Experimental investigation into the oxidation reactivity and nanostructure of particulate matter from diesel engine fuelled with diesel/polyoxymethylene dimethyl ethers blends.
Experimental investigation into the oxidation reactivity and nanostructure of particulate matter from diesel engine fuelled with diesel/polyoxymethylene dimethyl ethers blends.
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DOI：
10.1038/srep37611
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发表时间：
2016-11-23
影响因子：
4.6
通讯作者：
Kou G
中科院分区：
文献类型：
--
作者：
Yang H;Li X;Wang Y;Mu M;Li X;Kou G
研究了柴油/聚甲醛二甲醚（PODEn）混合燃料（P0、P10和P20）对柴油机排放颗粒物（PM）的氧化反应性和纳米结构特性的影响。使用金属过滤器从排气歧管收集PM。采用热重分析（TGA）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和拉曼光谱对所收集的PM样品进行了表征。热重分析结果表明，P20产生的PM具有最高的水分和挥发性含量，以及最快的固体碳氧化速率，其次是P10和P0衍生的PM。SEM分析表明，从P20产生的PM是松散的，与从P10和P0排放的PM的平均值较低。高分辨率TEM图像的定量分析表明，条纹长度随着PODEn浓度的增加而沿着减小，并且随着分离距离和弯曲度的增加而减小。这些趋势改善了氧化反应性。根据拉曼光谱数据，强度，半峰全宽和强度比的频带也发生了变化，表明PM纳米结构的无序与更快的氧化速率。结果表明，PODEn的使用影响的氧化反应性和纳米结构的PM，更容易氧化。
This paper focuses on oxidation reactivity and nanostructural characteristics of particulate matter (PM) emitted from diesel engine fuelled with different volume proportions of diesel/polyoxymethylene dimethyl ethers (PODEn) blends (P0, P10 and P20). PM was collected using a metal filter from the exhaust manifold. The collected PM samples were characterized using thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The TGA results indicated that the PM produced by P20 had the highest moisture and volatility contents and the fastest oxidation rate of solid carbon followed by P10 and P0 derived PM. SEM analysis showed that PM generated from P20 was looser with a lower mean value than PM emitted from P10 and P0. Quantitative analysis of high-resolution TEM images presented that fringe length was reduced along with increased separation distance and tortuosity with an increase in PODEn concentration. These trends improved the oxidation reactivity. According to Raman spectroscopy data, the intensity, full width at half-maximum and intensity ratio of the bands also changed demonstrating that PM nanostructure disorder was correlated with a faster oxidation rate. The results show the use of PODEn affects the oxidation reactivity and nanostructure of PM that is easier to oxidize.
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