1682. ------. [INTERNATIONAL HYDROCARBON SYNTHESIS CO.] [Hydrocarbons From Carbon Monoxide and Hydrogen.] Netherlands Patent 55,196, Sept. 15, 1943. Chem. Abs., vol. 41, 1947, p. 3603.

Catalyzers are prepared from a solution containing Fe and Ni salts by precipitating gradually at 40° or less and pH not under 8 while the solution is added to the precipitating liquid. The precipitate is then reduced. In an example, 9 1: of a solution in H₂O of 725 gm. Fe (NO₃)₃·9H₂O and 480 gm. Ni(NO₃)₂·6H₂O, and 268 gm. Al (NO₃)₃·9H₂O is trickled in 48 hr. into 9 1. aqueous solution of 1010 gm. K₂CO₃. The liquid and precipitate are boiled for 5 min., filtered, washed with H₂O, and dried in air at 110° . Then 50 cc. unreduced catalyst, containing 5.6 gm. Fe and Ni is reduced by H₂ for 5 hr. at 350° . This catalyst loses only 10% activity in 6 weeks. Precipitating in the inverse way or quickly gives much heavier catalyzers, of which more is needed to fill the same reaction space.