Article: In-depth analysis of coal chemical structural properties response to flue gas saturation: perspective on long-term CO2 sequestration Journal: International Journal of Oil, Gas and Coal Technology (IJOGCT) 2024 Vol.36 No.5 pp.1 - 17 Abstract: A comprehensive study on the chemical structural properties of coals after flue gas exposure is significant to consider long-term carbon dioxide (CO2) sequestration in deep and unmineable coal reservoirs. Two South African coals were exposed to a five-component synthetic flue gas typical of a coal-fired power plant for 90 days at 9.0 MPa pressure and 60°C temperature. Advanced characterisation techniques were used, including carbon-13 solid-state nuclear magnetic resonance spectroscopy (13C ssNMR), universal attenuated total reflectance-Fourier transform infrared (UATR-FTIR), field emission gun scanning electron microscopy with energy dispersive X-ray spectroscopy (FEG SEM-EDX), and wide-angle X-ray diffraction (WXRD) to capture the chemical structural changes. The results show weakened functional groups of -OH, out-of-plane aromatic C-H, aliphatic C-O, C-C, and C-H. There is structural deformation in the crystalline diameter and inter-layer spacing that is sorption-induced owing to the flue gas saturation, and the coals oxygen functionalities revealed notable changes. [Received: October 22, 2023; Accepted: July 7, 2024] Inderscience Publishers - linking academia, business and industry through research

Title: In-depth analysis of coal chemical structural properties response to flue gas saturation: perspective on long-term CO₂ sequestration

Authors: Major Mabuza; Kasturie Premlall; Mandlenkosi G.R. Mahlobo

Addresses: Department of Chemical Engineering Technology, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2088, South Africa ' Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa ' Department of Chemical and Materials Engineering, University of South Africa, P.O. Box 392, Florida 1709, South Africa

Abstract: A comprehensive study on the chemical structural properties of coals after flue gas exposure is significant to consider long-term carbon dioxide (CO₂) sequestration in deep and unmineable coal reservoirs. Two South African coals were exposed to a five-component synthetic flue gas typical of a coal-fired power plant for 90 days at 9.0 MPa pressure and 60°C temperature. Advanced characterisation techniques were used, including carbon-13 solid-state nuclear magnetic resonance spectroscopy (¹³C ^ssNMR), universal attenuated total reflectance-Fourier transform infrared (UATR-FTIR), field emission gun scanning electron microscopy with energy dispersive X-ray spectroscopy (FEG SEM-EDX), and wide-angle X-ray diffraction (WXRD) to capture the chemical structural changes. The results show weakened functional groups of -OH, out-of-plane aromatic C-H, aliphatic C-O, C-C, and C-H. There is structural deformation in the crystalline diameter and inter-layer spacing that is sorption-induced owing to the flue gas saturation, and the coals oxygen functionalities revealed notable changes. [Received: October 22, 2023; Accepted: July 7, 2024]

Keywords: advanced characterisation; chemical structural properties; CO₂ sequestration; flue gas; unmineable coal seams.

DOI: 10.1504/IJOGCT.2024.141437

International Journal of Oil, Gas and Coal Technology, 2024 Vol.36 No.5, pp.1 - 17

Received: 03 Oct 2023
Accepted: 07 Jul 2024
Published online: 12 Sep 2024 *

Title: In-depth analysis of coal chemical structural properties response to flue gas saturation: perspective on long-term CO2 sequestration

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Title: In-depth analysis of coal chemical structural properties response to flue gas saturation: perspective on long-term CO₂ sequestration