2197.     KODAMA, S., MATSUMURA, S., AND TARAMA, K.  Physicochemical Investigations on Coal Synthesis.  IV.  Velocity of Adsorbing Hydrogen by Cobalt.  Jour. Soc. Chem. Ind. (Japan), vol. 44, 1941, pp. 823-825; Chem. Abs., vol. 42, 1948, p. 2080.

        H₂ under atmospheric pressure is brought into contact with Co at 14.5°-275°, and the velocity of adsorption of H₂ by Co is measured.  When t (in min.)/x (cc. H₂ adsorbed per gm. of Co) is plotted against t for each temperature, a straight line is obtained in each case; this shows that there is a relation t/x=t/A+1/A²K, which is the integrated form of dx/dt=K(A-X)², where A and K are constants characteristic of each temperature.  This proves the fact that H is adsorbed in the dissociated state by two active centers of Co.  Study of A and K determined for various temperatures shows that on the surface of Co there are active adsorbing centers of various degrees of activity, and at low temperature the centers of greater activity react.  When the temperature is raised such centers soon become saturated with H, and then the centers of less activity begin to exhibit a measurable velocity of adsorption.  Thus, the higher the temperature the greater the adsorption by active centers of smaller activity.