3613.     WATANABE, T.  Poisoning Effect of Certain Substances on the Iron Catalyzer in the Decomposition of Carbon Monoxide.  Bull. Inst. Phys. Chem. Research (Tokyo), vol. 7, 1928, pp. 1078-1087 (abs. I, 102-103); Chem. Abs., vol. 23, 1929, p. 1560.

        CO from formic acid is decomposed in an Fe pipe on Fe gauze, and the gas is analyzed.  The effects of H₂O, N₂, H₂, CH₄, C₂H₂, C₆H₆, C₁₀H₈, H₂S and C₄H₄S on the catalysis are investigated.  N₂, CH₄, C₆H₆ and C₂H₂ have no effect, except that C₂H₂ liberates C.  H₂O gives some CO₂, H₂, and CH₄.  H₂ gives CH₄.  Naphthalene causes a progressive drop in the catalysis efficiency, but the fall is temporary; by passing pure CO over the poisoned catalyst, the initial efficiency is recovered.  S compounds kill the catalyst.