Modification of Functional Groups and Stacking Structure of Some Indian Non-Coking Coals During Pyrolysis

Sharma, Raj Vardhan and Gupta, Pavan Kumar and Maity, Sudip (2025) Modification of Functional Groups and Stacking Structure of Some Indian Non-Coking Coals During Pyrolysis. Combustion Science and Technology. ISSN 0010-2202

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Abstract

Changes in stacking structure and the functional groups of three non-coking coals during pyrolysis have been carried out using X-ray diffraction (XRD) and Fourier-Transform Infrared Spectroscopy (FTIR). The interlayer spacing of the stacking structure changed from 3.44 to 3.66 Å, 3.49 to 3.68 Å, and 3.60 to 3.72 Å and aromaticity changed from 0.64 to 0.70, 0.63 to 0.74, and 0.68 to 0.78 due to pyrolysis of the samples AMD, BMD and JMD respectively. The rank parameters also change from 1.80 to 2.29, 1.72 to 2.36, and 1.61 to 3.49 for the same coals in similar order. It is observed that the interlayer spacing, aromaticity and rank of coal increase with the increase in temperature. The FTIR results show that the functional group associated with minerals increases while the functional groups associated with coal macerals like methyl group, C=C aromatic, and oxygen-containing functional groups decrease due to pyrolysis. The FTIR structural parameters such as the ratio of aliphatic to the total atomic hydrogen, and the ratio of carbonyl to aromatic groups decrease with the increase in temperature while aromaticity, degree of condensation of aromatic rings, and the ratio of aliphatic to aromatic carbon increase with the increase in temperature up to 600°C. The sudden changes in FTIR structural parameters of coals are observed at 800°C. The present study shows that with increasing temperature, the aromatization and degree of condensation of aromatic rings of coal increase with the removal of aliphatic side chains and reduction in oxygen-containing functional groups.

Item Type:	Article
Subjects:	Coal Gesification
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	30 Apr 2025 09:52
Last Modified:	30 Apr 2025 09:52
URI:	http://cimfr.csircentral.net/id/eprint/2791

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