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Citation: JI Sheng-xiao, ZHANG Wei-jian, ZHENG Yu-ying, ZHU Jian-feng. Low-temperature combustion synthesis of the Mn-CeOx catalyst and its performance in the selective catalytic reduction of NOx by NH3[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(2): 224-232. shu

Low-temperature combustion synthesis of the Mn-CeOx catalyst and its performance in the selective catalytic reduction of NOx by NH3

  • 1.

    College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China

  • 2.

    Fujian Chenqi New Material Technology Co., Ltd., Quanzhou 362200, China

  • 3.

    Fujian Key Laboratory of Rubber and Plastics New Materials, Quanzhou 362211, China

  • Corresponding author: ZHENG Yu-ying, yyzheng@fzu.edu.cn
  • Received Date: 30 October 2018
    Revised Date: 16 December 2018

    Fund Project: the Science and Technology Program of Fuzhou 2016-G-72The project was supported by the Science and Technology Program of Fuzhou (2016-G-72)

Figures(9)

  • A series of Mn-CeOx(LCS) catalysts with different molar ratios of metal nitrates to citric acid were prepared by low-temperature combustion synthesis (LCS) method. Through a comparison with the Mn-CeOx(CP) catalysts prepared by coprecipitation method (CP) as well as various characterization techniques such as XRD, XPS, FESEM, H2-TPR and nitrogen physisorption, the catalytic performance of Mn-CeOx(LCS) in the selective catalytic reduction (SCR) of NOx by NH3 was then investigated. The results show that the molar ratio of metal nitrate to citric acid is an important factor affecting the denitrification performance of the Mn-CeOx(LCS) catalysts. In comparison with the Mn-CeOx(CP) catalysts, the Mn-CeOx(LCS) catalysts are provided with a higher manganese content and high Oα/(Oα+Oβ) ratio on the surface as well as more hierarchical pores favorable for adsorption and reaction of reactants, which affords the Mn-CeOx(LCS) catalysts much better denitrification performance. Over the Mn-CeOx(LCS) catalyst with a molar ratio of metal nitrate to citric acid of 36:22, the denitrification rate at 80-180℃ reaches 75%-100%; even in the presence of SO2, the denitrification rate over the Mn-CeOx(LCS) catalyst at 180℃ keeps at the level of 74%.
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