825. ---------------.[EMMETT, P. H., AND BRUNAUER, S.] Accumulation of Alkali Promoters on Surfaces of Iron-Synthetic-Ammonia Catalysts. Jour. Am. Chem. Soc., vol. 59, 1937, pp. 310-315; Chem. Abs., vol. 31, 1937, p. 2915.

825. ---------------. [EMMETT, P. H., AND BRUNAUER, S.] Accumulation of Alkali Promoters on Surfaces of Iron-Synthetic-Ammonia Catalysts. Jour. Am. Chem. Soc., vol. 59, 1937, pp. 310-315; Chem. Abs., vol. 31, 1937, p. 2915.

By comparing the adsorption isotherms for N₂ at –183°, CO at –183°, and CO₂ at –78° on various Fe-synthetic-NH₃ catalysts, evidence was obtained to show that a % or so of K₂O in the catalysts will actually cover more than 50% of the surface of the reduced catalyst. Apparently the chemisorption of CO at –183° occurs principally on surface Fe atoms, whereas the chemisorption of CO₂ at –78° occurs on such surface promoter molecules as contain alkali.