Effect of water vapor on NH3-NO/NO2 SCR performance of fresh and aged MnOx-NbOx-CeO2 catalysts

被引:36
作者
Chen, Lei [1 ]
Si, Zhichun [2 ]
Wu, Xiaodong [1 ]
Weng, Duan [1 ]
Wu, Zhenwei [1 ]
机构
[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Grad Sch Shenzhen, Shenzhen 518055, Peoples R China
来源
JOURNAL OF ENVIRONMENTAL SCIENCES | 2015年 / 31卷
基金
中国国家自然科学基金;
关键词
Water effect; MnOx-NbOx-CeO2; catalysts; Acid sites; Fast SCR reaction; NO/NO2; ratio; LOW-TEMPERATURE SCR; MNOX-CEO2; CATALYST; OXIDE CATALYSTS; FT-IR; REDUCTION; NO; NH3; NH3-SCR; OXIDATION; ADSORPTION;
D O I
10.1016/j.jes.2014.07.037
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A MnOx-NbOx-CeO2 catalyst for low temperature selective catalytic reduction (SCR) of NOx with NH3 was prepared by a sol-gel method, and characterized by NH3-NO/NO2 SCR catalytic activity, NO/NH3 oxidation activity, NOx/NH3 TPD, XRD, BET, H-2-TPR and in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The results indicate that the MnOx-NbOx-CeO2 catalyst shows excellent low temperature NH3-SCR activity in the temperature range of 150-300 degrees C. Water vapor inhibits the low temperature activity of the catalyst in standard SCR due to the inhibition of NOx adsorption. As the NO2 content increases in the feed, water vapor does not affect the activity in NO2 SCR. Meanwhile, water vapor significantly enhances the N-2 selectivity of the fresh and the aged catalysts due to its inhibition of the decomposition of NH4NO3 into N2O. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
引用
收藏
页码:240 / 247
页数:8
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