Dechlorination of chloroaromatics by electrocatalytic reduction over palladium-loaded carbon felt at room temperature

The selective dechlorination of various chloroaromatics in water-MeOH medium containing trifluoroacetic acid and tetraalkylammonium salts was successfully performed over Pd-loaded carbon felt cathode at room temperature. The reactivities of 2,4-dichlorophenyl derivatives varied in the order: 2,4 dic...

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Bibliographic Details
Published in:Chemosphere (Oxford) 1999-11, Vol.39 (11), p.1819-1831
Main Authors: Tsyganok, Andrey I., Yamanaka, Ichiro, Otsuka, Kiyoshi
Format: Article
Language:English
Subjects:
Applied sciences
carbon felt
Chemistry
chloroaromatics
electrocatalysis
Electrochemistry
Exact sciences and technology
General and physical chemistry
General purification processes
Kinetics and mechanism of reactions
palladium
Pollution
reductive dehalogenation
Wastewaters
Water treatment and pollution
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Summary:The selective dechlorination of various chloroaromatics in water-MeOH medium containing trifluoroacetic acid and tetraalkylammonium salts was successfully performed over Pd-loaded carbon felt cathode at room temperature. The reactivities of 2,4-dichlorophenyl derivatives varied in the order: 2,4 dichlorotoluene < 2,4-dichlorophenol ≤ 2,4-dichloroanisole ≤ 2,4-dichlorobenzoic acid < 2,4-dichlorophenoxyacetic acid < 2,4-dichlorophenethyl alcohol. For 2,4-dihaloanisoles, the ease of reductive cleavage of CX (X=halogen) bond was as follows: F ⪡ Cl < Br. For monochlorobiphenyls, the dechlorination and product recovery efficiencies were remarkably affected by tetraalkylammonium cations of different size. The reaction scheme for the selective electrocatalytic dehalogenation of haloaromatics over Pd-loaded felt cathode was proposed.
ISSN:0045-6535
1879-1298
DOI:10.1016/S0045-6535(99)00075-2