3563.     ---------------.  [VIGNON, L.]  [Formation of Methane by Catalysis From Carbon Monoxide and Water Vapor.]  Compt. rend., vol. 157, 1913, pp. 131-134; Chem. Abs., vol. 7, 1913, p. 3602.

        Substances studied as catalyzers were Fe, Ni, Cu, and the oxides of Si, Al, and Mg.  The catalyzers were placed in a glazed porcelain tube and heated at different temperatures in the electric furnace, the temperature being taken from the midst of the catalyzer by a Le Chatelier couple.  The temperatures at which a maximum yield of CH4 was obtained and the % present in the resulting gas after deducting CO2 and CO are as follows:  Al2O3, 950, 39.1%; MgO, 900, 58.7%; SiO2, 750, 43.5%; Fe, 950, 35.5%; Ni, 400, 89.3%; Cu, 700 74.1%.  With Fe, Al2O3, and SiO2, carbides are evidently an intermediate product and these carbides, as soon as formed, are acted upon by H2O vapor with the formation of CH4; for example, 12CO+2Al2O3=C3Al4+9CO2; C3Al4+6H2O=3CH4+2Al2O3.  Another explanation for the formation of CH4 is that under the influence of catalyzers the following reactions take place:  CO+H2O=CO2+H2; 3H2+CO=CH4+H2O; 4H2+CO2=CH4+2H2O.