46.     ANDERSON, R. B., KRIEG, A., SELIGMAN, B., AND TARN, W. H.  Studies of the Fischer-Tropsch Synthesis.  III.  Influence of Type of Kieselguhrs.  Ind. Eng. Chem., vol. 40, No. 12, 1948, pp. 2347-2350; Chem. Abs., vol. 43, 1949, p. 3167.

                Testing data are presented for a series, 89 in all, of Co : Th : Mg : kieselguhr (100 : 6 : 12 : 200) catalysts prepared with  a number of commercially available American kieselguhrs.  Catalysts containing calcined kieselguhrs had lower activity than similar catalysts with natural kieselguhrs.  These results agree with those previously obtained by Craxford, who found that catalysts prepared with natural kieselguhr had surface areas and activities greater than those of a catalyst containing calcined kieselguhr.  Acid-extracted natural kieselguhrs produced catalysts of the highest activity.  The density of the catalyst varied directly with the density of the kieselguhr, and the distribution of products changed with density of the catalysts, the denser catalysts forming a greater % of light hydrocarbons and CO₂.