Abstract
Reduction of mixed oxides NiO-MoO3 of varying composition by hydrogen in the temperature range 653-773 K was studied as well as several physico-chemical parameters of the reduction products - methanation catalysts.Initial oxides contain - depending on their composition - a varying concentration of nickel molybdate as a free phase. The reduction of molybdenum oxide is catalytically influenced by nickel reduced and takes place, depending on its actual concentration, to the lower oxidation degrees eventually to the metallic molybdenum. On the other hand, the molybdenum present stabilizes nickel microcrystallites during the reduction by hydrogen. Resulting active catalytic systems exhibit a high specific surface. The rate, degree, and apparent activation energy of the reduction are markedly dependent on the initial sample composition. The reduction kinetics can be qualitatively described by an equation of the zone model of solid phase decomposition.
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