PATENT

3320.  SEGURA, M. A., MCADAMS, D. R., AND SPICER, W. E.  (Standard Oil Development Co.).  preparation of a Fluid Catalyst for Hydrocarbon Synthesis.  United States Patent 2,541,671, Feb. 13, 1951; appl. filed Sept. 5, 1946, Serial No.  695,042; 4 claims (Cl. 252-474). Chem., Abs., vol. 45, 1951, p. 4430.

Fluidizable Fe catalysts are obtained by subjecting reduced, precipitated Fe oxides to a sintering treatment 1,300° F. in an oxidizing atmosphere and grinding the sintered material to 30-250 μ or 60-400-mesh.  A reducing treatment 800°-1500° F. may precede or follow the grinding.  It is important that the sintering be after any treatment with liquids or solids, which affects the chemical composition and/or physical structure of the catalyst.  Best results are obtained with Fe oxide powders, with uniform particle size less than 30 μ.  fluidizability is combined with high attrition and high activity.  10 United States patents cited.