ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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

Li-Cheng Wu, Qian Wang, Wei Zhao, and Emmanuel K. Payne

Jiangsu University, Zhenjiang, China

E-mail: wulicheng@ujs.edu.cn

Abstract: Selective catalytic reduction (SCR) with ammonia has been considered as the most promising technology, as its effect deals with the NO_X. 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 NO_X 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.

Keywords: Fe doping ; SCR ; V₂O₅/TiO₂ 

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-018-0437-3

Chemical Papers 72 (8) 1981–1989 (2018)