2080.     LEFEBVRE, H., AND LECLERC, G.  [Thermomagnetic Study of Iron Catalysts for Hydrocarbon production by Fischer’s Process.]  Compt. rend., vol. 203, 1936, pp. 1378-1380; Chem. Abs., vol. 31, 1937, p. 936.

        When CO+H₂ is passed over the catalyst (A) prepared by reduction in H₂ of the oxide precipitated by NH₃ or NaOH from solution of Fe(NO₃)₃, only gasoline is formed; if, however, about 1% K₂CO₃ is added the catalyst so formed (B), after an initial period of a few hours it produces heavy aliphatic hydrocarbons also.  Thermomagnetic analysis gives for (A) a curve characteristic of magnetite, but for (B) one indicating a solid solution of KFeO₂ in cubic Fe₂O₃ (see abs. 2272).  This is confirmed by the fact that K cannot be extracted from (B) by H₂O, but requires acid (for example, acetic) and that pure H₂ at 250° re-forms magnetite.