3464.     TROPSCH, H., SCHELLENBERG, A., AND VON PHILIPPOVICH, A.  [Reduction of Carbon Monoxide.]  Ges. Abhandl. Kenntnis Kohle, vol. 7, 1925, pp. 63-67; Chem. Abs., vol. 21, 1927, p. 2550.

        Formation of CH4 from a mixture of CO (1 vol.) and H2 (3 vol.) in contact with Ni, which normally occurs quantitatively at 240-250, is greatly diminished by adding NH3 to the gas mixture.  Neither formaldehyde nor hexamethylenetetramine was formed, and the final mixture contained 13% CH4, 15% CO, 64% H2, and 8% Ni.  With a Ni catalyst that had been treated with alkali, the same gas mixture yielded at 400 and atmospheric pressure, 53% CH4 and 1.1% of unsaturated hydrocarbons, the only liquid reaction product being H2O.  The same reaction occurred with a Ni catalyst that had not been treated with Alkali, except that no unsaturated hydrocarbons were formed.  A mixture of equal volumes of CO and H2 in contact with an alkaline Ni catalyst at 400, deposited much C.  With a feebly alkaline catalyst, the final gas contained 27% CO2, 2% CO, 26% H2 and 45% CH4, while, with a more strongly alkaline catalyst, it contained 11% CO2, 29% CO, 50% H2, and 9% CH4.  With both alkaline and neutral catalysts, the CH4 contained 1.5% of higher homologs, reckoned as ethane.  A mixture of equal volumes of CO2 and H2, in contact with neutral Ni at 400, gave a final gas containing 10% CO2, 42% H2, and 48% CH4, while with alkaline Ni it gave 7% CO2, 70% H2, and 23% CH4.  In no case could MeOH be detected.