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 1702.    ---------------.  [KAWAKITA, K.]  [Kinetics of the Reduction of Ferric Oxide.]  Rev. Phys. Chem. Japan, vol. 14, 1940, pp. 79-85; Chem. Abs., vol. 35, 1941, p. 961.

       Rate of reduction of Fe₂O₃ by H₂, dx/dt, measured in a static system, equals kxⁿ (a-x), where x is the amount of H₂ reacted, a is the initial H₂ concentration, k is the rate constant, and n is a topochemical factor related to the number of reaction nuclei and to their rate of propagation.  At 500° and 600°, many nuclei are formed at the start of the reaction and n=0, and the reaction is approximately 1^st order.  At 265° very few nuclei are formed initially and n=1, giving a maximum rate when x=a/2.  n decreases as k increases.  As the temperature increases above 265° the maximum rate is larger and appears earlier.    

       KAWAMICHI, K.  See abs. 1854.