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Return to Abstracts of Literature 1500-1749
1606. JAEGER, A., AND WINKELMANN, H. [Reduction of Carbon Monoxide Under Ordinary Pressure.] Ges. Abhandl. Kenntnis Kohle, vol. 7, 1925, pp. 55-62; Chem. Abs., vol. 21, 1927, p. 2550.
Yields of CH4 and of mixed oxides of C obtained by passing a mixture of 26% of CO and 67% of H2 over a Ni pumice catalyst are, respectively, 12 and 12% at 220°, 54 and 7% at 245°, and 66 and 6% at 250°. The optimum temperature for CH4 formation lies in a narrow zone at 250°. A mixed Cu-Ni catalyst yielded only 6% of CH4; no C2H4 could be detected when a Pd catalyst was used. Contrary to the results of French Patent 519,649, no CH2O is formed when a mixture of CO, HCl, and H2 is passed over CuCl, Cu, Fe, or Ni at 200°-300°; it is produced in considerable amounts, however, when formic acid vapor mixed with H2 is passed over metals at lower temperatures, over indifferent substances at higher temperatures, or through an empty glass tube at 700°-750°. CO and steam yield small quantities of formic acid when passed over hydrated SiO2 at 320°; at 450° in a quartz tube about 1.5% of the CO is converted into CH2O. This yield decreases with rising temperature and increasing streaming velocities (100 cm.3 per min.), and no CH2O is formed at all when Cu or Ni pumice catalysts are used or when the steam is replaced by H2. H2 free from H2S or prepared by dehydrogenation of tetralin (tetrahydronaphthalene) does not reduce CO to CH2O at 400°. CH2O likewise is not obtained by reducing the compound K3Fe(CN)5CO with H2.