文献类型：期刊文献

英文题名：Effects of hydrothermal treatment on physico-chemcial structures and liquefaction behaviors of lignite

作者：Li, Huan[1];Wu, Shiyong[1];Wu, Youqing[1];Wang, Haiqi[1];Zhang, Zhimiao[1];Huang, Sheng[1];Gao, Jinsheng[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Dept Chem Engn Energy Resources, Shanghai 200237, Peoples R China

年份：2020

卷号：263

外文期刊名：FUEL

收录：;EI(收录号：20194907788659);WOS:【SCI-EXPANDED(收录号:WOS:000504834400037)】；

基金：This work was supported by National Natural Science Foundation of China, China (Grant No. 2197080732, 21878096), the Fundamental Research Funds for the Central Universities, China (Grant No. 222201718003), the National Key Basic Research and Development Program of China, China (Grant No. 2018YFB0604602)

语种：英文

外文关键词：Lignite liquefaction; Hydrothermal treatment; Structure characteristics; Liquefaction oil

摘要：The effects of hydrothermal treatment on physico-chemcial structures and liquefaction behaviors of lignite were studied in this paper. The lignite after demineralization was hydrothermally pretreated at 70-280 degrees C under N-2 atmosphere, and physico-chemcial structures of pretreated coal were determined. The results showed that hydrothermal treatment at 130-190 degrees C could inhibit the reduction of H and O contents and the decomposition of carboxyl groups and phenolic hydroxyl groups in lignite. It was also beneficial to the increase of H content, the formation of mesopores, and decomposition of C-O in lignite. After hydrothermal treatment, the pretreated coal was liquefied at 430 degrees C under H-2 atmosphere. The results showed that the yields of preasphaltene (PA) and oil of pretreated coal at appropriate temperatures (130-190 degrees C) were higher than those of demineralized coal. These indicated that the hydrothermal treatment played positive roles in the formation of PA, and conversion of asphaltene (AS) to low molecular compounds. The components of liquefaction oil showed that hydrothermal treatment could promote the transfer from polycyclic aromatic hydrocarbons to monocyclic aromatic hydrocarbons, thus leading to a decrease in molecular weight of liquefaction oil. During the liquefaction process, the increases of pore volume and surface area were beneficial to hydrogen transfer, thus improving the liquefaction activity of lignite.