Relationship between coking coal quality and its micro-Raman spectral characteristics

Morga, R.; Jelonek, Iwona; Kruszewska, Krystyna

doi:10.1016/j.coal.2014.09.013

Cited by 47 publications

(29 citation statements)

References 40 publications

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“…Frequently, especially in bituminous coals and cokes, only one band in the 1200-1240 cm −1 region, named D4, is indicated. [43,[46][47][48][49]. A very weak D7 band at ~1095 cm −1 , marked SR by Li et al [6], is found in most of the spectra.…”

Section: Random Reflectance and Proximate And Ultimate Parameters Of ...mentioning

confidence: 60%

Micro-Raman Spectroscopy of Selected Macerals of the Huminite Group: An Example from the Szczerców Lignite Deposit (Central Poland)

Bielowicz

Morga

2021

Energies

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Lignite (ulminite reflectance Rr = 0.27%) from the Szczerców deposit (Central Poland) is dominated by huminite group macerals, containing a high proportion of attrinite and densinite. Densinite and ulminite are more abundant in small aromatic units than attrinite, which may result from their stronger gelification. The differences in Raman spectral characteristics between attrinite and ulminite are more pronounced than between attrinite and densinite. Fusinite, in comparison with the huminite group macerals, is composed of larger, more varied aromatic systems. The D4 (1190–1200 cm−1) and D5 bands (1280–1290 cm−1), most likely, correspond to different chemical structures, and their origin should be further investigated.

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Section: Random Reflectance and Proximate And Ultimate Parameters Of ...mentioning

confidence: 60%

Micro-Raman Spectroscopy of Selected Macerals of the Huminite Group: An Example from the Szczerców Lignite Deposit (Central Poland)

Bielowicz

Morga

2021

Energies

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“…R r of coal is an important indicator for identifying the degree of coalification. [121] A large number of researchers [4,[122][123][124][125][126] aim to explore new methods for a rapid assessment of coal rank by Raman spectroscopy, studying the relationship between R r and the Raman spectral parameters of coal. Hinrichs et al [4] studied Raman spectra and R r of 35 coals with R r in the range from 0.18% to 4.67% and found that with the increase of R r , the FWHM-G and the full width at half maximum of D band (FWHM-D) decrease and the peak position (W D ) of the D band shifts to lower wavenumbers.…”

Section: Study Of Coal Rankmentioning

confidence: 99%

“…An empirical formula of the correlation between Raman parameters and R r was obtained. Morga et al [122] tested Raman spectra of 20 samples of coal char (0.84% < R r < 1.43%) and found that FWHM-G and A G /A all (the ratio of G band area to total Raman area) decreased with increasing R r . Wu et al [96] found that A D1 /A G , A D2 /A G , A D3 /A G , and A D4 /A G showed a sharp decrease with the increase of coal rank.…”

Section: Study Of Coal Rankmentioning

confidence: 99%

Progress of Raman spectroscopic investigations on the structure and properties of coal

Xia

Wang

et al. 2020

J Raman Spectroscopy

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Raman spectroscopy is a nondestructive and in situ analytical technique that could provide information on the chemical structure and structural ordering of carbonaceous materials. Based on the E2g symmetric stretching vibration mode in the aromatic layers (G band, ~1,580 cm−1) and the defect structure in graphite (D band, ~1,350 cm−1), Raman spectroscopy has been used extensively to characterize the structural features of carbonaceous matters since 1970. Coal is a complex organic compound made up mainly by carbon showing characteristic Raman bands. This article reviews the application of Raman spectroscopy for coal structure characterization under room temperature, to determine its chemical structure, crystallite size, coal rank, and combustion reactivity. Future research for collecting Raman spectra during coal pyrolysis at high temperatures is also discussed. The combination of high‐temperature hot stage with Raman spectroscopy technology allows direct collection of Raman spectra at high temperature.

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“…According to the method developed by Sadezky et al [11][12][13][14][15][16], five bands were selected in this work, namely G~1580 cm −1 , D 1~1 350 cm −1 , D 2~1 620 cm −1 , D 3 1500 cm −1 , D 4~1 200 cm −1 . However, it was found that when using five Gaussian bands during curve-fitting research with the PeakFit software, the goodness-of-fit R 2 were better than that in literatures using 4 Lorentzian (G, D 1 , D 2 , D 4 ) bands and 1 Gaussian band (D 3 ).…”

Section: Effect Of Preheating Temperature On Coal Structurementioning

confidence: 99%

Study on the Influence of Different Preheating Conditions on Carbon Structure of 1/3 Coking Coal

Zhang

Wang

Xue

et al. 2020

The Minerals, Metals &Amp; Materials Series

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The 1/3 coking coal, a kind of typical coking coal in the cokemaking process, was used as raw materials in this study. Coal materials were preheated to 200°C, 300°C, 350°C, 380°C, 400°C, and 420°C, respectively, by two ways, one way was putting them at room temperature in a heating furnace and let their temperature rise with the heating of furnace (slow preheating), another way was heating coal with hot gas heated to a certain temperature (quick preheating). The heating rate of coal was about 2-4°C/min in the former way and ranged from 14.40 to 28.44°C/min in a second way. The Raman spectra of coal chars over the range of 800-1800 cm −1 were curve-fitted with 1 structural ordered band (G) and 4 defect bands (D 1 , D 2 , D 3 , D 4 ). In temperature range of 200-350°C, the degree of organization of coal chars raised with increasing temperature and the quick preheating made the carbon structure of coal more disordered than those of raw coal and slow preheated coal chars. When preheated to 380-420°C, the plastic mass emerged in coal bed and the degree of organization of samples under all preheating conditions increased overall.

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Relationship between coking coal quality and its micro-Raman spectral characteristics

Cited by 47 publications

References 40 publications

Micro-Raman Spectroscopy of Selected Macerals of the Huminite Group: An Example from the Szczerców Lignite Deposit (Central Poland)

Micro-Raman Spectroscopy of Selected Macerals of the Huminite Group: An Example from the Szczerców Lignite Deposit (Central Poland)

Progress of Raman spectroscopic investigations on the structure and properties of coal

Study on the Influence of Different Preheating Conditions on Carbon Structure of 1/3 Coking Coal

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