SYNERGETIC EFFECT OF OXIDE CATALYSTS WITH DIFFERENT DOPENTS ON CATALYTIC ACTIVITY .I. NICKEL OXIDE AND ZINC OXIDE FOR CARBON MONOXIDE OXIDATION

The catalytic activity of pure, doped nickel oxide, and mixtures of nickel oxides with different dopents was investigated by the reaction of carbon monoxide oxidation. The incorporation of lithium ions in the oxide enhanced the activity and the addition of indium lowered the activity. The activity of mixtures increased to several times greater than would be predicted by simple additive effect of single doped catalysts. For zinc oxide, the incorporation of lithium or indium ions, respectively, decreased or increased the activity. Mixtures of zinc, oxides with different dopents were also more active than expected from the simple additive effect. The mechanism of the enhanced activity of mixtures was discussed from the viewpoint of synergetic action of doped catalysts with different Fermi levels. © 1969.