TY - JOUR
T1 - Physicochemical characteristics of particulate matter emitted by diesel blending with various aromatics
AU - Wang, Xiaochen
AU - Wang, Ying
AU - Guo, Funan
AU - Wang, Dongxing
AU - Bai, Yuanqi
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/9/1
Y1 - 2020/9/1
N2 - 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/IG and AD1/AG values 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.
AB - 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/IG and AD1/AG values 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.
KW - Aromatics addition
KW - Diesel exhaust particles
KW - Nanostructure
KW - Soot reactivity
UR - https://www.scopus.com/pages/publications/85089367323
U2 - 10.1016/j.fuel.2020.117928
DO - 10.1016/j.fuel.2020.117928
M3 - 文章
AN - SCOPUS:85089367323
SN - 0016-2361
VL - 275
JO - Fuel
JF - Fuel
M1 - 117928
ER -