3325.     TATIEVSKAYA, E. P.  [Effect of Water Vapor on the Rate of Reduction of Magnetite and Hematite by Carbon Monoxide.]  Jour. Phys. Chem. (U.S.S.R.), vol. 14, 1940, pp. 349-356; Chem. Abs., vol. 36, 1942, p. 3760.

        2.5-20% of H₂O vapor added to CO strongly retards the reduction of Fe₃O₄ at 900°, and especially at 500°; the retardation is more pronounced if the Fe₃O₄ was already partly reduced.  Reduction of Fe₂O₃ is not affected by H₂O at 500° or 900° unless Fe₂O₃ is already partly reduced.  H₂O has no specific effect, it gives CO₂ and H₂ with CO on Fe oxide catalysts, and its apparent action is due to CO₂.  CO₂ does not retard the reduction of Fe₂O₃ to Fe₃O₄.  The inhibition of the reduction of Fe₃O₄ can be accounted for by considering the competition between CO and CO₂ for the magnetite surface.

        ----------.  See abs. 567, 568.