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.