2213b.     MAXTED, E. B., AND HASSID, N.  Studies in Gaseous Adsorption.  III.  The Thermal Activation Effect in the Adsorption of Hydrogen on Platinum and Nickel.  Jour. Chem. Soc., 1932, pp. 1532-1539; Chem. Abs., vol. 26, 1932, p. 3978.

        Pt and Ni were allowed to adsorb H₂ at a low temperature.  They were then heated to a higher temperature in H₂.  The amount of adsorption at higher temperatures was normal.  After cooling to a lower temperature an abnormal adsorption is obtained.  The sum of the additional values obtained stepwise is substantially the same as if the heating is all one unit.  The effect per degree is greater the lower the original temperature on the scale.  If the heating and cooling are in a vacuum instead of in H₂ the adsorption at the lower temperature is normal.  An explanation without assumption of distinctly different adsorption types is presented.