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Citation: WU Xiao-min, NI Kai-wen, YU Xiao-long, ZHAO Ning. in-situ DRIFTs study on different exposed facets of VOx-MnOx/CeO2 catalysts for low-temperature NH3-SCR[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(2): 179-188. shu

in-situ DRIFTs study on different exposed facets of VOx-MnOx/CeO2 catalysts for low-temperature NH3-SCR

  • 1.

    Department of Environmental Science & Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China

  • 2.

    State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

  • Corresponding author: WU Xiao-min, wuxiaomin@hqu.edu.cn
  • Received Date: 24 October 2019
    Revised Date: 28 January 2020

    Fund Project: the Xiamen Science and Technology Program Funds 3502Z20183025the Scientific Research Funds of Huaqiao University 605-50Y17071The project was supported by the National Key Research and Development Program of China 2018YFC0214103The project was supported by the National Key Research and Development Program of China (2018YFC0214103), the Xiamen Science and Technology Program Funds (3502Z20183025) and the Scientific Research Funds of Huaqiao University (605-50Y17071)

Figures(7)

  • In order to achieve the low-temperature (200-250℃) NH3-SCR, highly dispersed VOx-MnOx/CeO2 catalysts with different exposed facets were produced. The NH3-SCR performance results indicate that the NO conversion over VOx-MnOx/CeO2-R with preferentially exposed {110} facets can achieve NO conversion >95% over a wide temperature span of 220-330℃. From the in-situ DRIFTs, gaseous NH3 and NO are favorable to be absorbed on the surface of the VOx-MnOx/CeO2-R catalyst with preferentially exposed {110} facets, which improves the efficiency of NO conversion. The mechanism study via in situ DRIFTs demonstrates that the well dispersed vanadium species on CeO2 {110} absorb NH3 to generate NH3(L) and NH4+(B) species, which in turn become highly reactive toward bridging nitrate and bidentate nitrate species to form N2 and H2O according to the Langmuir-Hinshelwood mechanism.
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