Citation: LIU Fang-jing, BIE Lei-lei, GUO Jia-pei, ZONG Zhi-min, WEI Xian-yong. Occurrence forms and molecular structural characteristics of the organic nitrogen in lignite[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(7): 776-784. shu

Occurrence forms and molecular structural characteristics of the organic nitrogen in lignite

Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining&Technology, Xuzhou 221116, China

Corresponding author: LIU Fang-jing, fangjingliu@cumt.edu.cn
Received Date: 17 June 2020
Revised Date: 4 July 2020

Fund Project: The project was supported by the National Natural Science Foundation of China (21808237), Basic Research Program of Jiangsu Province (BK20180642) and China Postdoctoral Science Foundation (2019T120478)Basic Research Program of Jiangsu Province BK20180642China Postdoctoral Science Foundation 2019T120478the National Natural Science Foundation of China 21808237

Figures(5)

The occurrence forms of organic nitrogen in Xianfeng lignite (XL), Xiaolongtan lignite (XLT) and Shengli lignite (SL) as well as their extraction residues were characterized by X-ray photoelectron spectroscopy (XPS). The results show that the content distributions of organic nitrogen in the three extraction residues are different, but all are mainly dominated by pyrrole nitrogen. The NaOH-catalyzed supercritical methanolysis of lignite extraction residues at 300℃ was then investigated, which indicates that the yields of petroleum ether soluble portions from supercritical methanolysis of extraction residues derived from XL, XLT and SL are 46.0%, 43.8%, and 47.6% (mass ratio), respectively. The characterization of nitrogen-containing compounds (NCCs) in petroleum ether soluble portions by Fourier transform ion cyclotron resonance mass spectrometry (FTICR/MS) indicates that NCCs are mainly composed of N₁, N₁O₁-N₁O₅, N₂, N₂O₁-N₂O₄, N₃O₂ and N₅O₂-N₅O₄ class species. The molecular structural characteristics of NCCs were speculated according to the distributions of double bond equivalent values and carbon numbers, which shows that most of NCCs contain oxygen-functional groups like hydroxyl and carboxyl groups, and the nitrogen atoms are mainly present in aromatic structures (mainly 1-3 aromatic rings) in the forms of pyrrolic, pyridinic and amino groups. The cleavage of C-O bridged bonds in lignite is an important pathway for producing NCCs.
- lignite,
- organic nitrogen,
- supercritical methanolysis,
- FTICR/MS
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