Raman Characteristics of Kuznetsk Basin Coal and Coal-Based Sorbents

Nikitin, A. P.; Dudnikova, Yu. N.; Mikhaylova, E. S.; Ismagilov, Z. R.

doi:10.3103/s1068364x19090059

Cited by 9 publications

(2 citation statements)

References 9 publications

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“…Raman spectroscopy is a nondestructive and rapid detection technique, which can be used to reveal the disorder of the amorphous structure and the order of the crystallite structure inside the coal sample. The Raman effect originates from the vibration and rotation of molecules and lattices, so we can obtain the relevant parameters such as molecular vibration level, lattice vibration level, and rotation level from the Raman spectrum [30][31][32]. A Horiba Evolution Raman spectrometer is adopted in this study, and a laser with a wavelength of 532 nm is selected for testing.…”

Section: Methodsmentioning

confidence: 99%

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Study on the Destructive Effect of Small Faults on Coal Pore Structure

Liu

Song

et al. 2022

Geofluids

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Small fault area in coal mine has great risk of coal and gas outburst. However, the damage effect of small faults on coal pore structure still lacks systematic research. Taking a small reverse fault under Pingmei No. 2 mine as an example, this paper collects the hanging wall coal samples within 5 m from the fault plane and the coal samples 50 m from the fault plane, where there is no fault development. The pore structure characteristics of the two coal samples were analyzed and compared by means of a scanning electron microscope, mercury injection, liquid nitrogen adsorption, and Raman spectroscopy. The test results show that compared with the coal samples without faults, the coal samples at faults form micron-scale fracture zones with constant spacing, stable occurrence, and flat two walls. The pore volume and pore specific surface area of different pore sizes increase, the pore peak of mesopore (100~1000 nm) shifts from 1000 nm to 200~400 nm, and its connectivity is enhanced. The number of micropores (<10 nm) increased significantly, and the ink bottle type pores developed. Faulting also has a certain impact on the macromolecular structure of coal, which shows that the D peak area decreases and the area of G peak increases, indicating that the order degree of macromolecular structure of coal increases.

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Section: Methodsmentioning

confidence: 99%

“…The G-band is related to the stretching vibration of C=C and represents the degree of order in the molecular structure. The area of the G peak is positively correlated with the total amount of aromatic rings and the enrichment degree of aromatic carbon in the macromolecular structure of coal [31,37,38].…”

Section: Isotherm Adsorption-desorptionmentioning

confidence: 97%

Study on the Destructive Effect of Small Faults on Coal Pore Structure

Liu

Song

et al. 2022

Geofluids

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Enhancing cadmium removal efficiency through spinel ferrites modified biochar derived from agricultural waste straw

Bai

Chai

Yuan

et al. 2023

Journal of Environmental Chemical Engineering

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Ultraviolet Raman spectra: The reasonable method of evaluating coal pyrolysis graphitization

et al. 2020

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Raman spectrum is a common method of evaluating the graphitization degree of carbon materials. However, there is still some controversy over its evaluation for coal graphitization, i.e., whether large ID/IG means a high graphitization degree of coal. This work uses an ultraviolet (UV) Raman spectrum to find a better index of graphitization degree. The T peak (sp3 sites) of coal was first directly detected. The IT/IG and ID/IG decrease after pyrolysis in UV Raman spectra at 266 nm, which shows that the sp3 site relative content decreases and the sp2 site relative content increases. Moreover, the absolute value of the D band dispersion slopes as the excitation wavelength increases and the D peak width decreases, which shows that the coal gets more orderly after pyrolysis. The position difference (G–D) decreases and the G peak width increases after pyrolysis in UV–Vis Raman spectra, indicating the decomposition of vitrinite in coal. The 2D′ peak decreased after pyrolysis. These parameters in multi-wavelength Raman spectra can be used to evaluate the structure of coal.

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Raman Characteristics of Kuznetsk Basin Coal and Coal-Based Sorbents

Cited by 9 publications

References 9 publications

Study on the Destructive Effect of Small Faults on Coal Pore Structure

Study on the Destructive Effect of Small Faults on Coal Pore Structure

Enhancing cadmium removal efficiency through spinel ferrites modified biochar derived from agricultural waste straw

Ultraviolet Raman spectra: The reasonable method of evaluating coal pyrolysis graphitization

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