3538.     USACHEV, P. V.  [Conference on Heterogeneous Catalysis, Moscow, May 13-16, 1940.  Mechanism of the Catalytic Synthesis of Ammonia.]  Jour. Phys. Chem. (U.S.S.R.), vol. 14, 1940, pp. 1246-1249; Chem. Abs., vol. 35, 1941, p. 3882.

        Addition of 7% Al₂O₃ to an Fe catalyst gives optimum results.