PATENTS

      1620.  IKAWA, K. (Mitsui Kôzan K. K.).  [Catalyzers.]  Japanese Patent 91,310. May 6, 1931.  Chem. Abs., vol. 26, 1932. p. 1730.

            Small grains are made from a mixture of 1 or more powdered metallic oxides, metals, and oxidizing agents, with or without diluents.  By burning of the grains after applying heat, rough and hard catalyzers are prepared.  For example, dried grains prepared from Fe₂O₃, Zn, Fe, Mg, BaO₂, and K₂Cr₂O₇ are heated in a muffle furnace at 200º-300º.  After part of the grains are ignited, combustion continues of itself to produce black coarse grains, which are used for the manufacture of H₂ from CO and H₂O.  Grains prepared from a mixture of ZnO, Zn, (NH₄)₂Cr₂O₇, and feldspar (containing no Fe) give by the same treatment a grayish white catalyzer, which is used in the synthesis of MeOH.