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.