| MICROCRYSTAL STRUCTURE AND C/O ELEMENT OCCURRENCE
STATE OF DIESEL PM BY NON-THERMAL PLASMA OXIDATION AT
DIFFERENT REACTION TEMPERATURES |
| Yirui Lu1, Yunxi Shi1, Yixi Cai1, Runlin Fan1, Lei Zhu2, Kan Zhu1 |
1Jiangsu University
2Kailong High Technology Co., Ltd |
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| ABSTRACT |
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To reveal the effect of reaction temperature on the reduction of diesel particulate matter (PM) by non-thermal
plasma (NTP) using oxygen as a gas source. The changes in the microcrystalline structure and the elemental state of PM
before and after NTP oxidation at different temperatures were explored by Raman and X-ray photoelectron spectroscopy.
After NTP oxidation, the disorder in the PM microcrystal structure and the amorphous carbon structure was reduced. The full
width at half maximum (FWHM) of the D1 and D3 peaks decreased, and the FWHM of the G peak increased slightly. During
the oxidation of PM, the carbon microcrystals grew and became restructured, and the graphitization of PM increased. After
NTP oxidation, the content of O in PM increased as the reaction temperature increased, resulting in a gradual change in the
binding form of O with C from C-O to C=O. The ability of temperature rise to promote the oxidation activity of NTP was
gradually weakened for the thermal decomposition of NTP active substances. The microcrystalline structure and the
occurrence state of C and O of PM changed with reaction temperature, indicating that the oxidizability of NTP on PM
differed at different reaction temperatures. |
| Key Words:
Diesel engine, Particulate filter, Non-thermal plasma, Microstructure, Occurrence state |
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Corresponding Author.
Yunxi Shi , Email. 
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