ChemInform Abstract: Surface‐Characterized Dispersed Metal Catalysts

Abstract

The Single Turnover (STO) procedure has been used to characterize the surface of a number of different dispersed metal catalysts. With this technique it is possible to identify and measure the relative densities of five different types of surface sites. This technique has been used to evaluate those factors in catalyst preparation and pretreatment which influence catalyst activity as well as the nature of the solvent effect and some specific types of metal support interactions. The use of these STO characterized catalysts in other reactions has made it possible to identify the types of sites on the metal surface responsible for mono- and polydeuterium exchange on alkanes and the dehydrogenation and hydrogenolysis of cyclohexane. This later work provides a direct correlation between single crystal studies and reactions run on dispersed metal catalysts. A combination of the STO technique with the apopinene catalyst characterization of Smith has provided a method by which it is possible to determine the relative rates at which these different types of sites react. 32 refs., 20 figs., 3 tabs.