Citation: LIU Peng, ZHOU Yang, LU Xi-lan, WANG Lan-lan, PAN Tie-ying, ZHANG De-xiang. Structural evolution of Xianfeng lignite during hydrothermal treatment[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(02): 129-137. shu

Structural evolution of Xianfeng lignite during hydrothermal treatment

1.
1. Department of Chemical Engineering for Energy Resources, East China University of Science & Technology, Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai 200237, China;
2.
2. Analysis and Research Center, East China University of Science and Technology, Shanghai 200237, China

Corresponding author: ZHANG De-xiang,
Received Date: 14 September 2015
Available Online: 1 November 2015
Fund Project: 国家重点基础研究发展规划(973计划,2011CB201304)项目资助. (973计划,2011CB201304)

Xianfeng lignite(XF) was used as raw material to investigate its structural evolution during hydrothermal treatment in a 500 mL autoclave.The structure was characterized by solid state ¹³C nuclear magnetic resonance(NMR) and Fourier transform infrared spectroscopy(FT-IR).The results show that the carbon contents increase and oxygen contents decrease after hydrotnermal treatment.The weak bonds in lignite are broken and the oxygen functional groups decrease gradually during hydrothermal treatment below 240℃.Hydrogen is donated from water to lignite through ionic pathway and transferred into lignite.The methyl carbon increases at 200℃ and then decreases.The methenyl carbon increases from 4.80% in XF to 13.16% in XF-240.The released gas is mainly CO₂ during hydrothermal treatment.The hydrocarbon composition in released gas increases with the treated temperature.The covalent bonds are broken above 240℃.The hydrocarbon composition in released gas increases from 2.13% at 240℃ to 8.59% at 300℃.The aliphatic carbon in lignite deceases from 44.83% in XF-240 to 39.49% in XF-300.The oxygen-linked carbon in lignite decreases from 12.57% in XF-240 to 1.49% in XF-300.Hydrothermal treatment plays a role in deoxygenation and upgrading of raw lignite.The oxygen contents decrease by about 30% and the aromatic carbon increases to 60.50% at 300℃.
- lignite,
- hydrothermal treatment,
- ¹³C-NMR,
- carbon structure,
- hydrogen transfer
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