Reductive and oxidative destruction of chlorinated hydrocarbons in gas-phase catalytic reactors: Packed-beds and modified fuel cells

Xiumin Ju, A. Eduardo Sáez, Wendell P. Ela, Robert G. Arnold, Eric A. Betterton, Matthew Wallen, Kate Candillo, Brian Barbaris, Ozer Orbay

Research output: Contribution to journalConference article

Abstract

The thermochemical destruction of TCE, a major contaminant of soil and groundwater, was studied using a packed-bed reactor to establish the ranges of temperature and H2/O2 ratio at which oxidative destruction and reductive chlorination occur. At H2/O2 ratios of 2:1 and 3:1, TCE conversion increased with temperature, reaching 100% at ≥ 150°C. When excess hydrogen was present, the main reaction product was ethane. These results showed that the reduction reaction is more efficient for TCE conversion at lower temperatures (50°-200°C) than the oxidation reaction. There was clear evidence of a change in conversion mechanism as the temperature increased; at low temperatures, TCE was converted primarily to ethane. At higher temperatures, ethane yield decreased while C02 production increased. The effluent flow rate and cell current increased as the potential decreased although the influent flow rate was constant. Performance of the modified fuel cell reactor was also evaluated in the presence of 21% oxygen in the influent gas stream. An inhibition of TCE conversion was expected in the presence of oxygen due to a lower availability of hydrogen caused by reduction of oxygen to water. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).

Original languageEnglish (US)
Pages (from-to)452-457
Number of pages6
JournalACS, Division of Environmental Chemistry - Preprints of Extended Abstracts
Volume44
Issue number2
StatePublished - Dec 1 2004
Event228th ACS National Meeting - Philadelphia, PA, United States
Duration: Aug 22 2004Aug 26 2004

ASJC Scopus subject areas

  • Energy(all)

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