Preparation and catalytic behaviors of an iron-based V–W–Ti catalyst: a novel strategy for low-temperature denitrification and synergistic toluene removal

Abstract

Fe-doped vanadium tungsten titanium (V–W–Ti) catalysts were fabricated via an impregnation method. Furthermore, the catalysts were systematically investigated through SEM, BET, XPS, XRD, H₂-TPR, NH₃-TPD and in situ infrared spectroscopy. On this basis, the catalytic performance of the Fe-doped V–W–Ti catalyst for the simultaneous removal of NO_x and toluene was investigated. Test results confirmed that the V–W–Ti catalyst exhibited excellent low-temperature performance with the assistance of a large specific surface area TiO₂ carrier and Fe dopant. XPS results confirmed that the doping of Fe increased adsorbed oxygen and high valence vanadium, promoting the activation and adsorption of reactants and thus resulting in a conversion rate of NO_x as high as 99.1% at 200 °C. In situ FTIR proved that toluene gas reduced low-temperature NH₃-SCR performance via competitive adsorption with SCR gases. At the same time, enhanced oxygen mobility caused by the introduction of Fe promoted the complete oxidation of toluene, increasing the toluene removal rate by 10–20% in the synergistic denitrification and toluene removal process at 200 °C. This work provides a certain research and experimental basis for the investigation of the synergistic removal of NO_x and toluene in low-temperature industrial flue gas.