Investigation of Chemisorption by Desorption Rate Measurement; CO<SUB>2</SUB> on ZnO and NiO; CO on NiO

概要

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As an extension of previous work, the study of chemisorption by desorption rate measurement was carried out for carbon dioxide adsorbed on zinc oxide and nickel oxide, and also for carbon monoxide adsorbed on nickel oxide. For the chemisorption of carbon dioxide, the activation energy of the desorption was increased with the decreasing amount adsorbed from 16 to 40 kcal./mol. on zinc oxide and from 7 to 30 kcal./mol. on nickel oxide. In the case of the chemisorption of carbon monoxide, where the two types of chemisorption are seemingly operating, the activation energy of the desorption for the reversible type ranged from 5 to 18 kcal./mol. A method of distinguishing these two types of chemisorption from the behavior on desorption has been proposed, for it has been found that there are two types of chemisorption for the carbon dioxide-zinc oxide system. From the effect of oxygen treatment at high temperatures on the chemisorption, it was concluded that the effect of the surface barrier, emphasized by Hauffe and others, seems to be only of secondary importance in the above system.
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