Abstract
The concentration of excess electrons in zinc oxide catalysts was determined by hydrogenevolution method and the effect of doping with mono- and trivalent cations was studied. The amount of excess electrons of doped and nondoped zinc oxides increased remarkably by evacuation above 300 °C. The addition of trivalent cations increased the excess electron concentration, while the monovalent cation seemed to decrease it. Such behavior is consistent with the observation in electron conductivity measurement, and can be interpreted in terms of the substitution of impurity cations for the lattice zinc. It was found, however, that the catalytic activity for the isomerization of butenes over these catalysts is independent of net excess of electrons detected by this method.
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