2460.     NICOLAI, J., D’HONT, M., AND JUNGERS, J. C.  [Synthesis of Methane From Carbon Dioxide and Hydrogen Over Nickel.]  Bull. soc. chim. belg., vol. 55, 1946, pp. 160-176; Chem. Abs., vol. 41, 1947, p. 4699.

        Kinetics are compared for the hydrogenation of CO and CO₂ over Ni in the pressure range of 0.1-1 atm. and temperature range 180°-300°.  Kinetics of the CO-H₂ reaction indicate that H₂ is feebly adsorbed, CO strongly adsorbed by Ni.  The velocity is not significantly affected by the presence of the products.  Reaction is more rapid when D₂ is used in place of H₂.  Kinetics of the CO₂-H₂ reaction indicate that both reactants are weakly adsorbed, the products retard the reaction and D₂ behaves exactly like H₂.  Hydrogenation of CO is slower and has a higher activation energy than that of CO₂.  When a mixture of CO and CO₂ is hydrogenated, the CO, very strongly adsorbed, reacts completely first, the CO₂ then reacts more rapidly.