PATENTS

2695. PINE, P. R., AND RAY, E. C. (The Harshaw Chemical Co.) Preparation of Extruded Iron Oxide Catalysts. United States Patent 2,457,719, Dec. 28, 1948; appl. filed Apr. 3, 1947, Serial No. 739,267; 4 claims (Cl. 252-259). Chem. Abs., vol. 43, 1949, p. 3162.

Paste is formed consisting of ferrous carbonate, a compound of a catalytic metal of atomic number 22-30, excluding Fe, capable of yielding the oxide on calcination, a compound of an alkali metal capable of yielding the oxide on calcination, and H2O. The proportions of the product after calcination shall be, 2-30% oxide of the catalytic metal, up to 28% oxide of the alkali metal, and not less than 70% Fe oxide, percentages based on total weight of final product. H2O shall be present in proportion suitable for extrusion. The paste is extruded, shaped, and sized. The catalyst is heated to 110-150 C. to remove H2O and then calcined at 900-950 C. for 2-6 hr. 2 United States patents cited.