PATENTS

      20.            AMMONIA CASLE S. A. [Catalysts.] French Patent 797,934, May 6, 1936.  Chem. Abs., vol. 30, 1936. p. 7294.

One hundred parts by weight of catalytic substance or the corresponding amount of their constituents is intimately mixed with 10-50 parts, by weight of a mixture of CuO and CU₂O and the mixture is heated to a temperature at which a commencement of fusion of the oxides takes place.  The catalytic substance may be a mixture of MBO, ZaO, and Cr₂O₃.