62.     ANTHEAUME, J., DECARRIÈRE, E., AND RÈANT, R.  [Physicochemical Study of the Iron Catalyst Used in the Synthesis of Liquid Hydrocarbons.]  Chim. et ind., Special No., April 1934, pp. 421-423; Compt. rend., vol. 196, 1933, pp. 1889-1890; Brennstoff-Chem., vol. 15, 1934, p. 413; Chem. Abs., vol. 28, 1934, p. 5935.

               From investigations by the thermomagnetic-analysis method of Chaudron and coworkers for the study of metallic oxides (Forestier and Chaudron, abs. 1054), it is concluded that catalytic conversion does not take place in presence of either Fe₂O₃ alone or of Fe₃O₄ alone.  In every case in which catalytic activity is manifested, Fe₃O₄ is present, and the activity increases with the fineness of the crystalline structure.  The authors admit that, with their catalysts, the production of higher hydrocarbons by hydrogenation takes place in the presence of complex solid solutions.