Electrolytic reduction of trichloroethylene and chloroform at a Pt- or Pd-coated ceramic cathode

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Abstract

Trichloroethylene (TCE) and chloroform (CF) were electrolytically dechlorinated in a two-compartment cell in which the working electrode (cathode) consisted of an Ebonex ceramic sheet plated with platinum (Pt) or palladium (Pd). The halogenated targets were not reduced using a cathode of untreated Ebonex. Under typical experimental conditions (e.g., cathode potentials Ec = -0.3 V to -1.4 V vs SHE, pH 7.0), transformations were first order in TCE and CF. Reaction kinetics were mass transport limited at Ec < -1.4 V. Transport-limited rate constants were 0.45 cm min-1 for TCE reduction and 0.42 cm min-1 for CF. The primary products of CF reduction were methane and hydrochloric acid. For TCE reduction, major products were ethane, ethylene and hydrochloric acid. Carbon and chlorine mass balances were within 5-10%. Current efficiencies ranged from nearly 100% at Ec = -0.5 V (both reactants) to 24.4% for TCE and 16.6% for CF at Ec = -l.4 V. Rate constants for TCE and CF transformations were inversely related to pH in the range 2 < pH < 11. Pt-Ebonex resisted sulfate and chloride poisoning. The Pd-Ebonex electrode quickly lost activity (50% loss in 5-10 min) in 0.1 M K2SO4 electrolyte (cathode potential, Ec = -1.15to -1.4 V vs SHE).

Original languageEnglish (US)
Pages (from-to)161-169
Number of pages9
JournalJournal of Applied Electrochemistry
Volume33
Issue number2
DOIs
StatePublished - Feb 2003

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Electrolytic reduction
Trichloroethylene
Palladium
Chloroform
Chlorine compounds
Platinum
Cathodes
Hydrochloric Acid
Hydrochloric acid
Rate constants
Electrodes
Ethane
Chlorine
Methane
Reaction kinetics
Electrolytes
Sulfates
Chlorides
Ethylene
Carbon

Keywords

  • Catalyst poisoning
  • Chloroform
  • Ebonex
  • Electrochemical reduction
  • Electrolytic dehalogenation
  • Palladium
  • Platinum
  • Trichloroethylene

ASJC Scopus subject areas

  • Electrochemistry

Cite this

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title = "Electrolytic reduction of trichloroethylene and chloroform at a Pt- or Pd-coated ceramic cathode",
abstract = "Trichloroethylene (TCE) and chloroform (CF) were electrolytically dechlorinated in a two-compartment cell in which the working electrode (cathode) consisted of an Ebonex ceramic sheet plated with platinum (Pt) or palladium (Pd). The halogenated targets were not reduced using a cathode of untreated Ebonex. Under typical experimental conditions (e.g., cathode potentials Ec = -0.3 V to -1.4 V vs SHE, pH 7.0), transformations were first order in TCE and CF. Reaction kinetics were mass transport limited at Ec < -1.4 V. Transport-limited rate constants were 0.45 cm min-1 for TCE reduction and 0.42 cm min-1 for CF. The primary products of CF reduction were methane and hydrochloric acid. For TCE reduction, major products were ethane, ethylene and hydrochloric acid. Carbon and chlorine mass balances were within 5-10{\%}. Current efficiencies ranged from nearly 100{\%} at Ec = -0.5 V (both reactants) to 24.4{\%} for TCE and 16.6{\%} for CF at Ec = -l.4 V. Rate constants for TCE and CF transformations were inversely related to pH in the range 2 < pH < 11. Pt-Ebonex resisted sulfate and chloride poisoning. The Pd-Ebonex electrode quickly lost activity (50{\%} loss in 5-10 min) in 0.1 M K2SO4 electrolyte (cathode potential, Ec = -1.15to -1.4 V vs SHE).",
keywords = "Catalyst poisoning, Chloroform, Ebonex, Electrochemical reduction, Electrolytic dehalogenation, Palladium, Platinum, Trichloroethylene",
author = "G. Chen and Eric Betterton and Arnold, {Robert G} and Ela, {Wendell P}",
year = "2003",
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language = "English (US)",
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TY - JOUR

T1 - Electrolytic reduction of trichloroethylene and chloroform at a Pt- or Pd-coated ceramic cathode

AU - Chen, G.

AU - Betterton, Eric

AU - Arnold, Robert G

AU - Ela, Wendell P

PY - 2003/2

Y1 - 2003/2

N2 - Trichloroethylene (TCE) and chloroform (CF) were electrolytically dechlorinated in a two-compartment cell in which the working electrode (cathode) consisted of an Ebonex ceramic sheet plated with platinum (Pt) or palladium (Pd). The halogenated targets were not reduced using a cathode of untreated Ebonex. Under typical experimental conditions (e.g., cathode potentials Ec = -0.3 V to -1.4 V vs SHE, pH 7.0), transformations were first order in TCE and CF. Reaction kinetics were mass transport limited at Ec < -1.4 V. Transport-limited rate constants were 0.45 cm min-1 for TCE reduction and 0.42 cm min-1 for CF. The primary products of CF reduction were methane and hydrochloric acid. For TCE reduction, major products were ethane, ethylene and hydrochloric acid. Carbon and chlorine mass balances were within 5-10%. Current efficiencies ranged from nearly 100% at Ec = -0.5 V (both reactants) to 24.4% for TCE and 16.6% for CF at Ec = -l.4 V. Rate constants for TCE and CF transformations were inversely related to pH in the range 2 < pH < 11. Pt-Ebonex resisted sulfate and chloride poisoning. The Pd-Ebonex electrode quickly lost activity (50% loss in 5-10 min) in 0.1 M K2SO4 electrolyte (cathode potential, Ec = -1.15to -1.4 V vs SHE).

AB - Trichloroethylene (TCE) and chloroform (CF) were electrolytically dechlorinated in a two-compartment cell in which the working electrode (cathode) consisted of an Ebonex ceramic sheet plated with platinum (Pt) or palladium (Pd). The halogenated targets were not reduced using a cathode of untreated Ebonex. Under typical experimental conditions (e.g., cathode potentials Ec = -0.3 V to -1.4 V vs SHE, pH 7.0), transformations were first order in TCE and CF. Reaction kinetics were mass transport limited at Ec < -1.4 V. Transport-limited rate constants were 0.45 cm min-1 for TCE reduction and 0.42 cm min-1 for CF. The primary products of CF reduction were methane and hydrochloric acid. For TCE reduction, major products were ethane, ethylene and hydrochloric acid. Carbon and chlorine mass balances were within 5-10%. Current efficiencies ranged from nearly 100% at Ec = -0.5 V (both reactants) to 24.4% for TCE and 16.6% for CF at Ec = -l.4 V. Rate constants for TCE and CF transformations were inversely related to pH in the range 2 < pH < 11. Pt-Ebonex resisted sulfate and chloride poisoning. The Pd-Ebonex electrode quickly lost activity (50% loss in 5-10 min) in 0.1 M K2SO4 electrolyte (cathode potential, Ec = -1.15to -1.4 V vs SHE).

KW - Catalyst poisoning

KW - Chloroform

KW - Ebonex

KW - Electrochemical reduction

KW - Electrolytic dehalogenation

KW - Palladium

KW - Platinum

KW - Trichloroethylene

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DO - 10.1023/A:1024076419515

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EP - 169

JO - Journal of Applied Electrochemistry

JF - Journal of Applied Electrochemistry

SN - 0021-891X

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