2003.     KUBOKAWA, M.  Activated Adsorption of Methane on Reduced Nickel.  Proc. Imper. Acad. (Tokyo), vol. 14, 1938, p. 61-66; Rev. Phys. Chem. Japan, vol. 12, 1938, pp. 157-167; Chem. Abs., vol. 32, 1938, p. 5678.

        Adsorption of CH₄ on Ni was studied at pressures 5-10^-3 mm.  Between –112° and 20° adsorption is due to van der Waals’ forces.  The heat of adsorption is 1 kg.-cal. per mol.  Above 40°, activated adsorption takes place.  Isotherms were obtained up to 250°.  The mechanism is assumed to be:  CH₄→CH₃+H→CH₂+2H→CH+3H→C+4H.  The desorption process consists in the formation of CH₄ by the hydrogenation of CH radicals.  The heat of activated adsorption of CH₄ on Ni is calculated to be 12 kg.-cal. per mol. if the difference between the 0-point energy of the CH and the CD bond is taken as 0.