Volume 48 Issue 1
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HAO Guoqiang, HU Sherong. Organic nitrogen forms of different rank coals in Handan-Fengfeng mining area, China[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(1): 70-76. DOI: 10.3969/j.issn.1001-1986.2020.01.010
Citation: HAO Guoqiang, HU Sherong. Organic nitrogen forms of different rank coals in Handan-Fengfeng mining area, China[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(1): 70-76. DOI: 10.3969/j.issn.1001-1986.2020.01.010
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Organic nitrogen forms of different rank coals in Handan-Fengfeng mining area, China

  • 1. School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan 056038, China;

  • 2. Hebei Colleges R & D Center of Coal Resources, Handan 056038, China;

  • 3. School of Geoscience and Survey Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China

Funds: 

National Natural Science Foundation of China (41072119)

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  • Received Date: June 27, 2019
  • Revised Date: November 21, 2019
  • Published Date: February 24, 2020
    Graphical Abstract
    • Abstract
  • Nitrogen is one of the common elements in coal. The occurrence forms of nitrogen in coal are various and vary with coal rank. Based on X-ray photoelectron spectroscopy (XPS), taking Handan-Fengfeng mining area as an example, organic nitrogen forms of different rank coals(Rran=1.08%-3.67%) were studied, and the variation of the relative abundance of each organic nitrogen with rank was further discussed. The results show that four kinds of nitrogen forms are considered for the coals according to binding energies of N 1s XPS sub-peaks, corresponding to N-6, N-5, N-Q and N-X. N-5 is the most abundant organic nitrogen and its relative abundance decreases as coal rank increases, while N-Q shows opposite trend. The variation of the relative abundance of N-6 with rank shows “increasing-decreasing-stable” trend, and N-X accounts for 9.1%-35.1% of the total organic nitrogen, whose changing with coal rank is not obvious. Protonated pyridinic nitrogen, a type of N-Q, which dominates in lignite, almost disappears at a coal rank range from Rran 1.08% to Rran 1.47% due to the loss of oxygen groups and deprotonation, resulting in the absence of N-Q sub-peaks in the XPS spectra.
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    • References (21)
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