Oxidation and nanostructural characterization of exhaust particulates from gasoline/diesel dual-fuel combustion
Oxidation and nanostructural characterization of exhaust particulates from gasoline/diesel dual-fuel combustion
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汽油/柴油双燃料燃烧废气颗粒的氧化和纳米结构表征
DOI：
10.1016/j.fuel.2021.120837
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发表时间：
2021-08
期刊：
影响因子：
7.4
通讯作者：
Dongxing Wang
中科院分区：
文献类型：
--
作者：
Xiaochen Wang;Ying Wang;Yuanqi Bai;Funan Guo;Dongxing Wang
汽油/柴油双燃料燃烧是同时降低颗粒物和氮氧化物排放的有效途径。然而，这样的燃烧模式如何影响碳烟氧化反应性和相关特征并不为人所知。研究了汽油/柴油双燃料发动机燃用20%和40%预混替代汽油（分别为G20和G40）时，不同转速下碳颗粒物排放的物理化学特性。热重（TG）结果表明，在两种转速下，双燃料颗粒物比柴油颗粒物更容易被氧化，挥发性有机物（VOF）含量也更高，G40 > G20 >柴油。此外，颗粒在较低的发动机转速表现出较高的氧化反应性和VOF。从双燃料燃烧样品表现出无序的纳米结构，其特征在于较短的条纹长度，但较大的曲折度从高分辨率透射电子显微镜图像和较高的ID 1/IG和AD 1/AG值从拉曼光谱。结构-性能关系表明，双燃料碳烟纳米结构中更多的无定形性质带来了氧化反应性的增加。然而，在这项工作中，通过X射线光电子能谱得到的表面氧含量不是一个显着的指标影响烟灰氧化反应。
It is commonly accepted that gasoline/diesel dual-fuel combustion is an effective path to simultaneously reduce particulate matter and nitrogen oxides. However, how such a combustion mode affects soot oxidation reactivity and related features is not well known. This work focused on physicochemical characteristics of carbonaceous particulates emitted by a gasoline/diesel dual-fuel engine with 20% and 40% gasoline premixed substitutions (G20 and G40, respectively), under different engine speeds. Thermogravimetric (TG) results showed that under both engine speeds, particles from dual-fuel combustion were easier to be oxidized and had higher volatile organic fraction (VOF) than diesel particles, following the order G40 > G20 > diesel. Also, particles at lower engine speed exhibited higher oxidation reactivity and VOF. Samples from dual-fuel combustion exhibited a disordered nanostructure, characterized by shorter fringe length but larger tortuosity from high-resolution transmission electron micrograph images and higherID1/IGandAD1/AGvalues from Raman spectroscopy. The structure–property relationship showed that more amorphous nature in the nanostructure of dual-fuel soot brought about the increase in oxidative reactivity. However, surface oxygen content obtained by X-ray photoelectron spectroscopy was not a significant indicator affecting soot oxidation reactivity in this work.
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