779.    EICHNER, C., PERRIN, M., AND PRETTRE, M.  [Controlled Catalytic Combustion of Methane.]  Compt. Rend., vol. 218, 1944, pp. 621-623; Bull. Soc. Chim., 1944, p. 388; Chem. Abs., vol. 40, 1946, p. 1643.

     With a limited O2 supply, possible reactions are:  (1) 2CH4+O2=2CO+4H2; (2) CH4+202=CO2+2H2O; (3) 2CH4+302=2CO+4H2O; (4) CH4+O2=CO2+2H2; residual CH4 and reaction products may give (5) CH4+H2O=CO+3H2 and (6) CO+H2O=CO2+H2, 2 independent reactions.  A mixture of O2 and CH4 entering a catalytic column previously brought to constant temperature produces an initial rise followed by a drop in temperature; this indicates at least 2 steps to the reaction; only (5) is endothermic.  Equilibria (1) and (5) give very poor yields below 1,000.  Composition of gases after reaction indicates (4) does not occur.  Calculated and experimental results for equilibria (5) and (6) compare well at 725-870.  When equilibrium is not attained, analyses show (2) to be the preferred mechanism; an excess of H2O and CO2 is found in the gas mixture leaving the column; (3) sometimes occurs.