文献类型：期刊文献

英文题名：Effect of hydrothermal treatment on the structure and pyrolysis product distribution of Xiaolongtan lignite

作者：Liu, Peng[1];Wang, Lanlan[2];Zhou, Yang[1];Pan, Tieying[2];Lu, Xilan[1];Zhang, Dexiang[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Dept Chem Engn Energy Resources, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Anal & Res Ctr, Shanghai 200237, Peoples R China

年份：2016

卷号：164

起止页码：110

外文期刊名：FUEL

收录：;EI(收录号：20154201412186);WOS:【SCI-EXPANDED(收录号:WOS:000363476000014)】；

基金：The authors are grateful to the National Key Basic Research Development Program of China (973 Program, No. 2011CB201304) for their financial support.

语种：英文

外文关键词：Lignite; Hydrothermal treatment; Tar yield; Pyrolysis product; Carbon structure

摘要：Hydrothermal treatment of Xiaolongtan lignite (XLT) was carried out in a lab autoclave and the pyrolysis was studied in a tube reactor at 873 K for 15 min. The structure of the lignite was characterized by solid state C-13 nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The results show that the lignite structure and pyrolysis product distribution have a significant change after hydrothermal treatment. Hydrothermal treatment is divided into three stages with the temperature increasing. The oxygen functional groups decompose and substituted by hydrogen in the first stage (<493 K). The pyrolysis tar yields increase from 7.97 wt.% of XLT to 9.60 wt.% of XLT-493 and the pyrolysis water decreases. In the second stage (493-533 K), hydrothermal treatment disrupts the weak covalent bond such as ether, ester and side-chain substituent by hydrolysis. Meanwhile, hydrogen transfer takes place between water and lignite or among the intra-molecular structure lead to increment of the CH2/CH3 ratio. The pyrolysis tar yields increase to 9.76 wt.% of XLT-513 and the pyrolysis water decreases sequentially. Then, the pyrolysis water increases and pyrolysis tar decreases because of the obvious increment of the oxygen-linked aromatic carbon and little increase of the ratio of CH2/CH3. The pyrolysis water and tar decrease subsequently in the third stage (>533 K) as the result of the cleavage of covalent bonds. (C) 2015 Elsevier Ltd. All rights reserved.