NiO–ThO2 mixed catalysts in hydrogen peroxide decomposition and influence of ionizing radiation

Abstract Some physico-chemical and catalytic properties of NiO–ThO 2 catalysts containing various amounts of components in the range 0–100 wt% of one component have been studied before and after 1 MGy gamma or 1 and 3 MGy accelerated electron irradiation in air or in water using the hydrogen peroxide decomposition as a test reaction. The γ -irradiation of pure NiO led to significant changes in surface oxidative ability as well as in catalytic activity of the oxide. Dramatic changes in catalytic activity of the NiO (and partially also of the samples containing an excess of NiO) were caused by reduction of the samples with hydrogen.

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