3599.     WARNER, B. R., DERRIG, M. J., AND MONTGOMERY, C. W.  Catalytic Synthesis of Hydrocarbons and Oxygenated Compounds From Ketene and Its Relation to the Fischer-Tropsch Synthesis.  Jour. Am. Chem. Soc., vol. 68, 1946, pp. 1615-1617; Chem. Abs., vol. 40, 1946, p. 7149.

        The fact that CH2 and CO can combine to form ketene (CH2CO) indicates the possibility that ketene may form and may be intermediate in the Fischer-Tropsch synthesis.  Experiments determined that CH2CO in the presence of H2 reacts on a Co-ThO2-kieselguhr catalyst at 200 to yield hydrocarbons and oxygenated compounds, which are similar to the products of the Fischer-Tropsch synthesis.  A reasonable assumption to explain the experimental results involves preliminary catalytic decomposition of CH2CO→CH2+CO followed by polymerization of CH2, or by reactions involving higher ketenes and formation of oxygenated compounds.  A reaction mechanism for the Fischer-Tropsch synthesis might be postulated as follows:  (a) CH2CO→CH2+CO; (b) CH2+CH2CO→CH3CH=C=O; (c) CH3CH=C=O→CH2=CH2+ CO; (d) CH2+CH3CH=C=O→CH3CH2CH=C=O→CH3CH=CH2+CO.