Influence of the Pyrolytic Temperature on the Carbon Structure of the α Fraction from Coal Tar Pitch: EPR and NMR Spectroscopy

IF 0.4 Q4 ENGINEERING, CHEMICAL

Coke and Chemistry Pub Date : 2024-10-23 DOI:10.3103/S1068364X24600623

N. S. Zakharov, O. M. Gavrilyuk, S. A. Sozinov, A. P. Nikitin

引用次数: 0

Abstract

The processes occurring in low-temperature pyrolysis of the α fraction of coal tar pitch over the range 25–700°C are studied by electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) spectroscopy. Up to 400°C, a sequence of processes occurs: homolytic rupture of C–C and C–H bonds is followed by recombination of aromatic π radicals to form graphite-like structures. At the threshold temperature (500°C), recombination of aromatic radicals begins to predominate. Comparison of the results with literature data indicates that, in the range 400–700°C, disordered graphite-like structures are formed. Available physicochemical methods permit detailed study of such structures.

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热解温度对煤焦油沥青 α 馏分碳结构的影响：EPR 和 NMR 光谱分析

通过电子顺磁共振（EPR）和核磁共振（NMR）光谱研究了煤沥青 α 部分在 25-700°C 范围内的低温热解过程。在高达 400°C 的温度下，会发生一系列过程：C-C 键和 C-H 键发生同解断裂，随后芳香族 π 自由基发生重组，形成类似石墨的结构。在临界温度（500°C）下，芳香族自由基的重组开始占主导地位。与文献数据的比较结果表明，在 400-700°C 的范围内，会形成无序的类石墨结构。现有的物理化学方法可以对这种结构进行详细研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Coke and Chemistry ENGINEERING, CHEMICAL-

CiteScore

0.70

自引率

50.00%

发文量

期刊介绍： The journal publishes scientific developments and applications in the field of coal beneficiation and preparation for coking, coking processes, design of coking ovens and equipment, by-product recovery, automation of technological processes, ecology and economics. It also presents indispensable information on the scientific events devoted to thermal rectification, use of smokeless coal as an energy source, and manufacture of different liquid and solid chemical products.