989.    ---------------.  [FISCHER, F., AND MEYER, K.]  [Activating Action of Ammonia Upon the Reduction and Activity of Nickel Catalysts.]  Brennstoff-Chem., vol. 14, 1933, pp. 86-89; Ges. Abhandl. Kenntnis Kohle, vol. 11, 1934, pp. 555-561; Chem. Abs., vol. 27, 1933, p. 3801.

      Presence of NH₃ during the preparation of the catalyst increases subsequent yields in the benzine synthesis from CO and H₂.  Reduction temperatures for maximum yields of fluid products are lowered from 450° to 300°-350°.  Addition of NH₃ during the reduction, however, lowers the yields.  Addition of 5% dry K₂CO₃ to the catalyst, prepared in presence of NH₃ to increase alkalinity, decreases its activity slightly.  Impregnation with K₂CO₃ by solution almost completely removes activity.