Study on Nanostructure and Oxidation Reactivity of Diesel Engine Exhaust Particulates Burning Methanol/F-T Diesel

Yan Hua, Junjun Jin (), Meijuan Zhang, Jialong Zhu, Ruina Li and Shuai Liu
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Yan Hua: School of Automobile and Traffic Engineering, Wuxi University of Technology, Wuxi 214121, China
Junjun Jin: School of Automobile and Traffic Engineering, Wuxi University of Technology, Wuxi 214121, China
Meijuan Zhang: School of Automobile and Traffic Engineering, Wuxi University of Technology, Wuxi 214121, China
Jialong Zhu: School of Automobile and Traffic Engineering, Wuxi University of Technology, Wuxi 214121, China
Ruina Li: School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212203, China
Shuai Liu: School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212203, China

Energies, 2025, vol. 18, issue 21, 1-24

Abstract: In this study, the exhaust particulates of a diesel engine burning methanol/F-T diesel blends were collected. The nanostructure and oxidation reactivity of the particulates were explored using the Brunauer–Emmett–Teller (BET) method, high-resolution transmission electron microscope (HRTEM), and thermogravimetric analysis (TGA), and the relationship between them was assessed via the partial least squares (PLS) and variable importance in the projection (PLS-VIP). The results showed that particulates from methanol/F-T diesel combustion were aggregates composed of several primary particles, and the distribution range of particulate half pore width ( R ) was 8~76 nm. As the methanol mixture ratio increased, the mean R of particulates decreased, and the particulates′ total pore volume ( V p ), specific surface area ( S B E T ), and the fractal dimension ( D f ) increased. Compared with F-T diesel, methanol/F-T diesel blends particulates showed more disordered structure with a smaller diameter ( d p ) of primary particles, a shorter fringe length ( L a ), a wider separation distance ( d ), and a larger tortuosity ( T f ). With increasing the methanol mixture ratio, it was also found that the amount of soluble organic fraction (SOF) of particulates increased, while oxidation characteristic temperature and the apparent activation energy ( E a ) reduced. The correlation coefficients of E a with T f and D f were 0.99 and 0.98, respectively, by the linear fitting, illustrating that they showed the strongest linear relationship with the reactivity among the discussed nanostructure parameters. The VIP values of D f , T f , V p , and d , with E a obtained by the PLS and PLS-VIP, were greater than 1, indicating that they were the chief factors influencing particulate reactivity.

Keywords: methanol blend; coal-based fuel; particle; morphology; physicochemical property (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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