Hydrodechlorination of chlorophenols at low temperature over highly defective Pd catalyst

AbstractHydrodechlorination of chlorophenols at lower temperature was investigated over Pd catalyst supported on mesoporous silica-carbon nanocomposites (Pd/MSC). Characterization by XRD, HRTEM and H2-TPD has shown Pd nanoparticles of 7nm with saw-edged GB at nanocrystal joining areas and edge steps. The catalyst exhibits high activity for hydrodechlorination of chlorophenols at 258–313K under normal hydrogen pressure. Using triethylamine as a probe combining with further theoretical calculation, it reveals that the HDC of chlorophenols at low temperature mainly occurs on Pd defects, meanwhile reactive H species plays a direct role when the reactant adsorbs on Pd via the formation of eithei π- or σ-complex