Liquid-phase catalytic hydrodechlorination of 4-chlorophenol over Pd/CNTs

5% Pd/CNTs was synthesized by chemical impregnation method using multi-walled carbon nanotubes(CNTs) which was acidified by concentrated nitric acid as starting materials, PdCl2 as precursor and formaldehyde as reducing agent. The catalyst was characterized by means of ICP, XRD, BET and TEM. The results showed that 5% Palladium nanoparticles were successfully loaded on the outer wall of the CNTs tubes and the mean diameter of the Pd nanoparticles was 4.30nm. The performance of the Pd/CNTs catalysts in the liquid-phase catalytic hydrodechlorination(HDC)of 4-chlorphenol(4-CP)under mild conditions was also investigated. Effects of reaction temperature, catalyst and NaOH dosage, substrate concentration, as well as the reaction kinetics were studied. The optimized operating parameters were obtained as reaction temperature 40℃, catalyst dosage 20mg, and Cl-:OH- =1:1.1(molar ratio). The reaction kinetics could be described by a zero-order kinetics model. The activation energy Ea and pre-exponential factor A were estimated as 40.12kJ/mol, and 1.66×107mol/(L·min), respectively. © 2017, Chemical Industry Press. All right reserved.