984.    ---------------.  [FISCHER, F., AND KOCH, H.]  [New Developments in the Adaptation of Cobalt Catalysts to the Benzine Synthesis.]  Brennstoff-Chem., vol. 13, 1932, pp. 61-68; Ges. Abhandl. Kenntnis Kohle, vol. 10, 1932, pp. 556-577; British Chem. Abs., 1932, B, p. 376; Chem. Abs., vol. 26, 1932, p. 2582.

     By increasing the activity of Co catalysts, the yield of liquid hydrocarbons has been increased from 100 to 153 cc./m.³ of gas mixture or to 71% of the theoretical.  As catalysts, Co+18% Th precipitated with K₂CO₃ and Co+15% Mn precipitated with Na₂CO₃ were equally effective when used on kieselguhr as carrier.  The influence of various precipitating agents in catalyst preparation and the effect of varying the proportion of carrier to catalyst and to activator in the catalyst at various temperatures have been determined.  The use of Cu as activator for the Co resulted in lower reduction temperatures in the preparation of the latter by precipitation from the nitrate.  Such catalysts, however, almost completely lost their activity at temperatures >350° and in H₂.  Co catalysts have been used more than 2 months without interruption.  Complete regeneration is effected simply by extracting the accumulated paraffins.  In experiments to determine the reaction mechanism, the extent to which Co catalyst influenced the reaction CO+H₂O→CO₂+H₂ was found strongly dependent upon reaction temperature.  At 200° the effect was the same and at 235° much better than with Fe catalysts.