2322.     ---------------.  [MORIKAWA, K., BENEDICT, W. S., AND TAYLOR, H. S.]  [Activation of Specific Bonds in Complex Molecules at Catalytic Surfaces.  II.  Carbon-Hydrogen and Carbon-Carbon Bonds in Ethane and Ethane-d.  Jour. Am. Chem. Soc., vol. 58, 1936, pp. 1795-1800; Chem. Abs., vol. 30, 1936, p. 7435.

        C2H6 and D2, heated in contact with a Ni catalyst, undergo an exchange reaction at 100-130, and yield mixed methanes at 160-300.  The CH4 reaction was followed by measuring the infrared absorption and by volume changes in the gas mixture.  H2 is preferentially adsorbed on the catalyst and tends to inhibit CH4 formation.  At low H2 concentrations, the side reactions 2C2H6→C+3CH4 and C+2H2→CH4 become predominant.  The activation energy of formation of CH4 from C2H2 and H2 is approximately 43 kg.-cal., and that of CD4 is approximately 5 kg.-cal. higher.  These reactions are explained in terms of a dissociative adsorption theory.  More energy is required to activate the C-C bond than the C-H bond.  C2D6 was prepared by 2 treatments of C2H6 with pure D2 at 138 for 2-3 hr.

        MORITA, K.  See abs. 1681, 1682.

        MORLET, E.  See abs. 2094a.