来自轻型汽油汽车的特定中间挥发性和半挥发性有机化合物 (I/SVOC):发动机和后处理技术的影响
Lewei Zeng1, Xuan Zheng1, Xiao He1
1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518060, PR China.
Environmental science & technology
|October 14, 2025
概括
汽油汽车产生的中间挥发性 (IVOC) 和半挥发性有机化合物 (SVOC) 的排放是二次有机气溶 (SOA) 形成的关键. 了解这些排放对于改善空气质量模型和控制策略至关重要.
科学领域:
- 大气化学 大气化学
- 汽车排放科学 汽车排放科学
背景情况:
- 轻型汽油车 (LDGV) 中产的中间挥发性 (IVOC) 和半挥发性有机化合物 (SVOC) 是二次有机气溶 (SOA) 的重要前体.
- 这些化合物的排放特性尚不清楚,特别是随着发动机和后处理技术的不断发展.
研究的目的:
- 描述和比较来自端口燃料喷射 (PFI) 和汽油直接喷射 (GDI) 发动机的IVOC和SVOC排放.
- 调查汽油颗粒过器 (GPF) 和冷启动条件对这些排放的影响.
- 改进排放档案并改善SOA形成预测.
主要方法:
- 利用二维气体染色学-质谱学 (GC × GC-MS) 来分辨LDGV排气中的2000多种有机物种.
- 分析了不同发动机类型 (PFI与GDI) 的排放,以及使用/不使用GPF的排放.
- 在冷启动条件下和不同的环境温度下评估的排放量.
主要成果:
- 有氧化化合物 (酸,碳基) 主导气态I/SVOCs (40.5-58.5%).
- 与PFI相比,GDI发动机增加了45.6%的氧化I/SVOC,而PFI发出了更多的减少物种.
- GPF的应用增加了基碳排放,冷启动条件提高了整体I/SVOC排放.
- 包括氧化IVOCs在内的SOA预测偏差得到了高达38.2%的纠正.
结论:
- GDI发动机显著改变排放的I/SVOCs的氧化状态.
- GPF和冷启动条件影响I/SVOC物种化和排放水平.
- 对氧化IVOC的准确表征对于改进SOA建模和排放控制策略至关重要.
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