Effects of the structure parameters on methane emission control of an adsorptive three-way catalytic converter during cold start of the heavy-duty natural gas engines

Yan Tan, Chuanfu Kou, Dezhong Ning, Jiaqiang E and Changling Feng

Energy, 2025, vol. 317, issue C

Abstract: In this work, an adsorptive three-way catalytic converter (A-TWC) coated with adsorbent material is proposed for controlling the methane emissions during cold start of natural gas engines. The adsorption source is provided by the fitted Dubinin-Astakhov model using the fluent UDF function. The influence of structure parameters on the CH4 adsorption and conversion performance of A-TWC during cold start of natural gas engines is investigated. The results show that the decrease of porosity is beneficial to improve the adsorption capacity of A-TWC for CH4. As the porosity decreases from 0.85 to 0.7, the duration of adsorption efficiency above 50 % increases by 30.7 %. As the carrier length increases from 120 mm to 200 mm at 45.1s, the CH4 adsorption efficiency obviously increases by 52.9 %. The fuzzy grey relational analysis results show that the primary and secondary relationships of the investigated factors are carrier diameter > carrier length > porosity for CH4 adsorption efficiency, and porosity > carrier length > carrier diameter for CH4 conversion efficiency. Case 6 shows the best total removal performance than other cases. Compared to the base physical model of A-TWC, the duration of total CH4 removal efficiency above 50 % of the case 6 is improved by 21.8 %, while the carrier volume increased by 60.6 %.

Keywords: Natural gas engine; Adsorptive three-way catalytic converter; Cold start methane emission; Adsorption efficiency; Conversion efficiency (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:317:y:2025:i:c:s0360544225002968

DOI: 10.1016/j.energy.2025.134654

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