Gaseous oxidation phenomena show a great variety, since actions may take place both on the vessel wall and homogeneously, and reaction chains which may thus be set up are broken either in the gas phase or at the wall according to circumstances. With the object of extending the picture of these reactions, we have studied the oxidation of cyanogen, which, in several respects, exhibits a kind of behaviour quite different from that met with in the oxdiation of hydrogen, phosphine and various hydrocarbons. There is evidence of the formation on the vessel wall of activated carbon monoxide molecules, some of which are oxidised immediately to carbon dioxide, and the remainder of which are deactivated. The further oxidation of normal carbon monoxide is inhibited in a remarkable way by cyanogen. An explosion limit exists, but appears to be of a rather special kind, unlike the limits found in the oxidation of hydrogen, and phosphine, and depending on certain particular adsorption relationships.
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