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 1831.    KOCH, H., AND KÜSTER, H.  [Catalytic Reduction of Carbon Dioxide With Hydrogen.]  Brennstoff-Chem., vol. 14, 1933, pp. 245-251; Ges. Abhandl. Kenntnis Kohle, vol. 12, 1937, pp. 249-262; British Chem. Abs., 1933, B, p. 737; Chem. Abs., vol. 27, 1933, p. 5154.

        Catalyst of Co and Ni for the synthesis of benzine is very effective at 150° in the production of CH₄.  Traces of CO- and O₂-containing compounds were found in a few cases.  With a large excess of CO₂, complete equilibrium is reached, which at 150°-400° is almost completely toward the CH₄ side.  Adding steam at the start strongly retards the reaction by increasing the H₂ concentration.  When blast-furnace gas treated with steam is used, a N₂-diluted CO₂-H₂ mixture is obtained, which, passed over CO, gives CH₄.  CH₄ is obtained quantitatively from a similar CO₂-H₂-N₂ mixture passed over Ni.  Passing CO and steam over Ni gives 3:1 CO₂ and CH₄.  MeOH, a possible intermediate compound, is completely decomposed in the presence of CO₂ over Ni at >200°.  S compounds poison the catalyst.