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 1st 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 1st 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.