Progress for Studying on Sulfur Poisoning and Regeneration over Cu/CHA NH<sub>3</sub>-SCR Catalysts

化学工业与工程

Chemcial Industry and Engineering

2020, Vol. 37

Issue (5) :7-13 DOI: 10.13353/j.issn.1004.9533.20200104

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Progress for Studying on Sulfur Poisoning and Regeneration over Cu/CHA NH₃-SCR Catalysts

Shen Meiqing¹, Li Xinhua¹, Wang Chen^1,2, Wang Jun¹

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China

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Abstract Nowadays, NO_x emission from diesel is one of main focuses in China. Copper based on small-pore molecular sieves (Cu/CHA) owing to high NO_x activity at low temperature, great N₂ selectivity, wide temperature window and excellent hydrothermal stability have become the main SCR catalysts for diesel. However, sulfur is easy to affect Cu/CHA catalysts and will in turn lead to catalysts have inferior SCR performance. Facing to the above problem, this review sums up the research progress relative with mechanism of NH₃-SCR on Cu/CHA, including the active sites and the nature of NH₃-SCR reaction. Subsequently, the effect of sulfur oxides on Cu/CHA catalysts, mainly contains on the variation relationship between active sites, structure and SCR activity, are great concerned. Finally, the method and nature of regeneration on sulfated catalysts are also involved in this review. This review could give solid basis and guideline for efficient utilization of Cu/CHA catalysts.

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	Shen Meiqing
	Li Xinhua
	Wang Chen
	Wang Jun

Keywords： copper； small-pore molecular sieves； H₃-SCR mechanism； sulfur poisoning； regeneration

Received 2020-01-08;

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Shen Meiqing, Li Xinhua, Wang Chen, Wang Jun.Progress for Studying on Sulfur Poisoning and Regeneration over Cu/CHA NH₃-SCR Catalysts[J] Chemcial Industry and Engineering, 2020,V37(5): 7-13

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