1144.    GARNER, W. E., AND KINGMAN, F. E. T.  Adsorption of Hydrogen and Carbon Monoxide on Oxide Catalysts.  Nature, vol. 126, 1930, p. 352; Chem. Abs., vol. 24, 1930, p. 5567.

       H₂ or CO adsorbed at room temperature on ZnO-Cr₂O₃ catalysts was given off at 100°-120° but after 20-30 min. was readsorbed on the surface of the catalysts.  On raising the temperature further, no gas was given off up to 350°, when H₂O or CO₂ was liberated.  Physically adsorbed gas must leave the surface before it can chemically combine with metallic oxides.