Abstract
The effect of oxygen treatment at about 500°C of zinc oxide upon the chemisorption of hydrogen as well as of carbon monoxide was investigated in order to clarify the relation between the electronic state of the adsorbent and the chemisorption. In the case of hydrogen chemisorption, the amount adsorbed was reduced only slightly and the rate of desorption remained practically unaltered after oxygen treatment. On carbon monoxide chemisorption the oxygen treatment gave no effect. It was concluded from these results that both the chemisorption of hydrogen and that of carbon monoxide are essentially independent of the electronic state of zinc oxide. On the basis of such a conclusion combined with other results, the inapplicability of the model of hydrogen chemisorption proposed by Morrison was pointed out.

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