CATALYTIC PROPERTIES OF NICKEL-COBALT MIXED OXIDES AND THE INFLUENCE OF IONIZING-RADIATION

The catalytic and some physico-chemical properties of NiO-Co3O4 and NiO-CoO catalysts have been tested before and after irradiation, using the decomposition of hydrogen peroxide as a test reaction on storage of the NiO-Co3O4 system changes in the oxidative abilities as well as in the specific catalytic activities were observed and found to be qualitatively similar. Both these quantities depend non-monotonically on the composition of the NiO-Co3O4 catalysts and they seemed to be notably affected by ionizing radiation. The stationary specific catalytic activity of the NiO-CoO system depended linearly on its surface oxidation ability; this system seems to be insensitive to irradiation and showed a higher general stability. The possible character of the catalytic sites in these catalysts are discussed.