期刊
CATALYSTS
卷 11, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/catal11080946
关键词
post-plasma catalysis; non-thermal plasma; trichloroethylene; ozone decomposition; Ce-doped birnessite
资金
- European Program INTERREG V France-WallonieFlanders (FEDER) (DepollutAir)
- Chevreul institute [FR 2638]
- Ministere de l'Enseignement Superieur et de la Recherche
- Region Hauts-de-France
- university of Lille
- university of Ghent
- Fonds Europeen de Developpement Regional (FEDER)
- CNRS
- Region Nord Pas-de-Calais
- Ministere de l'Education Nationale de l'Enseignement Superieur et de la Recherche
The study investigated the removal of Trichloroethylene (TCE) using plasma-catalysis in different environmental conditions, utilizing a specific catalyst and ozone source to effectively degrade TCE and potential hazardous by-products. The plasma-assisted Ce0.01Mn-AT catalyst showed the best performance in dry air, minimizing the formation of chlorinated by-products.
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, Ce0.01Mn as a catalyst, calcined at 400 degrees C (Ce0.01Mn-400) or treated with nitric acid (Ce0.01Mn-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 (100 degrees C), of untreated TCE and of potential gaseous hazardous by-products from the NTP. The plasma-assisted Ce0.01Mn-AT catalyst presented the best CO2 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 Mn3+, 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. Ce0.01Mn-AT tested in moist air (RH = 15%) showed good stability as a function of time, indicating good water tolerance also.
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