1405. ------. [I. G. FARBENINDUSTRIE, A. G.] [Process for Carrying Out Hydrogenation Reactions.] German Patent Appl. I 74,060, OZ 13,912. filed Jan. 12. 1943 (Cl. IV b-12 g) FIAT Reel 169. frames 8,078-8,085: PB 25,613: TOM Reel 17, item 39, frames 1,

PATENTS

1405. ------. [I. G. FARBENINDUSTRIE, A. G.] [Process for Carrying Out Hydrogenation Reactions.] German Patent Appl. I 74,060, OZ 13,912. filed Jan. 12. 1943 (Cl. IV b-12 g) FIAT Reel 169. frames 8,078-8,085: PB 25,613: TOM Reel 17, item 39, frames 1,133-1,140; Meyer Transl. PC-S-II. Fischer-Tropsche. Vol. 3. chap. 114, 1948. p. 22.

In carrying out catalytic hydrogenation reactions, such as ammonia synthesis, hydrogenation or organic compounds, and conversion of CO with H₂, catalysts are used that are obtained by reduction with H₂ of compounds of metals of the Fe group at 300º-500º, treatment of the cooled reduction products with weakly oxygenated gases until O₂ adsorption slackens or ceases, and renewed reduction at a temperature (150º-250º) below that of the 1^st reduction step. Catalysts produced in this manner are said to maintain their efficiency over longer periods of operation and are immune to the action of air.