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 1639.    JORIS, G. G., AND TAYLOR, H. S.  Exchange Reactions of Nitrogen Isotopes on Iron and Tungsten Surfaces.  Jour. Chem. Phys., vol. 7, 1939, pp. 893-898; Chem. Abs., vol. 33, 1939, p. 9128.

       Activities of Fe synthetic-NH₃ catalysts and of W filaments in promoting the reaction between N₂¹⁵ and N₂¹⁴ were studied from room temperature to 725° with FE and to 900° on W.  In contrast to the exchange reaction of molecular H₂ isotopes, the exchange reaction of N₂ molecules is very slow, being first measurable above 450°.  The exchange is accelerated by the presence of H₂.  The exchange involves, as the slow process, either the rupture of valence bonds of adsorbed molecular N₂ on the surface or migration of N atoms over the surface, and that H₂ accelerates such processes.  The temperature coefficient of exchange in a N₂:3H₂ mixture is about 50 kcal.  The data suggest that measurements of the velocity of N adsorption at about 400° on synthetic-NH₃ catalysts are measurements of true activated adsorption.

        JOSEPH, T. L.  See abs. 3370.

        JOUBERT, D. B.  See abs. 1743.