2883.     ROGERS, W.  Reduction of Mixed Oxides.  Copper and Zinc Oxides.  Jour. Am. Chem. Soc., vol. 49, 1927, pp. 1432-1435; Chem. Abs., vol. 21, 1927, p. 2855.

        In a mixture with CuO, ZnO is completely reduced by H₂ at 300°, a temperature far below that necessary for ZnO alone.  A tentative explanation is offered.