3487.     ---------------.  [TSUTSUMI, S.]  Catalysts for the Synthesis of Liquid Hydrocarbons From Carbon Monoxide and Hydrogen.  II.  Catalysts Prepared by the Precipitation Method.  (2).  Sci. Papers Inst. Phys. Chem. Research (Tokyo), vol. 35, 1939, p. 441-446; Jour. Chem. Soc. Japan, vol. 59, 1938, p. 140; Chem. Zentralb., 1939, I, p. 4752; Chem. Abs., vol. 33, 1939, p. 4747.

                    Activities of Co catalysts, which must be reduced at high temperature, were greatly increased by adding kieselguhr, and the depression in the activities caused by the elevation of the reduction temperature was decreased greatly by a proper amount of kieselguhr, although the optimum reduction temperature was raised with an increase of the amount added.  The rates of elevation of the optimum reduction temperature for Co catalysts, with an increase of the amounts of promoter (Th, U, and Mn oxides) and carrier (kieselguhr) added, differed considerably; a small addition of promoter corresponded to the case where a larger amount of carrier was added.  This fact may be attributed to a difference between the incorporated states of promoter and carrier with Co, the former being more intimately incorporated with Co than the latter.  The difference between promoter and carrier is not so great.