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Post-plasma catalysis for trichloroethylene abatement with ce-doped birnessite downstream dc corona discharge reactor

Catalysts, ISSN: 2073-4344, Vol: 11, Issue: 8
2021
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Article Description

Trichloroethylene (TCE) removal was investigated in a post-plasma catalysis (PPC) configuration in nearly dry air (RH = 0.7%) and moist air (RH = 15%), using, for non-thermal plasma (NTP), a 10-pin-to-plate negative DC corona discharge and, for PPC, CeMn as a catalyst, calcined at 400C (CeMn-400) or treated with nitric acid (CeMn-AT). One of the key points was to take advantage of the ozone emitted from NTP as a potential source of active oxygen species for further oxidation, at a very low temperature (100C), of untreated TCE and of potential gaseous hazardous by-products from the NTP. The plasma-assisted CeMn-AT catalyst presented the best CO yield in dry air, with minimization of the formation of gaseous chlorinated by-products. This result was attributed to the high level of oxygen vacancies with a higher amount of Mn, improved specific surface area and strong surface acidity. These features also allow the promotion of ozone decomposition efficiency. Both catalysts exhibited good stability towards chlorine. CeMn-AT tested in moist air (RH = 15%) showed good stability as a function of time, indicating good water tolerance also.

Bibliographic Details

Grêce Abdallah; Jean Marc Giraudon; Jean François Lamonier; Rim Bitar; Nathalie De Geyter; Rino Morent

MDPI AG

Chemical Engineering; Chemistry

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