3366.     TELEGIN, V. G., SIDOROV, N. V., AND SHPULENKO, K. B.  [Effect of the Content of Aluminum Oxide in the Iron Catalysts for Synthesis of Ammonia Upon Its Activity at Atmospheric Pressure.]  Jour. Appl. Chem. (U.S.S.R.), vol. 13, 1940, pp. 823-830 (in French, p. 830); Chem. Abs., vol. 35, 1941, p. 2287.

        Chemical compositions of NH₃ catalysts were FeO, Fe₂O₃, Al₂O₃, and K₂O, respectively, (1) 32.05, 64.40, 3.55, and 0%; (2) 27.75, 63.00, 9.25, and 0%; (3) 25.15, 46.60, 28.25, and 0%; (4) 13.40, 25.50, 61.10, and 0%; (5) 20.40, 71.10, 5.20, and 2.94%; (6) 20.30, 52.70, 25.00, and 2.50%; and (7) 14.50, 43.60, 39.60, 2.10%.  The catalysts were prepared by fusion of magnetite with Al₂O₃ and with Al₂O₃ and KNO₃ in the electric furnace.  The activity of catalysts was determined at a volume velocity of N₂-H₂ gas mixture of 15,000 l. per hr. per l. of catalyst at 310°-500°; for the last 3 catalysts also at a volume velocity of gas mixture of 2,000, 5,000, and 10,000.  In all cases, activity decreased with an increase of Al₂O₃ content.  A minimum amount of Al₂O₃ necessary for the stabilization of microstructure and activity of reduced Fe in the NH₃ catalyst should be determined by the working conditions.  Thus, if a catalyst containing 0.1% Al₂O is stable enough at a temperature below 450° at atmospheric pressure, then for stable activity at 500° and 300 atm. the catalyst should have up to 5% Al₂O₃.  The binary catalysts (Fe-Al oxides) were more active than ternary catalysts (Fe-Al-K oxides), probably because of the poisonous effect of K₂O.

        TELLER, E.  See abs. 389, 2230.

        TEMKIN, M.  See abs. 1773.