3560.     VIGNON, L.  [Action of Water Vapor on Carbon in the Presence of Lime.]  Compt. rend., vol. 152, 1911, pp. 871-874; Chem. Abs., vol. 5, 1911, p. 2044.

        If water vapor is allowed to act upon a mixture of C and CaO at 600°-800°, H₂, CH₄, and some C₂H₄ are formed besides CO and CaCO₃.  The mixture of CaO and C decomposes H₂O more rapidly and at lower temperature than C alone.  Much H₂O and long heating reduce the amount of CH₄ as the latter is decomposed by the H₂O to CO and H₂.