830.    ---------------.  [EMMETT, P. H., AND HARKNESS, R. W.]  Catalytic Interconversion of o-p Hydrogen Over Iron, Platinum and Nickel Catalysts.  Jour. Am. Chem. Soc., vol. 57, 1935, pp. 1624-1631; Chem. Abs., vol. 30, 1936, p. 369.

      The o-p interconversion of H2 over Fe-synthetic-NH3 catalyst was studied as a function of the temperature, pressure, time of contact, and presence of various poisons.  Both types of activated adsorption of H2 on Fe are poisons for the conversion of o-p-H2 at liquid-air temperature.  The low-temperature of o-p conversion over Ni and Pt is also inhibited by the activated adsorption of H2.