A comparison study of toluene removal by two-stage DBD-catalyst systems loading with MnOx , CeMnOx , and CoMnOx

摘要

This paper studies the toluene removal by a two-stage dielectric barrier discharge (DBD)-catalyst system with three catalysts: MnOx/ZSM-5, CoMnOx/ZSM-5, and CeMnOx/ZSM-5. V-Q Lissajous method, Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD), and X-ray photoelectron (XPS) are used to characterize the DBD and catalysts. The DBD processing partially oxidizes the toluene, and the removal efficiency has a linear relationship with ozone generation. Three DBD-catalyst systems are compared in terms of their toluene removal efficiency, Fourier transform infrared (FTIR) spectra, carbon balance, CO selectivity, CO2 selectivity, and ozone residual. The results show that the DBD-catalyst system with CoMnOx/ZSM-5 performs better than the other two systems. It has the highest removal efficiency of about 93.7 %, and the corresponding energy yield is 4.22 g/kWh. The carbon balance and CO2 selectivity of CoMnOx/ZSM-5 is also better than the other two catalysts. The measurements of two important byproducts including aerosols and ozone are also presented.