Diesel vehicle emissions: Dissecting the multi-factorial effect on variations of VOC-component concentrations

IF 6 2区工程技术 Q1 ENVIRONMENTAL SCIENCES

Urban Climate Pub Date : 2024-10-13 DOI:10.1016/j.uclim.2024.102157

Chang Wang , Xueyao Li , Xiaohan Miao , Jingyuan Li , Yong Li , Congbo Song , Zhiwen Yang , Jingyu Qi , Taosheng Jin

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Abstract

As emission standards tighten, addressing Volatile Organic Compounds (VOCs) has become more urgent. The VOC emissions from diesel vehicles are underestimated in transportation, emphasizing the need to reexamine their emission characteristics. Our study analyzed four diesel vehicles and found that aromatics and alkanes were the dominant categories of VOCs, which accounted for approximately 24 % and 19 %, respectively. Tetrahydrofuran, acetone, and toluene were identified as the main components of VOCs, accounting for 78 % of the total emissions. Specifically, the implementation of tighter emission standards for diesel vehicles resulted in a reduction in the contribution of alkanes to VOC emissions, while that of aromatics increased notably. As the driving speed increased, emissions of aromatics and Volatile Halogenated Hydrocarbons (VHCs) experienced a decreasing trend. In addition, Selective Catalytic Reduction (SCR) has the significant impact on aromatics and VHCs, while cold and hot starts phases affect aromatic emissions mostly, as confirmed by Criteria Importance Through Intercriteria Correlation (CRITIC) analysis.

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柴油车排放：剖析多因素对挥发性有机化合物成分浓度变化的影响

随着排放标准的收紧，解决挥发性有机化合物（VOC）问题变得更加紧迫。在运输过程中，柴油车的挥发性有机化合物排放量被低估，因此有必要重新研究其排放特性。我们的研究分析了四辆柴油车，发现芳烃和烷烃是挥发性有机化合物的主要类别，分别约占 24% 和 19%。四氢呋喃、丙酮和甲苯是挥发性有机化合物的主要成分，占总排放量的 78%。具体来说，柴油车执行更严格的排放标准导致烷烃在挥发性有机化合物排放中的比例下降，而芳烃的比例则显著上升。随着行驶速度的提高，芳烃和挥发性卤代烃的排放量呈下降趋势。此外，选择性催化还原（SCR）对芳烃和挥发性卤代烃的影响最大，而冷启动和热启动阶段对芳烃排放的影响最大，这一点已通过标准相关性分析（CRITIC）得到证实。

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来源期刊

Urban Climate Social Sciences-Urban Studies

CiteScore

9.70

自引率

9.40%

发文量

286

期刊介绍： Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]