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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.