3881. ------. [WATTS, R. N.] (Standard Oil Development Co.). Preparation of a Spheroidal Fischer-Tropsch Catalyst. United States Patent 2,530,345, Nov. 14, 1950; appl. filed Sept. 30, 1948, Serial No. 51,987; 10 claims (Cl. 252-443).

PATENTS

3881. ------. [WATTS, R. N.] (Standard Oil Development Co.). Preparation of a Spheroidal Fischer-Tropsch Catalyst. United States Patent 2,530,345, Nov. 14, 1950; appl. filed Sept. 30, 1948, Serial No. 51,987; 10 claims (Cl. 252-443).

Catalyst in the form of small spheres is obtained by passing Fe wire containing <0.2% C through a metallizing gun. The promoter, 1-5 wt. % based on Fe, is incorporated with the Fe particles either by precoating the wire before passing it through the gun or by using an uncoated wire and quenching the molten particles issuing from the gun in a solution containing the promoter. The oxidized coating on the Fe cores has a thickness up to 20 μ. The depth is controlled by using an atmosphere in which O₂ concentration is controlled, 5-60% O₂ and the distance of travel for the particles 0.5-3 ft. The extent of oxidation is a function of the distance of its travel path beyond the reducing atmosphere. 9 United States patents cited.