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.