Chun-mei YU, Nan ZHANG, Hai-peng TENG. Investigation of Different Structures of Coals Through FTIR and Raman Techniques[J]. Spectroscopy and Spectral Analysis, 2021, 41(7): 2050
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 7, 2050 (2021)
Fig. 1. The infrared spectra of the coal marked at the main peak position after baseline correction
(a): 2 000~400 cm-1; (b): 3 600~2 500 cm-1
(a): 2 000~400 cm-1; (b): 3 600~2 500 cm-1
Fig. 2. Relationship between H/C ratio and parameters obtained from FTIR calculation
(a): Apparent aromaticityf a(FTIR)vs H/C ratio; (b): (R/C )uvs H/C ratio; (c): H al/H and A ar/A alvs H/C ratio
(a): Apparent aromaticity
Fig. 3. Curve-fitted FTIR spectra of the aliphatic C—H stretching vibrational band in range of 3 000 to 2 800 cm-1
Fig. 4. Relationship between CH2/CH3 values and H/C atomic ratios
Fig. 5. Curve-fitted FTIR spectra of the aliphatic C—H stretching vibrational band in range of 900 to 730 cm-1
Fig. 6. Spectral decomposition results of coal samples with 10 bands method
Fig. 7. Relationship between H/C atomic ratios and parameters obtained from Raman spectra
(a): Area ratio of each peak and H/C atomic ratio; (b): Different peak area ratio and H/C atomic ratio; (c): Main peak FWHM and H/C atomic ratio
(a): Area ratio of each peak and H/C atomic ratio; (b): Different peak area ratio and H/C atomic ratio; (c): Main peak FWHM and H/C atomic ratio
Fig. 8. Simple coal structure model using Raman and infrared analysis
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Table 1. Proximate and ultimate analysis of different samples
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Table 2. Band assignments for different functional groups in FTIR spectra
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Table 3. Assignment of bands for Raman spectra (1 800~800 cm-1) of coals
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Table 4. Structure parameters from FTIR calculation
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