Effect of Additives on the Hydrogen Reduction of Nickel Oxide

Abstract

Abstract The effect of additive impurities on the hydrogen reduction of nickel oxide has been studied. The additives have no influence on the reduction unless they dissolve into nickel oxide crystal. The reduction is promoted by the dissolution of cupric oxide and is retarded by the dissolution of lithium oxide and aluminum oxide. The effect of additives on the reduction is not explained reasonably by their catalytic behavior. There is no direct correlation between the reductive properties of nickel oxide and the type of additives from the point of the semiconducting behavior of these materials. The effect of additives on the reduction is related to their heats of formation.