827. ---------------.[EMMETT, P. H., AND BRUNAUER, S.] Use of Low-Temperature van der Waals Adsorption Isotherms in Determining the Surface Area of Iron-Synthetic-Ammonia Catalysts. Jour. Am. Chem. Soc., vol. 59, 1937, pp. 1553-1564; Chem. Abs., vol. 31, 1937, p. 7322.

827. ---------------. [EMMETT, P. H., AND BRUNAUER, S.] Use of Low-Temperature van der Waals Adsorption Isotherms in Determining the Surface Area of Iron-Synthetic-Ammonia Catalysts. Jour. Am. Chem. Soc., vol. 59, 1937, pp. 1553-1564; Chem. Abs., vol. 31, 1937, p. 7322.

Adsorption isotherms of N₂ and A at –195.8°; N₂, A, CO, and O₂ at –183°; CH₄ and NO at –140°; N₂O and CO₂ at –78°; NH₃ at –36°; and n-butane at 0° on 6 different Fe synthetic-NH₃ catalysts were determined. These isotherms together with data on the chemisorption of CO on the catalysts at –183° and –78° and for the activated adsorption of H₂ appear to afford a means of measuring the absolute and the relative surface areas of the Fe catalysts. Al₂O₃ promoters appear to concentrate on the surfaces of the Fe catalysts.