3502.     TUTIYA, H.  Catalytic Decomposition of Carbon Monoxide.  I.  Iron as Catalyst.  Bull. Inst. Phys. Chem. Research (Tokyo), vol. 8, 1929, pp. 206-219; Sci. Papers Inst. Phys. Chem. Research (Tokyo), vol. 10, 1929, pp. 69-82; Chem. Abs., vol. 23, 1929, p. 3620.

        Decomposition rate of CO was measured in presence of C, 2 kinds of Fe wire, reduced Fe, and a mixture of Fe3C and C, and the carbons produced were studied with X-ray.  Conclusions:  (1) Fe functions not as a catalyst but as a catalyst donor, that is, as a supporter of autocatalytic decomposition of CO.  (2) When CO decomposes in presence of Fe, Fe3C forms first, and the 2 reactions, 3Fe+2CO=Fe3C+CO2 and 2CO=C+CO2, progress concurrently.  (3)  Fe3C has a remarkable catalyzing ability and plays a chief role in the decomposition of CO.  (4) C isolated from the catalytic decomposition not only has no catalyzing power but even hinders the catalytic effect of Fe3C.  (5) Fe3C becomes very densely packed with the C, which is isolated by decomposition, till it ceases completely to catalyze.  On this account Fe3C in the C is very difficult to remove.  This suggests a quality of C that is obtained catalytically by decomposition in presence of metal.  (6) X-carbide of U. Hofmann is Fe oxide.