期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 31, 期 -, 页码 74-80出版社
SCIENCE PRESS
DOI: 10.1016/j.jes.2014.09.040
关键词
VCeSb/TiO2 catalyst; SCR; Denitration; Low temperature; N-2 selectivity
资金
- Natural Science Foundation of China [21376261, 21173270]
- Beijing Natural Science Foundation [2142027]
- Doctor select Foundation [20130007110007]
- National Hi-Tech Research and Development Program (863) of China [2013AA065302]
Selective catalytic reduction technology using NH3 as a reducing agent (NH3-SCR) is an effective control method to remove nitrogen oxides. TiO2-supported vanadium oxide catalysts with different levels of Ce and Sb modification were prepared by an impregnation method and were characterized by X-ray diffractometer (XRD), Brunauer-Emmett-Teller (BET), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), Raman and Hydrogen temperature-programmed reduction (H-2-TPR). The catalytic activities of V(5)CexSby/TiO2 catalysts for denitration were investigated in a fixed bed flow microreactor. The results showed that cerium, vanadium and antimony oxide as the active components were well dispersed on TiO2, and the catalysts exhibited a large number of d-d electronic transitions, which were helpful to strengthen SCR reactivity. The V(5)CexSby/TiO2 catalysts exhibited a good low temperature NH3-SCR catalytic activity. In the temperature range of 210 to 400 degrees C, the V(5)CexSby/TiO2 catalysts gave NO conversion rates above 90%. For the best V5Ce35Sb2/TiO2 catalyst, at a reaction temperature of 210 degrees C, the NO conversion rate had already reached 90%. The catalysts had different catalytic activity with different Ce loadings. With the increase of Ce loading, the NO conversion rate also increased. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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