Atmospheric pressure oxidation of dilute xylene using plasma-assisted MnOX catalysis system with different precursors

Abstract

Plasma-assisted MnOx catalysis technology has shown promising results in the decomposition of air pollution. In this work, MnOx catalysts with different precursor were prepared by impregnation method to enhance the oxidation ability of plasma for xylene. The performance of the catalyst was characterized by XRD, FT-IR, SEM, XPS and BET. The combined plasma and MnOx promoted the xylene removal efficiency CO2 selectivity and O3 conversion, while reduced NO2 in air discharge concentration. Among three catalysts prepared by precursors, the MnOx(MN) showed outstanding performance with excellent capacity in xylene oxidation (94.1%), CO2 selectivity (80.1%), O3 suppression (76.4%), and NO2 prohibition (78.5%) compared to MnOx(MA) and MnOx(MS). The excellent catalytic activity may be attributed to the fact that the anions containing in the precursors play a significant role on the distribution of MnOx on the support. Also, the Fourier infrared results show that a small amount of precursor anion are present in the MnOx gap, which affects the content of MnO2 (Mn4+) crystals and OH group on the surface the catalyst.