2026.     ---------------.  [KWAN, T.]  Adsorption of Hydrogen on Nickel, Cobalt and Platinum at Low Pressures.  Jour. Research Inst. Catalysis, vol. 1, 1949, pp. 81-94; Chem. Abs., vol. 44, 1950, p. 4304.

        Adsorption isotherms of H at pressures between 10^-3 and 1 mm. Hg on Ni, Pt, and Co powders and 50°-300° were determined with special care for absence of adsorption-desorption hysteresis.  Surface areas of the samples were determined by the Brunauer-Emmett-Teller method.  Initial H adsorption equal to 26, 18, and 19 kg.-cal. per mol. for Ni, Pt, and Co, respectively, at 300°.  After about 0.1 of the surface is covered, there is a gradual decrease in the heat of adsorption.  On statistical-mechanical considerations an expression was derived for the relation between the differential heat of adsorption on H and the fraction of the sorbent surface covered.  Comparison between observed and calculated data for this relation shows satisfactory agreement and is interpreted to mean that the Brunauer-Emmett-Teller measured surfaces of these materials are homogeneous and completely available for H adsorption.