Three-dimension soft X-ray tomographic reconstruction of particulates emitted from a diesel engine

Yan, Fangchao; Song, Jinou; Zhuang, Yuan; Qiu, Liang; Li, Zhijun; Meng, Zhongwei

doi:10.1016/j.jaerosci.2021.105784

Cited by 8 publications

(6 citation statements)

References 35 publications

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“…The shape and structure of PM produced by diesel engine are irregular and complex 33 – 35 . The fractal dimension D f was proposed to describe the degree of density and the degree of geometric structure irregularity among the basic carbon particles of PM 36 – 40 .…”

Section: Test Device and Methodsmentioning

confidence: 99%

Effect of nano-graphene lubricating oil on particulate matter of a diesel engine

Kuang,

Yang,

et al. 2024

Sci Rep

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Nano-graphene lubricating oil with appropriate concentration shows excellent performance in reducing friction and wear under different working conditions of diesel engines, and has been widely concerned. Lubricating oil has a significant impact on particulate matter (PM) emissions. At present, there are few studies on the impact of nano-graphene lubricating oil on the physicochemical properties of PM. In order to comprehensively evaluate the impact of nano-graphene lubricating oil on diesel engines, this paper mainly focused on the effects of lubricating oil nano-graphene additives on the particle size distribution and physicochemical properties of PM. The results show that, compared with pure lubricating oil, the total number of nuclear PM and accumulated PM of nano-graphene lubricating oil is significantly increased. The fractal dimension of PM of nano-graphene lubricating oil increases and its structure becomes more compact. The average fringe separation distance of basic carbon particles decreases, the average fringe length increases. The degree of ordering and graphitization of basic carbon particles are higher. The fringe tortuosity of basic carbon particles decreases, and the fluctuation of carbon layer structure of basic carbon particles decreases. Aliphatic substances in PM are basically unchanged, aromatic components and oxygen functional groups increase. The initial PM oxidation temperature and burnout temperature increase, the maximum oxidation rate temperature and combustion characteristic index decrease, and the activation energy increases, making it more difficult to oxidize. This was mainly caused by the higher graphitization degree of PM of nano-graphene lubricating oil and the increased content of aromatic substances.

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Section: Test Device and Methodsmentioning

confidence: 99%

Effect of nano-graphene lubricating oil on particulate matter of a diesel engine

Kuang,

Yang,

et al. 2024

Sci Rep

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“…This indicates that the outer shell, composed of graphitic crystallites, is of a rigid structure, while the inner core is chemically and structurally less stable due to the thermodynamic instability of its structure. Yan et al 40 were able to directly observe the microstructure of diesel PM particles and found them to be fractal-like agglomerates of soot coated with condensed organic compounds, while the agglomerates were constituted by loosely attached aggregates. Van Gulijk et al 41 measured parameter of fractal-like agglomerates and incorporated them into a model to make a useful comparison.…”

Section: Morphological Investigationsmentioning

confidence: 99%

Morphological characterization of soot from a compression ignition engine fueled with diesel and an oxygenated fuel

Sharma

Preuß

Sjöblom

2022

International Journal of Engine Research

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Compression ignition (CI) engines are highly efficient and are therefore often the first choice in application of heavy machinery and heavy duty vehicles. However, diesel engines are known to emit soot and oxides of nitrogen (NOx) emission. Replacing fossil diesel fuel with renewable fuel is one possibility to reduce emissions and to meet legislative requirements. In this experimental work, an oxygenated fuel blend was investigated for soot morphology and results were compared with fossil diesel fuel without oxygenates. Soot was sampled at a medium load case in a light duty single cylinder research engine and samples were analyzed with a transmission electron microscope (TEM). Furthermore, combustion characteristics and particle number (PN) emissions were compared for both fuels. The primary particle diameter (Dp), fringe length (L), fringe separation (S), and tortuosity (T) were also discussed in terms of soot nanostructure. The particle size distribution (PSD) showed a reduction in PN over for the renewable fuel blend compared to diesel. This PN reduction was from 107 to 106 (one order magnitude lower). The maximum Dp from morphological analysis of diesel fuel and renewable fuel was 69.93 and 66.36 nm respectively. Size range of fringe separation (S) was nearly identical for both fuels. Diesel fuel has marginally higher fringe separation, fringe length, and tortuosity. This investigation is valuable for fuel industries which are continuously upgrading renewable and oxygenated fuels to meet stringent emission norms.

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“…Owing to the high thermal efficiency and durability, diesel engines are widely applied in transportation and road construction field. However, soot particles emitted from diesel engines not only cause severe environment pollution, but also harm human health, especially the small diesel particulate matters could cause lung cancer and cardiovascular diseases when they enter human respiratory tract [1] . With the more and more strict legislation to limit the emission of soot particulates, diesel engine soot emission control technology has become the focus of the government and attracted much attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

“…However, soot particles emitted from diesel engines not only cause severe environment pollution, but also harm human health, especially the small diesel particulate matters could cause lung cancer and cardiovascular diseases when they enter human respiratory tract. [1] With the more and more strict legislation to limit the emission of soot particulates, diesel engine soot emission control technology has become the focus of the government and attracted much attention in recent years. The catalytic diesel particulate filter (CDPF) combinating the filtration and catalytic oxidation of soot is considered to be one of the most effective soot elimination technologies.…”

Section: Introductionmentioning

confidence: 99%

Fe‐Ce Composite Oxide Catalysts Supported on 3D Nickel Foam for Catalytic Oxidation of Soot

Wang

Shi

et al. 2022

ChemistrySelect

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To reduce the combustion temperature of diesel soot, the FeÀ Ce composite oxide catalysts with varying composition supported by three-dimensional nickel foams were prepared by hydrothermal reaction and impregnation method. The internal structure and performance of the monolithic catalysts were characterized by X-ray diffraction, Raman, scanning electron microscope, X-ray photoelectron spectroscopy and catalyst activity evaluation techniques. The results revealed that when the molar ratio of Ce and Fe was 0.5, the CeO 2 /Fe 2 O 3 @NF catalyst showed the best catalytic activity of soot oxidation, good stability and water resistance. Besides, the addition of NO and H 2 O was helpful to improve the catalytic performance for soot oxidation, when 10 % H 2 O and 800 ppm NO were mixed into 20 %O 2 /N 2 atmosphere, the T 10 , T 50 and T 90 values could decrease to 299 °C, 344 °C and 389 °C, respectively.

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Three-dimension soft X-ray tomographic reconstruction of particulates emitted from a diesel engine

Cited by 8 publications

References 35 publications

Effect of nano-graphene lubricating oil on particulate matter of a diesel engine

Effect of nano-graphene lubricating oil on particulate matter of a diesel engine

Morphological characterization of soot from a compression ignition engine fueled with diesel and an oxygenated fuel

Fe‐Ce Composite Oxide Catalysts Supported on 3D Nickel Foam for Catalytic Oxidation of Soot

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