823.    ---------------.  [EMMETT, P. H., AND BRUNAUER, S.]  Adsorption of Nitrogen by Iron-Synthetic-Ammonia Catalysts.  Jour. Am. Chem. Soc., vol. 56, 1934, pp. 35-41; Chem. Abs., vol. 28, 1934, p. 1243.

     Rates of adsorption of N2 by promoted and by pure Fe catalysts were measured over the temperature range 273-450.  The energy of activation of the adsorption process is about 16,000 cal.  Isotherms at 400 and 450 indicate a heat of adsorption of about 35,000 cal.  Isotherms taken at 189 are linear with respect to pressure 100-760 mm.