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.

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 SiO₃in 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.