Low-Temperature Oxidation of Diesel Particulate Matter Using Dielectric Barrier Discharge Plasma

IF 2.6 3区物理与天体物理 Q3 ENGINEERING, CHEMICAL

Plasma Chemistry and Plasma Processing Pub Date : 2024-07-10 DOI:10.1007/s11090-024-10492-6

Baoyong Ren, Tiantian Zhang, Zuliang Wu, Jing Li, Erhao Gao, Wei Wang, Jiali Zhu, Shuiliang Yao

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Abstract

The oxidation behavior of actual diesel particulate matter (DPM) prepared from diesel combustion was studied using a dielectric barrier discharge (DBD) reactor. The primary oxidation temperature (T₃₀ at which 30% of DPM was oxidized) was reduced from 524 °C (with non-discharge, NDC) to 409 °C with discharge (DC). It was found that the dry soot (DS) from DPM after dichloromethane extraction was more difficult to be oxidized than DPM due to the loss of soluble organic fraction (SOF) from DPM. The order of activation energies of DPM and DS under conditions of DC and NDC is: DPM–DC < DPM–NDC < DS–DC < DS–NDC. The intermediates of DPM oxidation at different temperatures, pulse peak voltages and reaction gas atmospheres were investigated via operando DRIFTS–MS. It is found that under DC, SOF can be oxidized to oxygen containing compounds (OCC) at low temperatures, and a higher pulse peak voltage is beneficial to DPM oxidation. The main product of 10 vol% O₂/N₂ discharge gas is high valence nitrogen oxides like NO₂, which participates in DPM oxidation. DBD plasma enhances DPM oxidation primarily through two mechanisms: first, by ionizing O₂ to produce strong oxidizing substances, and second, by inhibiting the increasing content of graphitized components. This study provides a comprehensive understanding of DPM oxidation kinetics and intermediates under DBD plasma.

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利用介质阻挡放电等离子体低温氧化柴油微粒物质

使用介质阻挡放电（DBD）反应器研究了从柴油燃烧中制备的实际柴油微粒物质（DPM）的氧化行为。初级氧化温度（30% 的 DPM 被氧化时的 T30）从 524 ℃（非放电，NDC）降至放电 (DC) 时的 409 ℃。研究发现，从二氯甲烷萃取后的 DPM 中提取的干烟尘 (DS) 比 DPM 更难被氧化，原因是 DPM 中的可溶性有机成分 (SOF) 丢失了。在 DC 和 NDC 条件下，DPM 和 DS 的活化能顺序为DPM-DC < DPM-NDC < DS-DC < DS-NDC。通过操作型 DRIFTS-MS 研究了不同温度、脉冲峰值电压和反应气体氛围下 DPM 氧化的中间产物。研究发现，在直流条件下，SOF 可在低温下氧化成含氧化合物 (OCC)，而较高的脉冲峰值电压有利于 DPM 氧化。10 vol% O2/N2 放电气体的主要产物是高价氮氧化物，如 NO2，它参与了 DPM 氧化。DBD 等离子体主要通过两种机制增强 DPM 氧化：一是通过电离 O2 产生强氧化物质，二是通过抑制石墨化成分含量的增加。这项研究提供了对 DBD 等离子体下 DPM 氧化动力学和中间产物的全面了解。

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来源期刊

Plasma Chemistry and Plasma Processing 工程技术-工程：化工

CiteScore

5.90

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.