V2O5-(NH4)2V6O16·1.5H2O composite catalysts as novel platforms for high-efficiency catalytic ozonation of NO under low temperature

Abstract

In this study, the catalytic ozonation of NO by V-based catalysts was investigated with the aim of reducing O3 consumption and pay attention to the role of V-based species in the catalytic ozonation system. Vanadium oxide treated with varying ammonium fluoride were synthesized and the catalytic ozonation of NO were systematically studied. The VF1 catalyst displayed the highest catalytic ozonation of NO efficiency, with which NO oxidation efficiency of 71% and O3 leakage of less than 1 ppm at the molar ratio of O3/NO = 0.5. The phase of catalysts revealed that VFx (x = 0, 0.25, 0.5, 1, 1.5) was transformed from V2O5 to (NH4)2V6O16·1.5H2O species, and the surface of catalyst became rougher as the amount of ammonium fluoride treatment gradually increased. Besides, chemical properties analysis of the catalyst revealed that (NH4)2V6O16·1.5H2O promoted the content of surface –OH and the absorption of H2O, which was conducive to the generation of ·OH and ·O2− radicals with O3 introduced. Furthermore, the effect of SO2 and reaction temperature was also investigated in this system, which exhibited that SO2 was favorable for NO2 removal and temperature had little effect on NO oxidation efficiency.