Abstract
Some physical and catalytic properties of the two-component nickel oxide-ferric oxide catalysts were studied using samples with different content of both components, covering the whole concentration range from 0 to 100% of one of the components. It was proved that these properties depend strongly on the preparation procedure of the catalyst of the desired composition and on the catalyst composition for the given preparation procedure; moreover, it was proved that the phase composition of the contact catalyst is not decisive for the catalytic activity of the given system. It seems probable that the valence state of the catalyst metal ions and their ability to form the reaction catalytic centers are the rate-determining factors. The results obtained lead at the same time to the assumption that these parameters change substantially with the catalyst composition. No changes of the catalytic activity were observed for catalysts irradiated by fast neutrons or accelerated electrons.
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