3001.     SABATIER, P., AND SENDERENS, J. B.  [Direct Hydrogenation of Oxides of Carbon in Presence of Various Finely Divided Metals.]  Compt. rend., vol. 134, 1902, pp. 689-691; Bull. soc. chim., vol. 29, III, 1903, p. 294; Jour. Chem. Soc., vol. 82, II, 1902, p. 317.

        Although CO is converted completely into CH4 by H2 in the presence of finely divided Ni at 250°, at 280° another reaction becomes obvious, the formation of CO2 and finely divided C.  Thus, at 280°, CO and H2 (1:3) yield a gaseous mixture, which consists of CO2, 10.5; CH4, 67.9; H2, 21.6%; whereas, when equal volumes of CO and H2 (water gas) are used, 52.5% CO2, 39.8 CH4, 7.1 H2, and 0.6 CO are formed.  Co resembles Ni in its action on mixtures of CO2 and H2 and on CO and H2 but is less energetic; the reduction of CO2 begins at 300° and is rapid at 360°-400°; no formation of C or CO and no oxidation of the metal occur.  CO begins to be reduced at 270°, but at 300° the formation of CO2 and C also is noticeable; the latter reaction plays a more prominent part the higher the temperature and the greater the proportion of CO in the mixture of this gas and H2, that is led over the Co.  Pt sponge and Pt black, Pd sponge and reduced Fe do not bring about reduction of the oxides of C.  Reduced Cu converts a mixture of H2 and CO2 into CO and H2O at 430°.