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Enhanced low-temperature NH3-SCR performance of MnOx/CeO2 catalysts by optimal solvent effect
Yao, Xiaojiang1,2,3; Kong, Tingting1; Chen, Li3; Ding, Shimin1; Yang, Fumo1,2,3; Dong, Lin4
2017-10-31
摘要A series of MnOx/CeO2 catalysts were prepared by modulating the solvents (deionized water (DW), anhydrous ethanol (AE), acetic acid (AA), and oxalic acid (OA) solution) with the purpose of improving the low-temperature NH3-SCR performance, broadening the operating temperature window, and enhancing the H2O + SO2 resistance. The synthesized catalysts were characterized by means of N-2-physisorption, XRD, EDS mapping, Raman, XPS, H-2-TPR, NH3-TPD, and in situ DRIFTS technologies. Furthermore, the catalytic performance and H2O + SO2 resistance were evaluated by NH3-SCR model reaction. The obtained results indicate that MnOx/CeO2 catalyst prepared with oxalic acid solution as a solvent exhibits the best catalytic performance among these catalysts, which shows above 80% NO conversion during a wide operating temperature range of 100-250 degrees C and good H2O + SO2 resistance for low-temperature NH3-SCR reaction. This is related to that oxalic acid solution can promote the dispersion of MnOx and enhance the electron interaction between MnOx and CeO2, which are beneficial to improving the physicochemical property of MnOx/CeO2 catalyst, and further lead to the enhancement of catalytic performance and good H2O + SO2 resistance. (C) 2017 Elsevier B.V. All rights reserved.
关键词MnOx/CeO2 catalysts Solvent effect Low-temperature NH3-SCR Dispersion Electron interaction
DOI10.1016/j.apsusc.2017.05.156
发表期刊APPLIED SURFACE SCIENCE
ISSN0169-4332
卷号420页码:407-415
收录类别EI
WOS记录号WOS:000407222300049
语种英语