975. ---------------.[FISCHER, F AND BAHR, H.] [High-Carbon Carbides of the Iron Group.] Ges. Abhandl. Kenntnis Kohle, vol. 8, 1929, pp. 255-269; Chem. Abs., vol. 25, 1931, p. 2932.

975. ---------------. [FISCHER, F AND BAHR, H.] [High-Carbon Carbides of the Iron Group.] Ges. Abhandl. Kenntnis Kohle, vol. 8, 1929, pp. 255-269; Chem. Abs., vol. 25, 1931, p. 2932.

When CO is passed at 270° over finely divided Co or CoO, a mass is obtained that appears to contain the carbide Co₃C₂. This substance is decomposed by H₂ at 270°, half the C (presumably derived from the carbide Co₃C) being evolved as CH₄. Similar addition of C to an equimolecular mixture of CuO and Fe₂O₃ affords the carbide Fe₃C₄ in addition to Fe carbonyl. H₂ liberates CH₄ in proportion corresponding with the formula Fe₂C, formed apparently by separation of C from the unstable carbide Fe₃C₄. Small quantities of hydrocarbons are also formed. The Fe, but not the Co, carbide affords, when treated with acids, a mixture of hydrocarbons.