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 1805.    ---------------.  [KOBOZEV, N. I.]  [Mechanism of the Retarding Effect of Promoters on the Reduction of Iron-Ammonia Catalysts.]  Jour. Phys. Chem. (U.S.S.R.), vol. 8, 1936, pp. 226-233; Chem. Abs., vol. 31, 1937, p. 1559.

        Data are given for the retarding effects of K₂O, BeO, KF, and Al₂O₃ on the reduction of Fe₂O₃ by H₂ and of MgO on that of FeO.  Promoter action of the catalyst results when the added substance is surface-active and reduces the rate of reduction of the Fe oxide.

        See abs. 749.