1904. KÖLBEL, H., AND ACKERMANN, P. (Steinkohlen-Bergwerk "Rheinpreussen"). [Hydrocarbons From Gaseous Mixtures of Carbon Monoxide, Hydrogen, and Carbon Dioxide.] German Patent 728,217, Nov. 23, 1942; appl. St 57,312, filed Apr. 6, 1938 (Cl 12 o-1.03). Chem. Zentralb., 1943, I, p. 1741; Chem. Abs., vol. 37, 1943, p. 6856.

Synthesis is carried out with the aid of Fe catalysts. Before the catalysts attain their maximum effectiveness the feed gas contains no CO₂. After the peak is reached the gas may contain CO₂.