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N2O formation mechanism of diesel engine exhaust close-coupled SCR catalyst
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Lingzhi Li1, Qingyun Su1, 2, 3, Junyu Lang2, 3, Quanli Dou2, Changquan Liu2, Demin Jia2
Transactions of CSICE | 2025, 43(6) : 490 - 499
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Transactions of CSICE | 2025, 43(6): 490-499
N2O formation mechanism of diesel engine exhaust close-coupled SCR catalyst
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Lingzhi Li1, Qingyun Su1, 2, 3, Junyu Lang2, 3, Quanli Dou2, Changquan Liu2, Demin Jia2
Affiliations
  • 1.Institute of Internal Combustion Engine，Dalian University of Technology，Dalian 116024，China
  • 2.State Key Laboratory of Engine and Powertrain System，Weichai Power Company Limited，Weifang 261061，China
  • 3.Weichai Power Emission Solutions Incorporated，Weifang 261061，China
Published: 2025-11-25 doi: 10.16236/j.cnki.nrjxb.202506055
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The mechanisms of N2O formation during NOx reduction over close-coupled selective catalytic reduction(cc-SCR) catalysts for diesel engine exhaust were investigated by small-sample catalysts test combined with numerical simulations. Research results indicate that N2O is formed at both low(170—300℃) and high(>300℃) temperatures over cc-SCR catalysts. At high temperatures，N2O is formed as a byproduct through the oxidation of NH3. However，at low temperatures，the N2O formation pathway differs from the ammonium nitrate(NH4NO3) decomposition pathway observed in conventional SCR systems commonly used in China Ⅵ diesel vehicles. Considering the absence of upstream diesel oxidation catalyst(DOC) for NO oxidation and the inhibitory effect of water vapor(vaporous state) on NH4NO3 formation in the cc-SCR system，a low-temperature N2O formation mechanism via the non-ammonium nitrate pathway was introduced and the single-site kinetic model was utilized during the simulation. The modified reaction mechanisms incorporate temperature-dependent N2O formation，enabling accurate prediction of N2O volume fractions at a space velocity of 40000h-1 across the temperature range of 170℃ to 450℃. Furthermore，the impact of NH3 coverage on N2O formation was also studied. Results demonstrate that N2O formation rates increase with higher NH3 coverage. Additionally，O2 enhances N2O production at elevated NH3 coverage by promoting NH3 dehydrogenation.

diesel engine  /  nitrogen oxides  /  selective catalytic reduction  /  small-sample catalysts test
李凌志, 苏庆运, 郎俊宇, 窦全礼, 刘昌泉, 贾德民. 柴油机尾气紧耦合SCR催化剂的N2O生成机理. 内燃机学报, 2025 , 43 (6) : 490 -499 . DOI: 10.16236/j.cnki.nrjxb.202506055
Lingzhi Li, Qingyun Su, Junyu Lang, Quanli Dou, Changquan Liu, Demin Jia. N2O formation mechanism of diesel engine exhaust close-coupled SCR catalyst[J]. Transactions of CSICE, 2025 , 43 (6) : 490 -499 . DOI: 10.16236/j.cnki.nrjxb.202506055
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Year 2025 volume 43 Issue 6
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Article Info
doi: 10.16236/j.cnki.nrjxb.202506055
  • Receive Date：2025-02-25
  • Online Date：2026-11-04
  • Published：2025-11-25
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History
  • Received：2025-02-25
  • Revised：2025-07-03
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Affiliations
    1.Institute of Internal Combustion Engine，Dalian University of Technology，Dalian 116024，China
    2.State Key Laboratory of Engine and Powertrain System，Weichai Power Company Limited，Weifang 261061，China
    3.Weichai Power Emission Solutions Incorporated，Weifang 261061，China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
Number of
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Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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