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

JI Sheng-xiao; ZHANG Wei-jian; ZHENG Yu-ying; ZHU Jian-feng

Volume 47 Issue 2

Feb. 2019

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Article Navigation > Journal of Fuel Chemistry and Technology > 2019 > 47(2): 224-232

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.

Citation:

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

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Low-temperature combustion synthesis of the Mn-CeO_x catalyst and its performance in the selective catalytic reduction of NO_x 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

Funds:

the Science and Technology Program of Fuzhou 2016-G-72

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Corresponding author: ZHENG Yu-ying, Tel：0591-22866524，E-mail: yyzheng@fzu.edu.cn
Received Date: 2018-10-30
Rev Recd Date: 2018-12-16

Available Online: 2021-01-23

Publish Date: 2019-02-10

Abstract

Abstract

A series of Mn-CeO_x(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-CeO_x(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-CeO_x(LCS) in the selective catalytic reduction (SCR) of NO_x 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-CeO_x(LCS) catalysts. In comparison with the Mn-CeO_x(CP) catalysts, the Mn-CeO_x(LCS) catalysts are provided with a higher manganese content and high O_α/(O_α+O_β) ratio on the surface as well as more hierarchical pores favorable for adsorption and reaction of reactants, which affords the Mn-CeO_x(LCS) catalysts much better denitrification performance. Over the Mn-CeO_x(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-CeO_x(LCS) catalyst at 180℃ keeps at the level of 74%.
- low-temperature combustion synthesis,
- Mn-CeO_x,
- NH₃-SCR,
- nitrogen oxides

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References(12)

References

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