Return to Abstracts of Literature

Return to Abstracts of Literature 1250-1499

Literature Abstracts

 1359.    ---------------.  [HARKNESS, R. W., AND EMMETT, P. H.] Two Types of Activated Adsorption of Hydrogen on the Surface of a Promoted Iron Synthetic Ammonia Catalyst.  Jour. Am. Chem. Soc., vol. 56, 1934, pp. 490-491; Chem. Abs., vol. 28, 1934, p. 1588.

        There are 3 types of adsorption of H on a promoted Fe catalyst (1.3% Al₂O₃ and 1.59% K₂O); Physical, at –196°, -183°, and –144°, at which temperatures 10 cc. of catalyst adsorbs 5, 2.8, and 0.25 cc. H, respectively; type A activated, between –78° and 0°, the isobar at 760 mm. showing a gradual decrease from an adsorption of 7-8 to 5-6 cc.; type B activated, at 100° or higher, an additional but much slower adsorption, the total adsorption of both types reaching 8-9 cc. at 100° in 2 hr.; at 212° and 450° the adsorption reached an apparent equilibrium in less than 1 hr., the adsorption being 5.5 and 3.5 cc., respectively.