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With the increasing strictness of automobile emission regulations, the emission problem of N2O, a by-product of three-way catalytic converters (TWC), has gained attention and become a research hotspot. In this paper, theoretical calculations and experimental analyses were used to study the catalytic decomposition performance of N2O by different ionic modified zeolites. Quantum chemistry method based on density functional theory (DFT) was used to calculate the decomposition path and reaction energy of N2O molecule on Rh3+, Pd2+ and Fe2+ modified zeolites. The results showed that the Rh modified zeolite exhibit better catalytic performance for N2O decomposition. Rh modified ZSM-5 zeolites with different Si/Al ratios were prepared. The effects of N2O pretreatment, the Si/Al ratio of zeolite, and water vapor in exhaust gas on the catalytic decomposition performance of N2O were investigated. The results demonstrated that Rh modification is beneficial for improving the N2O catalytic decomposition ability of zeolite. N2O pretreatment can enhance the N2O decomposition performance of Rh-ZSM-5 catalyst at low temperatures. The presence of water vapor reduces the catalytic decomposition performance of the catalyst for N2O at low temperatures, while at high temperatures, as water vapor desorbs, its impact on N2O catalytic performance is diminished.

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Study on the Catalytic Performance of Modified Zeolite for N2O Emissions from Gasoline Engines

  • 会议论文

  • 发表日期：

    2026年

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  • Yuanwang Deng,
  • Yuan Deng,
  • Changling Feng

摘要

With the increasing strictness of automobile emission regulations, the emission problem of N2O, a by-product of three-way catalytic converters (TWC), has gained attention and become a research hotspot. In this paper, theoretical calculations and experimental analyses were used to study the catalytic decomposition performance of N2O by different ionic modified zeolites. Quantum chemistry method based on density functional theory (DFT) was used to calculate the decomposition path and reaction energy of N2O molecule on Rh3+, Pd2+ and Fe2+ modified zeolites. The results showed that the Rh modified zeolite exhibit better catalytic performance for N2O decomposition. Rh modified ZSM-5 zeolites with different Si/Al ratios were prepared. The effects of N2O pretreatment, the Si/Al ratio of zeolite, and water vapor in exhaust gas on the catalytic decomposition performance of N2O were investigated. The results demonstrated that Rh modification is beneficial for improving the N2O catalytic decomposition ability of zeolite. N2O pretreatment can enhance the N2O decomposition performance of Rh-ZSM-5 catalyst at low temperatures. The presence of water vapor reduces the catalytic decomposition performance of the catalyst for N2O at low temperatures, while at high temperatures, as water vapor desorbs, its impact on N2O catalytic performance is diminished.