Dissolution of Baganuur coal analyzed by electron paramagnetic resonance spectroscopy

IF 2.1 Q2 Physics and Astronomy

Physics Open Pub Date : 2026-05-01 Epub Date: 2026-05-28 DOI:10.1016/j.physo.2026.100431

Munkhtsetseg Sambuu, Uilstuguldur Enkhbaatar, Shilagardi Golimensee

{"title":"Dissolution of Baganuur coal analyzed by electron paramagnetic resonance spectroscopy","authors":"Munkhtsetseg Sambuu, Uilstuguldur Enkhbaatar, Shilagardi Golimensee","doi":"10.1016/j.physo.2026.100431","DOIUrl":null,"url":null,"abstract":"<div><div>Experimental studies have been conducted on the solubility of subbituminous coal from Baganuur, Mongolia, in solutions of conventional organic pyridine and modern, “green”, imidazolium-based ionic liquid [Bmim]Cl.</div><div>EPR spectroscopy is employed to investigate the original material and its extraction process.</div><div>Inertinite-rich Baganuur coal consists of a highly reactive organic fraction of high-gravity ashery residues. As-received coal gives a slightly asymmetric, singlet EPR spectrum at room temperature. After processing with solvents, the inner structure in the spectrum decomposed depending on the used solvent.</div><div>Various forms of free radical generation were noted. Auxiliary experiments are conducted simultaneously for resolving the type of the radical. Among those radicals, the surface oxygen reactive radicals are revealed and annihilated by mild experimental conditions. In-depth analysis from EPR regarding microwave power dependence and line shape illustrates structural changes occurring during the solubility of coal.</div><div>Depending on the solvents used, the newly formed charge-transfer complex remained stable. Analysis of line shape reveals the radical interaction, which is subject to Gaussian and Lorentzian laws. The solubility restriction of studied coal in the solvent is a result of the subsequent formation of radicals as a result of Lorentz lines.</div></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"27 ","pages":"Article 100431"},"PeriodicalIF":2.1000,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics Open","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666032626000645","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/5/28 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"Physics and Astronomy","Score":null,"Total":0}

引用次数: 0

Abstract

Experimental studies have been conducted on the solubility of subbituminous coal from Baganuur, Mongolia, in solutions of conventional organic pyridine and modern, “green”, imidazolium-based ionic liquid [Bmim]Cl.

EPR spectroscopy is employed to investigate the original material and its extraction process.

Inertinite-rich Baganuur coal consists of a highly reactive organic fraction of high-gravity ashery residues. As-received coal gives a slightly asymmetric, singlet EPR spectrum at room temperature. After processing with solvents, the inner structure in the spectrum decomposed depending on the used solvent.

Various forms of free radical generation were noted. Auxiliary experiments are conducted simultaneously for resolving the type of the radical. Among those radicals, the surface oxygen reactive radicals are revealed and annihilated by mild experimental conditions. In-depth analysis from EPR regarding microwave power dependence and line shape illustrates structural changes occurring during the solubility of coal.

Depending on the solvents used, the newly formed charge-transfer complex remained stable. Analysis of line shape reveals the radical interaction, which is subject to Gaussian and Lorentzian laws. The solubility restriction of studied coal in the solvent is a result of the subsequent formation of radicals as a result of Lorentz lines.

Abstract Image

查看原文本刊更多论文

电子顺磁共振波谱分析巴格努尔煤的溶解

对蒙古Baganuur亚烟煤在常规有机吡啶和现代“绿色”咪唑基离子液体[Bmim]Cl溶液中的溶解度进行了实验研究。采用EPR光谱法对原料及其提取工艺进行了研究。巴格努尔煤是由高重灰质残留物的高活性有机组分组成的。接收煤在室温下呈现出略微不对称的单线态EPR谱。用溶剂处理后，光谱中的内部结构根据所用溶剂的不同而分解。注意到自由基生成的各种形式。同时进行辅助实验，以确定自由基的类型。在这些自由基中，表面氧活性自由基在温和的实验条件下被揭示和湮灭。EPR对微波功率依赖性和线形的深入分析说明了煤在溶解过程中发生的结构变化。根据所用溶剂的不同，新形成的电荷转移络合物保持稳定。对线形的分析揭示了径向相互作用，这种相互作用服从高斯定律和洛伦兹定律。所研究的煤在溶剂中的溶解度限制是由于洛伦兹线随后形成自由基的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊