135.    BAHR, T.  [Reduction of Carbon Monoxide and Carbon Dioxide on Oxide Catalysts.]  Ges. Abhandl. Kenntnis Kohle, vol. 12, 1937, pp. 292-297; Chem. Zentralb., vol. II, 1937, p. 3990; Chem. Abs., vol. 32, 1938, p. 6435.

                 CO was reduced at 250°-495° over S-resistant catalysts.  Over MoO₃-ThO₂ (1:1) with 10% BaO and at 1 atm. and 350°-495°, 10-17% of CH₄ was obtained.  In reduction at higher temperatures the hydrocarbon showed a somewhat higher C number.  The reaction occurred as follows:  2 CH+H₂=CH₄+CO₂.  Results were similar with a catalyst of Cr₂O₂-MoO₃ (1:1) with 10% BaO, but with a catalyst of ThO₂-MnO (1:1) with K₂CO₃ precipitated on kieselguhr, the results were entirely ineffectual.  In the test at increased pressure, Al₂O₃-MoO₃ (7:3) was used as catalyst, and beside CO₂ some H₂O and a small amount of low boiling hydrocarbons were obtained.  From CO₂ at 20-30 atm. and 450°, the CO and only a small amount of hydrocarbons were obtained.

                 --------------.  See abs. 130, 131, 132, 1030, 1031.