3445.    ---------------.  [TROESCH, A.]  [Kinetic Equations for Adsorption and Desorption.]  Jour. chim. phys., vol. 47, 1950, pp. 145-147; Chem. Abs., vol. 44, 1950, p. 8194.

        Adsorption of CH4 on a Ni-Al-Mn-kieselguhr catalyst (abs. 2608) obeys a simple Langmuir rate equation in which desorption is neglected and the rate of adsorption is proportional to the fraction of the surface not covered by adsorbate.  The rate of adsorption of H2 does not follow such an equation but indicates that the surface is heterogeneous.  Desorption of CH4 from the Ni surface at 170 and a constant pressure of 10-4 mm. cannot be measured because the evolved gas is all H2.  The rate of H2 desorption does not follow the simple Langmuir equation and again indicates surface heterogeneity.

        TROITSKAYA, F. B.  See abs. 3764, 3766.