstract
Abstract The nature of the active sites of nickel oxide has been studied by changing surface properties by means of γ-irradiation technique. Using powdered nickel oxide catalyst, catalytic activities, surface excess oxygen contents, electrical conductivity changes during thermal desorption of gases, and reactivities of the sample with CO2, CO and H2 were compared as a function of γ-ray dose of preirradiation. It has been found that the catalytic activity, the excess oxygen content and the conductivity change with the increase in the irradiation dose, and the change is remarkable when a total dose is greater than 1×108R. The catalytic activity for the decomposition of H2O2 was observed to increase, while that for the decomposition of i-C3H7OH vapor was observed to decrease with the irradiation dose. Measurements on the desorption of excess oxygen and the adsorption of CO2 simultaneously with electrical conductivity have indicated that the adsorbed state of surface oxygen may be changed into a strong form by the irradiation, as O−(ad) \ightsquigarrow O2−(ad). Discussions have been made on the correlation between the catalytic sites and surface properties of the irradiated nickel oxide.
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