14.     AKHMEDLI, M. K. [Hydrogenation of Monocyclic Aromatic Hydrocarbons on a Cobalt Catalyst.] Jour. Gen. Chem. U. S. S. R., vol. 19, 1949, pp. 462-467 (in English, pp. 229-239); Chem. Abs., vol. 43, 1949, p. 6172.

   Hydrogenation of C₆H₆, PhMe, and C₆H₄Me₂ is not catalyzed by either asbestos. Al₂O₃, or Cr₂O₃ at 220°. On pure Co, prepared by reduction of the formate, C₆H₆ is completely hydrogenated at 172°. PhMe at 208°, C₆H₄Me₂ at 228°. Co deposited on carriers is more active than pure Co. Thus, with Co (61.54%), reduced from the formate, on asbestos, the temperatures of complete hydrogenation were, respectively, 105°, 100°, and 92°, with Co (68.75%) on Al₂O₃, 85°, 82°, and 41°, with Co (61.54%) on Cr₂O₃, 42°, 94°, and 139°. For the hydrogenation of C₆H₆, the most active catalysts are Cr₂O₃ and Co, and Al₂O₃ and Co; for C₆H₄Me₂, Al₂O₃ and Co is very distinctly more active than Cr₂O₃ and Co. The rate of hydrogenation falls in the order C₆H₆. PhMe, C₆H₄Me₂. Hydrogenation of all 6 atoms takes place in 1 stage, in agreement with the multiplet theory of catalysis. AL, J. See abs. 3043.