678. ------. [FISCHER, F., AND PICHLER, H.] (Studien- und Verwertungs-G. m. b. H.). Process for Producing Iron Catalysts. German Patent Appl. St. 60,795, filed May 23, 1941 (Cl. 12 o-1.03). TOM Reel 100.

Patent Abstracts

678. ------. [FISCHER, F., AND PICHLER, H.] (Studien- und Verwertungs-G. m. b. H.). Process for Producing Iron Catalysts. German Patent Appl. St. 60,795, filed May 23, 1941 (Cl. 12 o-1.03). TOM Reel 100.

A process for producing precipitated Fe catalysts for synthesis of hydrocarbons from H₂ and C oxides consisting in decomposing an Fe salt solution at temperatures <50º with soda to such an extent that no precipitate is formed and then heating the solution to boiling after the following precipitation step. The precipitate is then washed, alkalized with 0.125%-1% K₂CO₃, and dried at 100º-120º. Example: 1 kg. of an acid Fe nitrate solution obtained by dissolving 900 gm. of Fe shavings in 10 l. of dilute HNO₃ (density 1.12) is decomposed at room temperature in 4 l. of soda solution. The Fe solution becomes dark red without a precipitate being formed. The solution is filtered and 10 l. of the solution are diluted with 25 l. of H₂O and heated to boiling, made slightly alkaline, and after precipitating heated to boiling for 1 min. The precipitate is then filtered and washed until alkali-free and then alkalized with 0.25% of K₂CO₃ and dried at 110º. The completed catalyst is solid, dark-brown to black in color, and shows a lustrous fracture. Before use for the synthesis process, the catalyst is pretreated for 3 days with a 1:2 mixture of CO:H₂ at 250º and 1 atm. On passing a synthesis gas of CO:H₂=3:2 over it at 15 atm. and 250º, 150 gm. of solid, liquid and gasol hydrocarbons are obtained per m.³ of gas. The catalyst will last for many years.