Project Summary (1995-2000)

This project will investigate the use of a bimetallic system, palladized-iron, for the dehalogenation of halogenated organic compounds (HOC). Elemental palladium (Pd) is a well-known catalyst of dechlorination reactions and in theory a surface reaction between the palladized iron (Pd/Fe) and the halogenated organic compound that diffuses to the surface of the Pd/Fe may prove to be effective. The extent of the Pd deposited on this type of surface depends on the nature of the oxide layers and the porosity of the surface. The nature of the surface of the Pd/Fe is, therefore, of importance. Pixe, micro-PIXE and X-Ray Photoelectronc Spectroscopy (high energy ion beams) will be used to examine the species and determine the nature of the bimetallic surface. Previous work has indicated that the iron should be in the zero valence state and that these materials rapidly deactivate during dehalogenation reactions. It was also found that the formation of oxide layers of iron deactivated the surface. Either the prevention of the formation of these oxide layers or their removal is essential if the Pd/Fe is to be used effectively over long periods of time.