Physicochemical characteristics of particulate matter emitted by diesel blending with various aromatics
Physicochemical characteristics of particulate matter emitted by diesel blending with various aromatics
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柴油与各种芳烃掺合排放颗粒物的理化特性
DOI：
10.1016/j.fuel.2020.117928
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发表时间：
2020-09
期刊：
影响因子：
7.4
通讯作者：
Yuanqi Bai
中科院分区：
文献类型：
--
作者：
Xiaochen Wang;Ying Wang;Funan Guo;Dongxing Wang;Yuanqi Bai
为研究柴油机排气颗粒物的芳烃结构对颗粒物理化性质的影响，采用高分辨透射电镜（HR-TEM）、拉曼光谱（RS）、X射线光电子能谱（XPS）和热重分析（TGA）等方法对柴油及其与苯、间二甲苯和四氢萘的混合物排放的颗粒物进行了表征。结果表明，柴油碳烟的反应活性最低，其次是柴油/四氢萘碳烟，后者的反应活性低于柴油/间二甲苯和柴油/苯碳烟。在这方面，具有高比例的芳族化合物，特别是单芳族化合物的柴油燃料需要较低的热能输入用于柴油机颗粒过滤器（DPF）再生。柴油/芳烃烟灰的较高反应性与较不有序的纳米结构一致。高分辨透射电镜（HRTEM）的条纹参数表明，碳烟颗粒的条纹长度按柴油>柴油/四氢萘>柴油/间二甲苯>柴油/苯的顺序减小，而条纹弯曲度和间距则与条纹长度呈相反的趋势。值得注意的是，燃料配方对条纹参数的影响是轻微的。此外，ID 1/IG和AD 1/AG值均显示柴油碳烟比柴油/芳烃碳烟具有更大的有序结构。柴油/芳烃碳烟的平均一次粒径大于纯柴油碳烟的平均一次粒径。与芳烃混合后，颗粒样品中挥发性物质的质量分数增加，而元素碳含量降低。根据XPS，没有观察到表面氧含量（O/C比）和烟灰反应性之间的关系。
To evaluate the effects of aromatics structure on physicochemical features of diesel exhaust particles, particulate samples emitted from diesel fuel and its mixtures with benzene, m-xylene and tetralin were characterized using high-resolution transmission electron microscopy (HR-TEM), Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). Results showed that diesel soot had the least reactivity among four particle samples, followed by diesel/tetralin soot, which the latter was less reactive than diesel/m-xylene and diesel/benzene soot. In this aspect, diesel fuel with high proportion of aromatics, especially monoaromatics, demands lower thermal energy input for diesel particulate filter (DPF) regeneration. Higher reactivity of diesel/aromatics soot was in line with the less ordered nanostructure. Fringe parameters obtained from HRTEM showed that fringe length of soot particles decreased in the order: diesel > diesel/tetralin > diesel/m-xylene > diesel/benzene, while both fringe tortuosity and separation distance exhibited the opposite trend with fringe length. Notably, the effects of fuel formulations on fringe parameters were slight. Moreover, both ID1/IGand AD1/AGvalues revealed that diesel soot had a greater ordered structure than diesel/aromatics soot. The mean primary particle diameters of diesel/aromatics soot were larger than those of soot from pure diesel fuel. After mixing with aromatics, the mass fraction of volatile substances in particle samples increased while elemental carbon contents decreased. According to XPS, no relationship was observed between the surface oxygen content (O/C ratio) and the soot reactivity.
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影响因子：
6.4
作者：
Yong Qian;Y. Qiu;Yahui Zhang;Xingcai Lu
通讯作者：
Yong Qian;Y. Qiu;Yahui Zhang;Xingcai Lu
DOI：
10.4271/2015-01-1829
发表时间：
2015-09
期刊：
--
影响因子：
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通讯作者：
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影响因子：
7.4
作者：
刘野;宋崇林;吕刚;曹晓峰;王林
通讯作者：
王林
影响因子：
6.4
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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