1030.    FISCHER, F., BAHR, T., AND MEUSEL, A.  [Catalytic Reduction of Carbon Dioxide to Methane and Higher Hydrocarbons at Ordinary Pressure.  Preliminary Communication.]  Brennstoff-Chem., vol. 16, 1935, pp. 466-469; Ges. Abhandl. Kenntnis Kohle, vol. 12, 1937, pp. 263-270; Chem. Abs., vol. 30, 1936, p. 3967.

       When Ru powder or Ru-Th asbestos is used as contact catalyst, CO₂ may be appreciably reduced to CH₄ from 100° upward.  Addition of CaCO₃ or Rb₂CO₃ results in the formation, from 170° upward, of higher gaseous and fluid hydrocarbons.  Weaker alkalies do not have this effect on the catalyst.