829.    EMMETT, P. H., AND HARKNESS, R. W.  Adsorption of Hydrogen by Iron-Synthetic-Ammonia Catalysts.  Jour. Am. Chem. Soc., vol. 57, 1935, pp. 1631-1635; Chem. Abs., vol. 30, 1936, p. 369.

      Experimental evidence is presented to show that the two types of activated adsorption of H2 that occur on Fe-synthetic-NH3 catalysts are, in part at least, adsorptions on the surface of the catalysts rather than any type of solution within the metal.  The rate of the lower temperature-activated adsorption (type A) agrees closely with that calculated by assuming that all H2 molecules are adsorbed that strike the catalyst with the observed energy of activation, 10,400 cal.