Related Experiment Video
Updated: Aug 19, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
Published on: August 23, 2018
Structure relationship for catalytic dechlorination rate of dichlorobenzenes in water
Xinhua Xu1, Hongyi Zhou, Dahui Wang
1Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China. xhxu@hzcnc.com
Abstract:
Three isomers of dichlorobenzene (o-, m- and p-DCB) were dechlorinated by Pd/Fe catalyst in aqueous solutions through catalytic reduction. The dechlorination reaction took place on the surface site of the catalyst via a pseudo-first-order kinetics, and resulted in benzene as the final reduction product. The rate constants of the reductive dechlorination for the three dichlorobenzenes (DCBs) in the presence of Pd/Fe as a catalyst were measured experimentally. In all cases, the reaction rate constants were found to increase with the decrease in the Gibbs free energy of the formation of DCBs. The reaction rate constant for o-, m- and p-DCBs in the presence of 0.020% (w/w) Pd/Fe at 25 degrees C was determined to be 0.0213, 0.0223, and 0.0254 min(-1), respectively. While the activation energy of each dechlorination reaction was measured to be 102.5, 96.6 and 80.0 kJ mol(-1) for o-, m- and p-DCBs, respectively. The results demonstrated that p-DCBs were reduced more easily than o- or m-DCBs, and the order of the tendency of the dechlorination was p-DCB>m-DCB>o-DCB. The presented data show the catalytic reduction using Pd/Fe as a catalyst is a fast and easy approach for the dechlorination of DCBs.
More Related Videos
Related Concept Videos
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene
Hydrolysis of Chlorobenzene to Phenol: Dow Process
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
SN2 Reaction: Kinetics
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a reaction.
Catalysis
Catalysis

