Abstract
This study aimed at investigating the photocatalytic oxidation removal of NO from the flue gas of coal-fired boilers by H2O2/UV (UV is ultraviolet radiation) reaction over TiS catalyst. The effects of different catalysts and gas composition on the oxidation of NO were investigated. We found that the S doped titania (TiO2) catalyst could clearly improve the NO oxidation, compared with TiO2 and no catalyst in the H2O2/UV system. In addition, the H2O2 and UV also played an important role in the NO oxidation. The NO oxidative product was the stable nitrate. Analysis of catalysts' characterization by XRD, TEM, XPS, UV–vis and DFT calculations showed that the S (S6+) doped TiO2 catalyst included the heterostructure of Ti1−xSxOx+2 compounds and TiO2. The S doping increased the VB potential for the TiS catalyst. We designed different tests of PL, LSV, EPR liquid UV–vis analysis-PCBA and RhB to confirm the mechanism of enhanced NO oxidation over TiS catalyst. It was found that the reactions in the VB were important to the NO oxidation over the TiS(TiO2)+UV+H2O2 catalytic system. Due to this reason, enhanced NO oxidation was achieved over the TiS catalyst.
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