2948.----- [RUHRCHEMIE, A. G.] [Iron Catalysts For Use in the Hydrogenation of Carbon Monoxide.] German Patent Appl. R 106,876, R 490,Feb. 2, 1940 (Cl. IV d-12 o). FIAT Reel K-20, frames 305-308 A; PB 70,211: TOM Reel 177, frames 1,704-1708; Meyer T

PATENTS

2948.----- [RUHRCHEMIE, A. G.] [Iron Catalysts For Use in the Hydrogenation of Carbon Monoxide.] German Patent Appl. R 106,876, R 490,Feb. 2, 1940 (Cl. IV d-12 o). FIAT Reel K-20, frames 305-308 A; PB 70,211: TOM Reel 177, frames 1,704-1708; Meyer Transl. PC—S—II Fischer-Tropsch, vol. 1, chap. 51, 1948, p. 129

Active Fe catalysts are prepared directly from the decomposition residues of natural argillaceous earth (luxmasse, Lautamasse). Reduction of these materials by the usual procedure gave up to 13% contraction with water gas at atmospheric pressure and 245°. Treatment with boiling H₂O followed by drying and reduction , gave up to 17% contraction. Treatment with complex Cu salts, for example, cuproammonium salts, gave up to 27% contraction. Treatment with boiling alkali hydroxide followed by drying and reduction gave the same value. Catalysts prepared by boiling in a Cu salt solution, for example , Cu nitrate, treating the hot solution with alkali hydroxide, washing with dilute alkali, and reducing as usual, gave 43% and more contraction. In all cases, synthesis at pressures of 10-20 atm. raised contraction values by approximately 30%. The process is of interest because the presence of impurities that ordinarily inhibit catalytic activity, Al, Ti, SO₄-ion, appear to have no inhibiting action in this case.