Catalytic dechlorination of gas-phase perchloroethylene under mixed redox conditions

Özer Orbay, Song Gao, Brian Barbaris, Erik Rupp, Avelino E Saez, Robert G Arnold, Eric Betterton

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The validity of a new method to destroy gas-phase perchloroethylene (PCE) is demonstrated at bench scale using a fixed-bed reactor that contains a Pt/Rh catalyst. Hydrogen and oxygen were simultaneously fed to the reactor together with PCE. The conversion efficiencies of PCE were sensitive to H2/O2 ratio and reactor temperature. When the temperature was ≥400 °C and H2/O2 was ≥2.15, PCE conversion efficiency was maintained at ≥90%. No catalyst deactivation was observed for over 2 years, using only mild, convenient regeneration procedures. It is likely that PCE reduction steps precede oxidation reactions and that the importance of oxidation lies in its elimination of intermediates that would otherwise lead to catalyst poisoning. In practice, this catalytic dechlorination method holds potential for low-cost, large-scale field operation.

Original languageEnglish (US)
Pages (from-to)43-52
Number of pages10
JournalApplied Catalysis B: Environmental
Volume79
Issue number1
DOIs
StatePublished - Feb 21 2008

Fingerprint

Tetrachloroethylene
Dechlorination
tetrachloroethylene
redox conditions
dechlorination
Conversion efficiency
Gases
Catalyst poisoning
Oxidation
Catalyst deactivation
gas
catalyst
Hydrogen
Temperature
Catalysts
Oxygen
oxidation
Costs
poisoning
regeneration

Keywords

  • Catalytic dechlorination
  • Oxidation
  • PCE destruction
  • Redox conditions
  • Reduction

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Environmental Chemistry

Cite this

Catalytic dechlorination of gas-phase perchloroethylene under mixed redox conditions. / Orbay, Özer; Gao, Song; Barbaris, Brian; Rupp, Erik; Saez, Avelino E; Arnold, Robert G; Betterton, Eric.

In: Applied Catalysis B: Environmental, Vol. 79, No. 1, 21.02.2008, p. 43-52.

Research output: Contribution to journalArticle

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AU - Arnold, Robert G

AU - Betterton, Eric

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AB - The validity of a new method to destroy gas-phase perchloroethylene (PCE) is demonstrated at bench scale using a fixed-bed reactor that contains a Pt/Rh catalyst. Hydrogen and oxygen were simultaneously fed to the reactor together with PCE. The conversion efficiencies of PCE were sensitive to H2/O2 ratio and reactor temperature. When the temperature was ≥400 °C and H2/O2 was ≥2.15, PCE conversion efficiency was maintained at ≥90%. No catalyst deactivation was observed for over 2 years, using only mild, convenient regeneration procedures. It is likely that PCE reduction steps precede oxidation reactions and that the importance of oxidation lies in its elimination of intermediates that would otherwise lead to catalyst poisoning. In practice, this catalytic dechlorination method holds potential for low-cost, large-scale field operation.

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