Analysis of the microstructure and elemental occurrence state of residual ash-PM following DPF regeneration by injecting oxygen into non-thermal plasma

Yunxi SHI (施蕴曦); Yirui LU (卢奕睿); Yixi CAI (蔡忆昔); Yong HE (何勇); Yin ZHOU (周银); Yingxin CUI (崔应欣); Haoming SUN (孙浩铭)

doi:10.1088/2058-6272/ac1058

Plasma Science and Technology > 2021 > 23(9): 95504-095504. > DOI: 10.1088/2058-6272/ac1058

Yunxi SHI (施蕴曦), Yirui LU (卢奕睿), Yixi CAI (蔡忆昔), Yong HE (何勇), Yin ZHOU (周银), Yingxin CUI (崔应欣), Haoming SUN (孙浩铭). Analysis of the microstructure and elemental occurrence state of residual ash-PM following DPF regeneration by injecting oxygen into non-thermal plasma[J]. Plasma Science and Technology, 2021, 23(9): 95504-095504. DOI: 10.1088/2058-6272/ac1058

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Analysis of the microstructure and elemental occurrence state of residual ash-PM following DPF regeneration by injecting oxygen into non-thermal plasma

¹ School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China
² Vehicle Measurement, Control and Safety Key Laboratory of Sichuan Province, School of Automobile and Transportation, Xihua University, Chengdu 610039, People's Republic of China

Funds: This work is currently supported by National Natural Science Foundation of China (No. 51806085), China Postdoctoral Science Foundation (No. 2018M642175), Jiangsu Planned Projects for Postdoctoral Research Fund (No. 2018K101C), Open Research Subject of Key Laboratory of automotive measurement, control and safety (Xihua University) (No. QCCK2021-007) and Graduate Student Innovation Fund Project of Jiangsu Province (No. KYCX21_3354).

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Received Date: February 25, 2021
Revised Date: June 22, 2021
Accepted Date: June 28, 2021

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Abstract

Abstract

Particulate matter (PM) capture tests were carried out on clean diesel particulate filters (DPFs) under different loads (25%, 50%, 75% and 100%). DPFs were regenerated by a non-thermal plasma (NTP) injection device. Raman spectroscopy and x-ray photoelectron spectroscopy were used to investigate changes in the microstructure and element occurrence state of the sediment in DPF channel before and after regeneration. The order of the PM samples decreased before NTP treatment as the load increased; the amorphous carbon content was high, and the oxidation activity was higher. After NTP treatment, the carbon atoms at the edge of the microcrystalline structure in the ash-PM samples were oxidized, and the structure was reorganized; in addition, the amorphous carbon content decreased, and the structure was more diversified. Before NTP, the C element of PM samples was the main component, and the content of the O element was relatively low. The C element occurred in the form of C–C, C–OH, and O–C=O functional groups, and O atoms were mainly combined with C–O. After NTP, the content of Na, P, S, Ca, and other inorganic elements in ash-PM samples was prominent because C atoms were removed by NTP active substances. There were two forms of S element occurrence (SO₄²⁻ and SO₃²⁻); the proportion of SO₄²⁻ was approximately 40%, and the proportion of SO₃²⁻ was approximately 60%. Study of the microstructure and element occurrence of the residues in the DPF channels improved our understanding of the mechanism of the low-temperature regeneration of DPF from NTP.
- diesel particulate filter,
- regeneration,
- non-thermal plasma,
- ash-PM,
- microstructure,
- occurrence state

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References (56)

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