3098.     SCHMIDT, J., AND NEUMANN, B.  [Equilibrium:  Methane-Carbon Dioxide and Carbon Monoxide-Hydrogen.]  Ztschr. Elektrochem., vol. 38, 1932, pp. 925-934; Chem. Abs., vol. 27, 1933, p. 1260.

        Equilibrium CH₄+CO₂=2 CO+H₂ was investigated experimentally, 500°-800°, and the equilibrium constants are compared with those calculated from the free energy data.  Above 600, there is agreement, but below 600° the observed CH₄ transformation is larger than that calculated.  This is due to 2 by reactions:  H₂+CO₂=CO+H₂O followed by H₂O+CH₄=CO+3 H₂.  The equilibrium was approached from the CH₄, CO₂ side, and the reaction proceeded without separation of C.  The catalyst used was reduced Ni supported on SiO₂ gel.  As an intermediate step in the primary reaction, NiO apparently is formed.