Li-modified MnO2 catalyst and LiMn2O4 for selective catalytic reduction of NO with NH3

KONG Zhi-jian; WANG Cheng; DING Zheng-nan; CHEN Yin-fei; ZHANG Ze-kai

Volume 42 Issue 12

Dec. 2014

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Article Navigation > Journal of Fuel Chemistry and Technology > 2014 > 42(12): 1447-1454

KONG Zhi-jian, WANG Cheng, DING Zheng-nan, CHEN Yin-fei, ZHANG Ze-kai. Li-modified MnO2 catalyst and LiMn2O4 for selective catalytic reduction of NO with NH3[J]. Journal of Fuel Chemistry and Technology, 2014, 42(12): 1447-1454.

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KONG Zhi-jian, WANG Cheng, DING Zheng-nan, CHEN Yin-fei, ZHANG Ze-kai. Li-modified MnO₂ catalyst and LiMn₂O₄ for selective catalytic reduction of NO with NH₃[J]. Journal of Fuel Chemistry and Technology, 2014, 42(12): 1447-1454.

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Li-modified MnO₂ catalyst and LiMn₂O₄ for selective catalytic reduction of NO with NH₃

Institute of Chemical Reaction Engineering, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Received Date: 2014-09-10
Rev Recd Date: 2014-11-05
Publish Date: 2014-12-30

Abstract

Abstract

LiMn₂O₄ prepared by high temperature solid state reaction, pechini, and citric acid coordination methods was applied in selective catalytic reduction (SCR) of NO with NH₃. MnO₂ prepared by high temperature solid state reaction method and the activity was tested as a comparsion. The catalysts were characterized by N₂ adsorption-desorption, scanning electron microscopy, X-ray diffraction, H₂ temperature-programmed reduction, NH₃ temperature-programmed desorption, NO temperature-programmed desorption, and X-ray photoelectron spectroscopy. The results showed that high-temperature activity of SCR were improved after the introduction of Li into MnO₂. NO conversion on the LiMn₂O₄ prepared by pechini method was above 90% in the range of 130~260 ℃; NO conversion on the LiMn₂O₄ by high temperature solid state reaction method could be kept above 90% in the range of 90~310 ℃; while the temperature window of MnO₂ was only 140~280 ℃. Compared with MnO₂, LiMn₂O₄ crystal structure not only keeps more manganese cations at a relatively low valence of Mn³⁺, but also adjusts surface active oxygen. Meanwhile, the existence of Li adjusts surface-acid sites of LiMn₂O₄, thus alleviates the unselective oxidation of NH₃ in the high temperature, broadens the operating temperature window of NH₃-SCR reaction, and improves the catalyst tolerance of SO₂.
- Li,
- LiMn₂O₄,
- MnO₂,
- selective catalytic reduction,
- unselective oxidation

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References

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