Stability of Cu-Mn bimetal catalysts based on different zeolites for NOx removal from diesel engine exhaust

doi:10.1016/S1872-2067(18)63013-X

Abstract

Abstract:

Cu-Mn bimetal catalysts were prepared to remove nitrogen oxides (NO_x) from diesel engine exhaust at low temperatures. At a Cu/Mn ratio of 3:2, the NO_x conversions at 200℃ reached 65% and 90% on Cu-Mn/ZSM-5 and Cu-Mn/SAPO-34, respectively. After a hydrothermal treatment and reaction in the presence of C₃H₆, the activity of Cu-Mn/SAPO-34 was more stable than that of Cu-Mn/ZSM-5. No obvious variations in the crystal structure or dealumination were observed, whereas the physical structure was best maintained in Cu-Mn/SAPO-34. The atomic concentration of Cuon the surface of Cu-Mn/SAPO-34 was quite stable, and the consumption of octahedrally coordinated Cu²⁺ could be recovered. Conversely, the proportion of octahedrally coordinated Cu²⁺ on the surface of Cu-Mn/ZSM-5 significantly decreased. Therefore, besides the structure, the redox cycle between Cu⁺ and octahedrally coordinated Cu²⁺ played an important role in the stability of the catalysts.

Key words: Cu-Mn/SAPO-34, Cu-Mn/ZSM-5, Diesel engine exhaust, Hydrothermal stability, Resistance to hydrocarbons

Shuang Zhao, Liming Huang, Boqiong Jiang, Min Cheng, Jiawei Zhang, Yijing Hu. Stability of Cu-Mn bimetal catalysts based on different zeolites for NO_x removal from diesel engine exhaust[J]. Chinese Journal of Catalysis, 2018, 39(4): 800-809.

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https://www.cjcatal.com/EN/Y2018/V39/I4/800

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Stability of Cu-Mn bimetal catalysts based on different zeolites for NO_x removal from diesel engine exhaust

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