3494.     ---------------.  [TSUTSUMI, S.]  Catalysts for the Synthesis of Liquid Hydrocarbons From Carbon Monoxide and Hydrogen.  IX.  Relation Between the Surface Dispersity of Catalysts and the Catalytic Activities.  Sci. Papers Inst. Phys. Chem. Research (Tokyo), vol. 36, 1939, pp. 344-351; Chem. Abs., vol. 33, 1939, p. 9103.

        Co-kieselguhr catalysts for the hydrogenation of benzene were prepared by 3 methods:  (a) CO(NO₃)₂ was treated with K₂CO₃ in the presence of kieselguhr.  (b) Co(NO₃)₂ was treated with K₂CO₃, and the precipitate was dried and mixed with kieselguhr in a little H₂O.  (c) Co(NO₃)₂ and kieselguhr were mixed and roasted.  The products were dried and reduced by H₂ at various temperatures.  The optimum ratios and reduction temperatures were determined.  The activities of the catalysts prepared by these methods were in the order 2>1>3.  Optimum ratios of Co to kieselguhr were 1:10 to 1:20 for (a), and 1:40 for (b) and (c).  The rate of elevation of the optimum reduction temperature with increase in kieselguhr was largest for (a) and smallest for (b).  The small rate for (b) was attributed tot he high degree of surface dispersity of Co on kieselguhr.  Corresponding results were obtained with a (4Ni+Co)-7.5% Cr catalyst.