Effects Of Pretreatment On The Activated Carbon For Preparation High Dispersion Supported Palladium Catalysts

Activated carbons have some advantages as catalyst supports. They are relatively inexpensive, possess a high surface area, allow easy recovery of supported metal by simple combustion of the support, and show chemical inertness both in acidic and basic media. Moreover, the activated carbon has strong plasticity. It means that the properties of activated carbon can be reformed by kinds of pretreatments. The effect of pretreatment not only influences on the physical structure of activated carbon, but also introduces the functional ions or radicals on the surface of activated carbon to enhance the interaction between the surface and Pd metal. Changing the medium and condition of pretreatment can adjust the species and concentrate of the functional ions or radicals on the surface of activated carbon. The dispersion of Pd metal is determined by the species and concentrate of the functional ions or radicals.