Reductive Dechlorination of 4-Chlorophenol in a Water-based Solvent Using Pd/SiO2 Catalysts Functionalized with Self-assembling Organophosphonic Acids

摘要

In this study, the surface properties of a silica-supported palladium catalyst (Pd/SiO2) were modified with several organophosphonic acids through simple self-assembly on a tetrahydrofuran interface. Reductive dechlorination of 4-chlorophenol was performed with the modified catalysts in a water-based solvent (water/ethanol, 39:1, v/v). All the modified catalysts promoted hydrodechlorination to produce phenol. This improvement may stem from the hydrophobic organic character imparted to the silica by the tethered phosphonic acid.