Citation: LIANG Hu-zhen, WANG Chuan-ge, ZENG Fan-gui, LI Mei-fen, XIANG Jian-hua. Effect of demineralization on lignite structure from Yinmin coalfield by FT-IR investigation[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(2): 129-137. shu

Effect of demineralization on lignite structure from Yinmin coalfield by FT-IR investigation

1.
Key Laboratory of Coal Science & Technology, Ministry of Education & Shanxi Province, Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: LIANG Hu-zhen, ZENG Fan-gui,
Received Date: 13 June 2013
Available Online: 6 November 2013
Fund Project: 国家自然科学基金(41302127,41372165,41072116,41102092)。 (41302127,41372165,41072116,41102092)

The raw coal and demineralized coal obtained from Yimin lignite were studied by Fourier transform infrared spectroscopy (FT-IR) with curve-fitting analysis to obtain the structure change information after demineralization. The results show that demineralization has little effect on aliphatic hydrogen and hydroxyl. The absorption intensity of CH₂ asymmetric stretching vibration changed little, that of CH stretching vibration decreases, and that of CH₂ symmetric stretching vibration and CH₃ asymmetric stretching vibration increases. The absorption intensity of OH-N, OH-OH and OH-π hydrogen bonds decreases and that of ring hydroxyl and OH-O intensity increases. Demineralization has great effect on aromatic structures and oxygen-containing groups. Aromatic structures change from three hydrogens per ring dominating to three and four hydrogens per ring dominates. The absorption intensity of alkyl ether and aliphatic carboxylic acids decreases significantly after demineralization, which may be caused by hydrolysis reaction. The absorption intensity of phenolic hydroxyl and carboxylic acids increases greatly after demineralization.
- raw coal,
- demineralized coal,
- FT-IR,
- coal structure
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