45.     ANDERSON, R. B., HALL, W. K., HEWLETT, H., AND SELIGMAN, B.  Studies of the Fischer-Tropsch Synthesis.  II.  Properties of Unreduced Cobalt Catalysts.  Jour. Am. Chem. Soc., vol. 69, 1947, pp. 3114-3119; Chem. Abs., vol. 42, 1948, p. 2739.

               Surface-area and pore-volume studies are reported for 2 types of unreduced Co Fischer-Tropsch catalysts and for similar preparations with promoters, kieselguhr, or both omitted.  Properties of the catalysts are compared and related to properties of the kieselguhrs that they contain.  Areas of unreduced precipitated Co Fischer-Tropsch catalysts were several times greater than those of the kieselguhr used as carriers.  Catalysts prepared with natural kieselguhrs had larger areas than those prepared with calcined or flux-calcined kieselguhrs.  Areas of unreduced catalysts varied from 60-150 m.² per gm.  Average pore diameters of granular catalysts varied from 500 Å. to 770 Å. and for pelleted catalysts from 165Å. to 310Å.  Surface areas of pelleted catalysts were 10-20% lower than the areas of the corresponding granules.  It was shown that the Co basic carbonate-promoter complex was precipitated chiefly in the void space of the kieselguhr.  Preparations without promoters, kieselguhr, or both had areas of the Co complex per gm. of complex that roughly equaled the area of the complex of the catalyst.  Natural kieselguhr as a carrier considerably increased the area of the Co complex.  Catalysts prepared in small batches were quite reproducible with respect to surface area, but the areas of catalysts prepared in large batches varied considerably.