3372.     TERNISIEN, J.  [Catalytic Oxidation and Influence of Catalyst Surface.]  Chim. et ind., vol. 58, 1947, pp. 234-237.

        Because of the ease with which H₂ is more or less adsorbed between 300° and 700° C., it was used in the study of surface.  Adsorption by catalyst, with or without support is compared.  Calculation using the Brunauer-Emmett-Teller equation showed the supported catalyst to be far superior to the nonsupported.  The active surface of the supported catalyst lost 5% of its efficiency at 500° C., 26% at 600°, and 75% at 650°.  After several hours use at the last temperature it lost 39%.  The dimensions of surface for the same quantity of metal catalyst deposited are determined by comparing them to a standard surface magnified and photographed by the electron microscope.