文献类型：期刊文献

英文题名：Hydrogenation behaviors and structural variations of subfraction of coal tar pitch and preparation of mesophases with well-developed optical textures

作者：Qi, Mengyao[1];Huang, Sheng[1];Nurlanbek, Baker[1];Teng, Tao[1];Liang, Jianxu[1];Wang, Song[1];Wu, Shiyong[1,2];Wu, Youqing[1];Bai, Yonghui[2];Gao, Jinsheng[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Ningxia Univ, State Key Lab High Efficiency Utilizat Coal & Gree, Yinchuan 750021, Peoples R China

年份：2024

卷号：177

外文期刊名：JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001177612900001)】；

基金：We gratefully acknowledge financial support of this work by the National Key R & D Program of China (Grant Nos. 2022YFB4101300) , the National Natural Science Foundation of China (Grant Nos. 21978091) and State Key Laboratory of High -efficiency Utilization of Coal and Green Chemical Engineering (Grant No. 2022-K02) .

语种：英文

外文关键词：Coal tar pitch; Hydrogenation; Mesophase; Optical texture

摘要：The heavy fraction (P-A) and the medium fraction (P-B) of coal tar pitch (CTP) were independently hydrogenated by tetrahydronaphthalene (THN) and then blended with the light fraction (P-C) of CTP to obtain modified pitches, from which a fully developed mesophase was prepared. The polycondensation behavior of the hydrogenated fractions and their influence on modified pitches forming mesophase were investigated. The results showed that after P-A fraction was hydrogenated by 10-40 wt% of THN, the H/C atomic ratio increased from 0.57 to 0.59-0.65, precisely as the content of naphthenic structures increased with the condensation index increasing from 0.488 to 0.568. For the hydrogenated P-B, when the ratio of THN increased from 5 wt% to 15 wt %, the alkyl side chains tended to shorten and then grow with their average chain length parameter L decreasing from 3.95 of P-B to 3.81 and then increasing to 4.46. The content of mesophase prepared from modified pitch ranged from 64.33% to 85.65%, in consequence of obvious synergistic effect of the hydrogenated P-A and P-B. Benefiting from the similar condensation degree and average chain length between hydrogenated P-A and P-B, the mesophase content of modified pitches reached 85.65%, including 75.96% of the fiber and flaky textures. The polycondensation reaction between fractions with similar molecular structure proceeds uniformly and smoothly in a well-flowing pitch matrix, resulting in a high content of wide-area mesophase ultimately, which can lay the foundation for the subsequent preparation of high-performance carbon materials.