992.    ---------------. FISCHER, F., AND MEYER, K.]  [Suitability of Alloy Skeletons as Catalysts for Benzine Synthesis.]   Brennstoff-Chem., vol. 15, 1934, pp. 84-93, 107-110; Ber. Deut. Chem. Gesell., vol. 67B, 1934, pp. 253-261; Ges. Abhandl. Kenntnis Kohle, vol. 12, 1937, pp. 356-382; British Chem. Abs., 1934, A, p. 389; Chem. Abs., vol. 28, 1934, p. 2871.

     Catalysts prepared by Raney’s method by dissolving Al or Si from alloys with Ni and Co are effective in hydrocarbon synthesis from water gas.  The best results are obtained with a Ni-Co-Si alloy, in weight proportions of ½:½:1, from which the Si is removed as completely as possible with caustic soda.  The effect of particle size, depth of catalyst, and depth of technical raw material is investigated.  The activity of a mixed Ni-Co catalyst is decreased by Fe.  With pure raw materials, the maximum yield of liquid hydrocarbons was 96 cc./m.³ of mischgas (23% CO and 46% H₂) and with technical material 80 cc.  The addition of 10% Mn increased the yield with technical material to 88 cc.  By increasing the amount of catalyst, the yield of liquid hydrocarbons can be considerably increased without cutting down the space velocity.  With a mischgas containing 31.7% CO and 65% H₂, 161 cc. of liquid products could be obtained/m.³ of mischgas.  Under special operating conditions, the space velocity can be increased 4-fold without any decrease in the yield.  Addition of Cu decreases markedly the efficiency of Ni and Co alloys.  By remelting catalysts poisoned by S with Si the original activity of the catalyst can be restored.  The advantages and disadvantages of alloy skeletons are presented.