2033.     LACHINOV, S. S., AND TELEGIN, V. G.  [Activity and Stability of Iron Catalysts for the Synthesis of Ammonia.]  Jour. Chem. Ind. (U.S.S.R.), No. 12, 1934, pp. 31-33; Chem. Abs., vol. 29, 1935, p. 2311.

        Al₂O₃, MgO, and SiO₂ activate Fe catalysts but do not make them stable.  K₂O renders them stable but gives decreased activity.  K₂O and SiO₂ together form gives decreased activity.  K₂O and SiO₂ together form a good activator, but the catalyst is quite unstable.  K₂O and Al₂O₃ or MgO and SiO₂ gives a very stable catalyst.  Mechanisms of activation are discussed.