| Effect of Ce doping of TiO2 support on NH3-SCR activity over V2O5-WO3/CeO2-TiO2 catalyst |
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| 作者姓名： | Kai Cheng Jian Liu Tao Zhang Jianmei Li Zhen Zhao Yuechang Wei Guiyuan Jiang Aijun Duan |
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| 作者单位： | State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China |
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| 基金项目： | This work was financially supported by the National Natural Science Foundation of China (Nos. 21376261, 21173270, 21177160), the National Hi-Tech Research and Development Program (863) of China (No. 2013AA065302), the Beijing Natural Science Foundation (2142027), the Doctoral Selection Fund (No. 20130007110007) and the China University of Petroleum Fund (No. KYJJ2012-06-31). |
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| 摘 要： | CeO2–TiO2composite supports with different Ce/Ti molar ratios were prepared by a homogeneous precipitation method, and V2O5–WO3/CeO2–TiO2catalysts for the selective catalytic reduction（SCR） of NOx with NH3 were prepared by an incipient-wetness impregnation method. These catalysts were characterized by means of BET, XRD, UV–Vis,Raman and XPS techniques. The results showed that the catalytic activity of V2O5–WO3/TiO2 was greatly enhanced by Ce doping（molar ratio of Ce/Ti = 1/10） in the TiO2 support.The catalysts that were predominantly anatase TiO2 showed better catalytic performance than the catalysts that were predominantly fluorite CeO2. The Ce additive could enhance the surface adsorbed oxygen and accelerate the SCR reaction. The effects of O2 concentration, ratio of NH3/NO, space velocity and SO2 on the catalytic activity were also investigated. The presence of oxygen played an important role in NO reduction. The optimal ratio of NH3/NO was 1/1 and the catalyst had good resistance to SO2 poisoning.
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| 关 键 词： | TiO2催化剂 二氧化钛载体 催化活性 氧化铈 V2O5 选择性催化还原 铈掺杂 Ce掺杂 |
| 收稿时间： | 28 November 2013 |
| 修稿时间： | 21 January 2014 |
Effect of Ce doping of TiO2 support on NH3-SCR activity over V2O5-WO3/CeO2-TiO2 catalyst |
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| Kai Cheng,Jian Liu,Tao Zhang,Jianmei Li,Zhen Zhao,Yuechang Wei,Guiyuan Jiang,Aijun Duan.Effect of Ce doping of TiO2 support on NH3-SCR activity over V2O5-WO3/CeO2-TiO2 catalyst[J].Journal of Environmental Sciences,2014,26(10):2106-2113. |
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| Authors: | Kai Cheng Jian Liu Tao Zhang Jianmei Li Zhen Zhao Yuechang Wei Guiyuan Jiang and Aijun Duan |
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| Institution: | State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China |
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| Abstract: | CeO2-TiO2 composite supports with different Ce/Ti molar ratios were prepared by a homogeneous precipitation method, and V2O5-WO3/CeO2-TiO2 catalysts for the selective catalytic reduction (SCR) of NOx with NH3 were prepared by an incipient-wetness impregnation method. These catalysts were characterized by means of BET, XRD, UV-Vis, Raman and XPS techniques. The results showed that the catalytic activity of V2O5-WO3/TiO2 was greatly enhanced by Ce doping (molar ratio of Ce/Ti=1/10) in the TiO2 support. The catalysts that were predominantly anatase TiO2 showed better catalytic performance than the catalysts that were predominantly fluorite CeO2. The Ce additive could enhance the surface adsorbed oxygen and accelerate the SCR reaction. The effects of O2 concentration, ratio of NH3/NO, space velocity and SO2 on the catalytic activity were also investigated. The presence of oxygen played an important role in NO reduction. The optimal ratio of NH3/NO was 1/1 and the catalyst had good resistance to SO2 poisoning. © 2014 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. |
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| Keywords: | CeO2-TiO2 SCR Nitrogen oxides Homogeneous precipitation method SO2 poisoning |
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