465.    ---------------.[CHAKRAVARTY, K. M.]  Catalytic Formation of Methane From Carbon Monoxide and Hydrogen.  VI.  Poisoning by Carbon Deposition.  Jour. Indian Chem. Soc., vol. 16, 1939, pp. 663-670; Chem. Zentralb., 1940, II, p. 723; Chem. Abs., vol. 34, 1940, p. 4723.

                  Deposited C may be adsorbed on Ni particles or may form a simple layer on the surface.  Moreover, Ni may undergo carbide formation and Ni₃C may have catalytic activity.  It has been shown that the reaction 2CO=C+CO₂ is catalyzed by Ni and also by Ni₃C.  The reaction CO+3H₂=CH₄+H₂O is 2.50, Cu 0-1.50, Mg 0.70-1.30, Si 0.10-0.35, and Fe 0.10-0.50%.  Al is the remainder, but so that if Cu is near its maximum, the total of the Ni, Sb, and Si is near the lower limit and vice versa.  The alloy may also contain Mn up to 0.25%.