Citation: LI Xia, ZENG Fan-gui, WANG Wei, DONG Kui. XRD characterization of structural evolution in low-middle rank coals[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(7): 777-783. shu

XRD characterization of structural evolution in low-middle rank coals

Key Laboratory of Coal Science & Technology, Ministry of Education & Shanxi Province, Shanxi Key Laboratory of Coal and Coal Measure Gas Geolology, Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: ZENG Fan-gui, zengfangui@tyut.edu.cn
Received Date: 21 January 2016
Revised Date: 16 March 2016

Fund Project: the Joint Funds of the Coal Based and Low Carbon of Shanxi U1510102The project was supported by National Natural Science Foundation of China 41302127Shanxi Province Coal Based Key Scientific and Technological Projects MQ2014-01

Figures(4)

The structural parameters including L_a, L_c and d₀₀₂ of 28 coal samples with the maximum vitrinite reflectance R_{o, max} varying from 0.30% to 2.05% were analyzed using X-ray diffraction (XRD). The change in the XRD parameters associated with increasing vitrinite reflectance was obtained. The results indicate that, for the test coals with R_{o, max} less than 1.0%, the values of L_a and L_c sharply increase while d₀₀₂ shows a reverse trend, and the decrease of oxygen-containing functional group and the length of branching aliphatic side chains are dominated. For those with R_{o, max} from 1.0% to 1.6%, the value of L_a continuously increases, d₀₀₂ increases first and then decreases, and L_c decreases first and then remains steady. Moreover, dehydrogenation and adjusting the space steric hindrance are simultaneous. The value of d₀₀₂ continues to decrease while L_a and L_c increases, and the variation of coal structure is dominated by aromatization process during the R_{o, max} range of 1.6% to 2.0%. The variation of XRD parameters presents close relation with the first and the second coalification jump phase.
- low-middle rank coals,
- X-ray diffraction,
- structural evolution
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