3248.     SRIKANTAN, B. S.  Reactions at the Surface of Hot Metallic Filaments.  I.  The Reaction CO2+H2→H2O+CO on Platinum.  Jour. Indian Chem. Soc., vol. 6, 1929, pp. 931-947; Chem. Abs., vol. 24, 1930, p. 2036.

        Reaction between CO₂ and H₂ on a Pt wire at about 1,000° is unimolecular except for the initial fall in reaction velocity, which is due to poisoning of the more active centers by the CO formed.  Poisoning was eliminated by prior heating in vacuo.  The rate of reaction was not influenced by dilution of the gases with N₂.  The nature and treatment of the surface of the wire are important; thus, a rough surface is more active than a smooth one.  The energy of activation is 38,000 cal.