DBD Combined with NiO/α-Mn3O4 Catalyzed the Degradation of Gaseous O-chlorotoluene
In order to improve the treatment effect of dielectric barrier discharge(DBD)on chlorinated volatile organic compounds(CVOCs),the NiO/α-Mn3O4 composite catalyst was prepared by co-precipitation method,and the gaseous o-chlorotoluene was catalyzed by DBD.The catalyst was characterized by X-ray diffraction(XRD),scanning electron micro-scope(SEM),and specific surface area and aperture analyzer(BET).The effects of gas flow rate,applied voltage,initial concentration,and relative humidity on the degradation efficiency and energy yield of o-chlorotoluene were investigated.The results showed that the NiO/α-Mn3O4 composite catalyst had the best catalytic performance when the molar ratio of Ni/Mn was 0.3 and the calcination temperature was 400 ℃.When the initial concentration of o-chlorotoluene was 140 mg/m3,the applied voltage was 8 kV,the gas flow rate was 0.9 m3/h and the relative humidity was 65％,the degradation efficiency and mineralization rate of o-chlorotoluene were increased by 33.9％and 13.1％,respectively,compared with that of DBD system alone.The concentration of O3 and NO2 decreased by 48.2 mg/m3 and 12.3 mg/m3 respectively,and the CO2 selectivity increased by 12％.
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