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

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

School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang, China

Received Date: 15 December 2017
Revised Date: 12 January 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (51008277), the Natural Science Foundation of Zhejiang Province (LY14E080001), and the Key Project of Zhejiang Provincial Science and Technology Program (2012C03003-4).

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.
- Cu-Mn/SAPO-34,
- Cu-Mn/ZSM-5,
- Diesel engine exhaust,
- Hydrothermal stability,
- Resistance to hydrocarbons
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沈阳化工大学材料科学与工程学院沈阳 110142

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

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