3491.     ---------------.  [TSUTSUMI, S.]  Catalysts for the Synthesis of Liquid Hydrocarbons From Carbon Monoxide and Hydrogen.  VI.  Selection of Catalysts for the Synthesis.  (2).  Sci. Papers Inst. Phys. Chem. Research (Tokyo), vol. 36, 1939, pp. 251-261; Chem. Abs., vol. 34, 1940, p. 314.

        Activity of a Ni catalyst, prepared by precipitation from nitrate solution by K2CO3, followed by reduction of the oxide by H2, diminished more rapidly with increase of temperature of reduction than that of a similar catalyst prepared by roasting.  Apparently, K2CO3 and KNO3 were absorbed on the active spots.  A Ni-10% Al2O3-100% kieselguhr catalyst prepared by the precipitation method was fairly active for the CO-H2 synthesis but showed a high optimum reduction temperature, 450-500.  Reduction of the proportion of Al2O3 to 7.5%, or substitution of about 50% of the Ni by Co, lowered the optimum reduction temperature.  Ni-10% Al2O3 and Ni-10% Al2O3-100% kieselguhr catalysts prepared by precipitation were about as active as a Ni-10% Al2O3 catalyst prepared by roasting, for the hydrogenation of C6H6 but were more active for the CO-H2 synthesis.