2159.     MAIER, C. G.  Reduction of Cuprous Oxide by Carbon Monoxide.  Bureau of Mines Rept. of Investigations 2926, 1929, 7 pp.; Chem. Abs., vol. 23, 1929, p. 3621.

        Presence of less than 0.1 mm. CO pressure in an atmosphere of otherwise pure CO₂ will act reducingly toward Cu₂O below 1,064°.  The equilibrium changes with temperature in such a way that below 900° decreasing quantities of CO suffice to reduce Cu₂O.  At temperatures near and above the melting point of Cu, a partial pressure of 7.6 mm. CO in otherwise pure CO₂ should reduce the dissolved CuO to 0.008%.