Microcrystal Structure and C/O Element Occurrence State of Diesel PM by Non-Thermal Plasma Oxidation at Different Reaction Temperatures.
Microcrystal Structure and C/O Element Occurrence State of Diesel PM by Non-Thermal Plasma Oxidation at Different Reaction Temperatures.
复制标题
不同反应温度下非热等离子体氧化柴油机PM的微晶结构和C/O元素赋存状态。
DOI：
10.1007/s12239-021-0147-7
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Zhu Kan
中科院分区：
文献类型：
--
作者：
Lu Yirui;Shi Yunxi;Cai Yixi;Fan Runlin;Zhu Lei;Zhu Kan
揭示反应温度对以氧气为气源的非热等离子体（NTP）还原柴油颗粒物（PM）的影响。利用拉曼光谱和x射线光电子能谱研究了不同温度下NTP氧化前后PM的微晶结构和元素态的变化。经NTP氧化后，PM微晶结构和非晶碳结构的无序性降低。D1和D3峰的半峰全宽（FWHM）减小，G峰的FWHM略有增加。在PM氧化过程中，碳微晶生长并发生重构，PM的石墨化程度提高。NTP氧化后，随着反应温度的升高，PM中O的含量增加，导致O与C的结合形式由C-O逐渐变为C=O。升温对NTP氧化活性的促进作用随着NTP活性物质的热分解而逐渐减弱。随着反应温度的变化，PM的微晶结构和C、O的存在状态发生了变化，说明不同反应温度下NTP对PM的氧化性不同。
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.