Removal of toluene with a reverse flow non-thermal plasma-catalytic reaction system

Combined with NTP, catalysis and reverse-flow technology, the effects on the temperature rise (∆T), specific energy density (SED) and energy efficiency (EE) of the system were investigated under the influence of different reaction system (grounding mode, wall thickness) and power supply (voltage and frequency). The effects of toluene removal (η) and products were also analyzed. The results showed that the reverse flow non-thermal plasma-catalytic reaction system had the best η and EE, which was 3.76g/(kW•h). The differences in ∆T under three grounding conditions were not significant when voltage was increased continuously. The concentrations of O3, η, SED and EE were the highest when the aluminum foil was grounded. The ∆T, η, SED and EE decreased with the increase of wall thickness. When three technologies were combined, NO2 was less generated, fewer types of organic by-products were produced, the CO2 selectivity was high and the toluene mineralization rate were highest. When the frequency was fixed, the ∆T, η, SED were positively proportional to the voltage as voltage increased, while the EE showed the opposite correlation with voltage. When aluminum foil was grounded, the ∆T achieved 110.7℃ and the η was 74.05%. The concentration of the byproduct (O3) increased in the beginning, then decreased, and finally became 0mg/m3. When the frequency changed while the voltage was fixed, the change rules were the same. © 2019, Editorial Board of China Environmental Science. All right reserved.