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不同气态等离子体及等离子体处理持续时间对煤结构的影响

Effects of Different Gaseous Plasmas and Plasma Treatment Durations on Coal Structure.

作者信息

Yang Fan, Xue Qingguo, Zuo Haibin, Wang Jingsong

机构信息

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China.

出版信息

ACS Omega. 2025 May 19;10(21):22191-22203. doi: 10.1021/acsomega.5c02556. eCollection 2025 Jun 3.

DOI:10.1021/acsomega.5c02556
PMID:40487994
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12138676/
Abstract

Coal samples were treated with air, N, and O plasmas for varying times to study plasma type and duration effects on coal structural characteristics. FTIR, Raman, and XRD analyses systematically evaluated the chemical structural changes. Results showed plasma type and treatment time significantly impacted coal's aromatic structures, aliphatic configurations, oxygen-containing groups, graphitization degree, aliphatic chain length, and aromatic stacking layers. FTIR parameters ( , , DOC, ) indicated short-term air, N, and O plasma treatments reduced aromaticity while increasing aliphatic groups and oxygen-containing moieties. Short-term plasma reduced crystallographic ordering with air plasma, causing the most pronounced structural changes. XRD revealed plasma-modified aromatic lamella densification via spacing variations. Stacking height ( ) and lateral dimension ( ) contracted initially and then expanded with longer treatment for all plasma types. Aliphatic chain development (evidenced by an increased ) influenced coal reactivity. Rising and values showed an increased graphitization with treatment time. The plasma-induced mechanistic changes in coal macromolecules were elucidated based on these structural alterations. This study first reveals dual-threshold effects of time-dependent plasma treatment on coal graphitization and reactivity.

摘要

对煤样进行不同时间的空气、氮气和氧气等离子体处理，以研究等离子体类型和处理时间对煤结构特征的影响。傅里叶变换红外光谱（FTIR）、拉曼光谱和X射线衍射（XRD）分析系统地评估了化学结构变化。结果表明，等离子体类型和处理时间对煤的芳香结构、脂肪族构型、含氧基团、石墨化程度、脂肪族链长度和芳香堆积层有显著影响。FTIR参数（ 、 、DOC、 ）表明，短期的空气、氮气和氧气等离子体处理降低了芳香性，同时增加了脂肪族基团和含氧部分。短期等离子体处理降低了空气等离子体的晶体有序性，导致最明显的结构变化。XRD显示，通过 间距变化，等离子体改性使芳香薄片致密化。对于所有等离子体类型，堆积高度（ ）和横向尺寸（ ）最初收缩，然后随着处理时间延长而扩大。脂肪族链的发展（以 增加为证）影响了煤的反应性。随着处理时间的增加， 和 值升高表明石墨化增加。基于这些结构变化，阐明了等离子体诱导的煤大分子的机理变化。本研究首次揭示了时间依赖性等离子体处理对煤石墨化和反应性的双阈值效应。

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