3489.     ---------------.  [TSUTSUMI, S.]  Catalysts for the Synthesis of Liquid Hydrocarbons From Carbon Monoxide and Hydrogen.  IV.  Catalysts Prepared by the Roasting Method.  (2).  Sci. Papers Inst. Phys. Chem. Research (Tokyo), vol. 36, 1939, pp. 47-52; Chem. Zentralb., 1939, II, p. 3044; Chem. Abs., vol. 33, 1939, p. 6535.

        Optimum reduction temperature for Co catalysts prepared by roasting is lower and the decrease in activity from using high reduction temperatures is greater than for precipitated Co catalysts.  The amount of kieselguhr in the roasted catalysts must be increased to raise their activity.  The decrease in activity of roasted Co catalysts is greatest when Mn is used as a promoter, less the heavier ThO₂, and least with the heaviest U₃O₈.