3364.     TELEGIN, V. G., AND SIDOROV, N. V.  [Utilization of Artificial Magnetite as a Raw Material for the Preparation of the Catalyst for Ammonia Synthesis.]  Jour. Appl. Chem. (U.S.S.R.), vol. 11, 1938, pp. 1064-1070 (in French, p. 1070); Chem. Abs., vol. 33, 1939, p. 4386.

        Magnetite was prepared from commercial Fe (containing C, 0.12; Si, 0.09; and Mn, 0.05%) by oxidation with O2 at 1,470-1590.   The magnetite obtained was mixed with Al2O3 and KNO3, and the mixture was used for the preparation of catalyst by electric fusion.  The activity of the catalyst obtained was higher than that prepared from the concentrates of natural magnetite; this is explained by the small amount of SiO3 in the artificial magnetite.  The activity of catalyst prepared from an artificial magnetite, after heating at 625 for 8 hr. in the N2-H2 atm., was changed as follows:  The activity corresponding to 400, 450, and 475 decreased, but that corresponding to 500 and 525 increased.  9 refs.