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Literature Abstracts

 1535.    ---------------.  [IIZIMA, S.]  [Sorption of Hydrogen by Reduced Nickel.  II.  At Low Temperatures.]  Sci. Papers Inst. Phys. Chem. Research (Tokyo), vol. 23, 1933, pp. 34-43.  Chem. Abs., vol. 28, 1934, p. 2589.

       Adsorption of H₂ under low pressures by reduced Ni was measured at 100°, 19°, 0°, -45.2°, -78.5°, -112° and –183.5°.  The results of Nikitin, see abs. 2469, at 19° were not confirmed.  Ni and H₂ did not form a compound at 19°.  Isobars all showed maxima 0°-20°, and minima were found between –80° and –180°.  The lower the equilibrium adsorption pressure the lower the temperature of the minimum.  Irregularities in the isothermal at –183° are accounted for on the basis of local heating of the adsorbent due to adsorption of large quantities of H₂.  The isothermal is smooth when H₂ is admitted slowly.