787.    ---------------.  [EIDUS, Y. T.]  [Reduction of Catalysts for the Synthesis of Aliphatic Hydrocarbons From Mixtures of Carbon Monoxide and Hydrogen.]  Jour. Gen. Chem. (U.S.S.R.), vol. 16, 1946, pp. 875-883; Chem. Abs., vol. 41, 1947, p. 1824.

     A comparative study was made on reduction of the following water-gas catalysts:  Co-ThO₂-kieselguhr (100:18:100), Fe-Cu-ThO₂-K₂CO₃-kieselguhr (100:25:2:2:125), and Fe-Cu-ThO₂K₂CO₃-marshallite (100:25:2:2:125).  The general course of reduction was similar in both catalyst types, with the maximum reduction rate occurring at the beginning of reduction.  Reduction with H₂ at 375° proceeds more rapidly and results in twice as great a loss in weight in the 1^st catalyst as was observed for the 2d and 3d catalysts at 250°; the latter catalysts are reducible with H₂ only to the extent of 82%.  Interaction of these catalysts with CO first results in further reduction of the former (loss in weight) followed by carbide formation (weight gain).  CO is adsorbed on the 1^st catalyst 4 times more effectively than on the 2d or 3d, after H₂ reduction.  Slow heating-up of the latter catalysts during H₂ reduction gives the most active catalysts.