2527.     OLMER, F.  [Reduction of Iron Oxides by Carbon Monoxide in the Presence of Certain Natural Impurities.]  Compt. rend., vol. 206, 1938, pp. 353-355; Chem. Abs., vol. 32, 1938, p. 2447.

        Although CO is unstable at 20°-1,000°, the velocity of the reaction 2CO=CO₂+C is very small in the absence of a catalyst.  In the presence of Fe₂O₃ above 350°, it occurs rapidly either alone or accompanied by reduction of the Fe₂O₃, the velocity being proportional to the mass of the catalyst.  Fe alone acts similarly.  Similar experiments with Fe₂O₃, containing a phosphate or aluminate show that P₂O₅ and Al₂O₃ hinder the catalytic action of the Fe (or Fe₂O₃).