2946.     ---------------.  [RUHRCHEMIE, A.-G.]  [Production of Cobalt Catalyst by Precipitation With Carbon Dioxide-Ammonia Gas Mixtures.]  FIAT Reel K-20, frames 359-362; PB 70,211; TOM Reel, 287.

        Communication from the Kaiser Wilhelm Institut für Kohlenforschung concerning the production of a very active catalyst.  Co in the form of its nitrate, together with the corresponding amounts of Th or Mg nitrates, is dissolved in water.  A NH₃-CO₂ gas mixture then is introduced cold.  By test filtration the optimum precipitation is determined, and the stream of NH₃ is switched off.  With the CO₂ still flowing, the solution is heated to the boiling point, kieselguhr is added, and the whole is mixed thoroughly.  The catalyst then is dried and reduced with H₂.