2218.     ---------------.  [MAYER, M., AND ALTMAYER, V.]  [Synthesis of Methane With Calcium Hydride.]  Ber. deut. chem. Gesell., vol. 41, 1908, pp. 3074-3080; Chem. Abs., vol. 3, 1909, p. 64.

        CaH₂ forms CH₄ with CO, the maximum yield (65.6%) being at 500°.  The yield decreases as the temperature rises.  Other products of the reaction are C and CaC₂.  With CO₂ and CaH₂, the maximum yield of CH₄ is 60.24% at 500°.  Less CaC₂ is produced and traces of Ca formate and oxalate and considerable quantities of CaCO₂ also are formed.  Soot and CaH₂ at 270° give H₂ and N₂; above 270° CH₄ also is obtained.  The maximum yield is 40.68% at 500° or in a stream of H₂ 19%.  Some Ca₃N₂ also is produced.