564.    CHUFAROV, G. I., AND AVERBUKH, B. D.  [Initial Rate of Reduction of Hematite and Magnetite by Hydrogen.]  Ztschr. Physik. Chem., vol. B-33, 1936, pp. 334-348; Chem. Abs., vol. 31, 1937, p. 24.

      Reduction of hematite and magnetite by H₂ was studied between 300° and 800° and at pressures between 0.1 and 0.001 mm. Hg.  The autocatalytic nature of the reaction is satisfactorily explained by the formation of active centers during the course of the reaction.  Above 600°, the lower rate as compared with that at lower temperature is due to recrystallization of these centers.

                 Reduction of Iron Oxides by Gaseous Reducing Agents.  II.  Rate of Reduction of Magnetic Iron Oxide by Hydrogen.  See abs. 566.