Promoting NO removal performance of Fenton-like enhanced SCR reactions via modulating V/Fe in Fe-V oxides

Abstract

Low-temperature NO removal technology was critical for tail gas purification. Our previous work has proposed an efficient Fenton-like enhanced SCR reaction over monoclinic FeVO4. This work modulates the V to Fe ratio (V/Fe) in Fe-V oxides to enhance the NO removal activity. The textual characterization and NO removal of FeV0.82Ox, FeV1.31Ox, FeV1.52Ox, and FeV1.96Ox were carried out to investigate the structure–activity relationships. For the Fenton-like enhanced SCR reactions, the NO removal efficiency was affected by catalysts with different V/Fe. Based on XPS, NH3-TPD, and •OH annihilation tests, it could be deduced that the NO removal in Fenton-like enhanced SCR reactions was simultaneously affected by the performance of SCR reactions and Fenton-like reactions. The density functional theory calculation indicated that the H2O2 was more likely adsorbed on Fe sites of Fe2V4O13, and the adsorption of NH3 was conducive to the oxidized V sites of FeVO4. The research elucidated the modulation strategy for NO removal via Fenton-like enhanced SCR reactions over Fe-V oxides.