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      1321.  ------.  [I. G. FARBENINDUSTRIE A. G.]  Iron for Catalyzing Ammonia Synthesis.  British Patent 267,554, Mar. 13, 1926.  Chem. Abs., vol. 22, 1928, p. 1221.

            Fe obtained by decomposition of Fe carbonyl may be mixed with a small proportion of Al2O3, MgO, or ZrO2 and a trace of KNO3 and the mixture melted in a current of O2 and the granular product reduced with H2.