Citation: Shanyuan Bi, Jin Zhang, Dengchao Peng, Danhong Cheng, Jianping Zhang, Lupeng Han, Dengsong Zhang. Improved N₂ selectivity for low-temperature NO_x reduction over etched ZSM-5 supported MnCe oxide catalysts[J]. Chinese Chemical Letters, ;2025, 36(5): 110295. doi: 10.1016/j.cclet.2024.110295 shu

Improved N₂ selectivity for low-temperature NO_x reduction over etched ZSM-5 supported MnCe oxide catalysts

International Joint Laboratory of Catalytic Chemistry, State Key Laboratory of Advanced Special Steel, Innovation Institute of Carbon Neutrality, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China

wjpzjp@shu.edu.cn

lphan@shu.edu.cn

dszhang@shu.edu.cn

Received Date: 16 March 2024
Revised Date: 25 June 2024
Accepted Date: 24 July 2024
Available Online: 25 July 2024

Figures(6)

Developing a high-efficiency catalyst with both superior low-temperature activity and good N₂ selectivity is still challenging for the NH₃ selective catalytic reduction (SCR) of NO_x from mobile sources. Herein, we demonstrate the improved low-temperature activity and N₂ selectivity by regulating the redox and acidic properties of MnCe oxides supported on etched ZSM-5 supports. The etched ZSM-5 enables the highly dispersed state of MnCeO_x species and strong interaction between Mn and Ce species, which promotes the reduction of CeO₂, facilitates electron transfer from Mn to Ce, and generates more Mn⁴⁺ and Ce³⁺ species. The strong redox capacity contributes to forming the reactive nitrate species and -NH₂ species from oxidative dehydrogenation of NH₃. Moreover, the adsorbed NH₃ and -NH₂ species are the reactive intermediates that promote the formation of N₂. This work demonstrates an effective strategy to enhance the low-temperature activity and N₂ selectivity of SCR catalysts, contributing to the NO_x control for the low-temperature exhaust gas during the cold-start of diesel vehicles.
- NO_x,
- Selective catalytic reduction,
- Mn-based catalyst,
- Low-temperature activity,
- N₂ selectivity
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沈阳化工大学材料科学与工程学院沈阳 110142

Improved N2 selectivity for low-temperature NOx reduction over etched ZSM-5 supported MnCe oxide catalysts

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通讯作者: 陈斌, bchen63@163.com

Improved N₂ selectivity for low-temperature NO_x reduction over etched ZSM-5 supported MnCe oxide catalysts