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Study of Fe-doped V2O5/TiO2 catalyst for an enhanced NH3-SCR in diesel exhaust aftertreatment

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Selective catalytic reduction (SCR) with ammonia has been considered as the most promising technology, as its effect deals with the NOX. Novel Fe-doped V2O5/TiO2 catalysts were prepared by sol–gel and impregnation methods. The effects of iron content and reaction temperature on the catalyst SCR reaction activity were explored by a test device, the results of which revealed that catalysts could exhibit the best catalytic activity when the iron mass ratio was 0.05%. It further proved that the VTiFe (0.05%) catalyst performed the best in denitration and its NOX conversion reached 99.5% at 270 °C. The outcome of experimental procedures: Brunauer–Emmett–Teller surface area, X-ray powder diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed reduction and adsorption (H2-TPR, NH3-TPD) techniques showed that the iron existed in the form of Fe3+ and Fe2+ and the superior catalytic performance was attributed to the highly dispersed active species, lots of surface acid sites and absorbed oxygen. The modified Fe-doped catalysts do not only have terrific SCR activities, but also a rather broad range of active temperature which also enhances the resistance to SO2 and H2O.

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We gratefully acknowledge financial support from the National Natural Science Foundation of China (NOs. 51476071, . 51506077), Jiangsu Provincial Natural Science Foundation of China (NO. BK20150488), Jiangsu Provincial Natural Science Foundation of China (NO. 15KJB610003) and the Advanced Talent Foundation of Jiangsu University (NO. 15JDG156).

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Correspondence to Li-Cheng Wu.

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Wu, LC., Wang, Q., Zhao, W. et al. Study of Fe-doped V2O5/TiO2 catalyst for an enhanced NH3-SCR in diesel exhaust aftertreatment. Chem. Pap. 72, 1981–1989 (2018).

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