文献类型：期刊文献

英文题名：Correlation of Mesophase Properties with Molecular Structures of Pitches from Different Sources

作者：Qi, Mengyao[1];Huang, Sheng[1];Baker, Nurlanbek[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：38

期号：4

起止页码：2855

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20240715546168);WOS:【SCI-EXPANDED(收录号:WOS:001158982100001)】；

基金：We gratefully acknowledge financial support of this work by the National Key R&D Program of China (Grant no. 2022YFB4101300), the National Natural Science Foundation of China (Grant no. 22378129), and the 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：Aromatic compounds - Aromatization - Coal liquefaction - Coal tar - Molecular structure - Structural properties

摘要：In this paper, the molecular structures of vacuum residue (VR), coal liquefaction pitch (CLP), and coal tar pitch (CTP) are presented in detail, in order to explore their connection with mesophase properties. It is found that the H/C atom ratio of VR is as high as 1.32 because of abundant aliphatic structures. Its average aromatic ring number (R (A)) is only 3.88, and some of its internal aromatic rings are connected by bridged bonds. The mesophase pitch from VR (MP-VR) has a low mesophase content of 28.28-40.7% and is mostly of fiber texture. CTP has a degree of aromaticity (f (a)) of 0.90 and an R (A) of 10.65. The polycyclic aromatic molecule has only a few alkyl substituents at the periphery, resulting in a low H/C atom ratio of 0.56. The mesophase pitch from CTP (MP-CTP) has a mesophase content of 31.5-53.9% and has a distinct mosaic texture. CLP has the largest average molecular structure unit size, with an R (A) of 12.33 and a large degree of condensation. It contained certain cycloalkane structure and methyl substituents. The mesophase pitch from CLP (MP-CLP) has a mesophase content of 43.3-54.4% and contains abundant fiber and flaky textures. The regular and compact lamellar arrangement of planar aromatic macromolecules gives MP-CLP better graphitization properties, thermal stability, and rheological properties than MP-VR and MP-CTP.