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 1358.    HARKNESS, R. W., AND EMMETT, P. H.  Conversion of Ortho to Para Hydrogen Over Promoted Iron Synthetic Ammonia Catalysts at –190°.  Jour. Am. Chem. Soc., vol. 55, 1933, pp. 3496-3497; Chem. Abs., vol. 27, 1933, p. 4730.

       Adsorption of H₂ by a promoted Fe synthetic NH₃ catalyst inhibits markedly the activity of the latter toward the o-p-conversion at –190°; the results indicate definitely that the activated adsorption of H₂ at the higher temperatures is primarily a surface adsorption and not a solution within the Fe sample.  Permitting the promoted catalyst to take up O₂ between room temperature and 450° almost eliminates its high-temperature activity toward the o-p-conversion but only slightly impairs the activity toward the conversion at –190°.