3446.    TROPSCH, H.  [Synthesis and Decomposition of Formates.]  Ann. chim. phys., vol. 15, No. 9, 1921, pp. 42-60.

        Investigation of CaO as a catalyst for reactions in water gas mixtures was extended, and a study was made of the synthesis and decomposition of formates.  As regards the mechanism of CH₄ synthesis, it is assumed that at temperatures below the decomposition of CaCO₃ (900°) water gas reacts with CaO to give calcium formate.  CaO+2 CO+H₂O=Ca(CHO₂)₂.  The formate in the presence of an excess of lime then reacts to give CH₄ and CaCO₃.  2 Ca(CHO₂)₂+CaO=3 CaCO₃+CH₄.