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

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, H-2-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 NOx 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 NOx as high as 99.1% at 200 degrees 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 degrees C. This work provides a certain research and experimental basis for the investigation of the synergistic removal of NOx and toluene in low-temperature industrial flue gas.