Cu-SSZ-13与Fe-β混合催化剂上NH<sub>3</sub>-SCR性能研究

doi:10.11896/cldb.21070098

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Abstract Copper modified SSZ-13 molecular sieve (Cu-SSZ-13) is an efficient NH₃ selective reduction catalyst for NO_x removal, but the NO_x removal activity of Cu-SSZ-13 at high temperature (＞400 ℃) is poor. Compared with Cu-SSZ-13, Fe modified β molecular sieve catalyst (Fe-β) is cheaper and has better denitration performance at high temperature, so Fe-β has attracted much attention. The low temperature activity of Fe-β catalyst is improved after Cu doping, but cryogenic active temperature window and the maximum removal rate of SCR denitration catalyst still need to be improved. In this work, the composite catalyst was prepared by mechanical mixing of Cu-SSZ-13 and Fe-β to expand the temperature window of the catalyst. Cu-SSZ-13 was prepared by ion exchange of different concentrations of Cu(NO₃)₂ solution with commercial SSZ-13. The NH₃-SCR test results show that Cu-SSZ-13 prepared by exchange of Cu(NO₃)₂ solution with the concentration of 0.04 mol/L has the best denitration activity, and the NO_x removal rate is close to 100% at 200—400 ℃. The catalysts were characterized by powder X-ray diffraction (XRD), electron scanning microscope (SEM) and a series of other means. Reaction performance test results show that mechanical mixing of Cu-SSZ-13+Fe-β does not affect the low temperature activity window of NH₃-SCR of Cu-SSZ-13, but the high temperature performance of catalyst is improved after mechanical mixing.

Key words： Fe-β Cu-SSZ-13 mechanical mixing NH₃-SCR

Published: 10 October 2022 Online: 2022-10-12

CLC number:

O643.36

Fund:National Natural Science Foundation of China (91745116)

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	Articles by authors
	LI Yuan
	HOU Yukun
	ZHAO Liguo
	TAN Xiaoyao

Cite this article:

LI Yuan,HOU Yukun,ZHAO Liguo, et al. Study on NH₃-SCR Performance over Cu-SSZ-13 and Fe-β Mixed Catalysts[J]. Materials Reports, 2022, 36(19): 21070098-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21070098 OR http://www.mater-rep.com/EN/Y2022/V36/I19/21070098

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