Physicochemical characterization of South African coals upon short-term flue gas exposure using conventional and advanced techniques

Mabuza, Major; Premlall, Kasturie; Daramola, Michael O.

doi:10.1016/j.mset.2019.09.008

Cited by 5 publications

(2 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Coal EML is inertinite-rich (74.2 vol.%, inc. mm), while Coal SML is vitriniterich (84.0 vol.%, inc. mm). Details of the petrography of the two coals may be acquired from Mabuza et al (2020).…”

Section: Methodology 21 Experimental Adsorption Datamentioning

confidence: 99%

Modelling of pure CO2 and flue gas sorption data on South African coals using Langmuir, Freundlich, Temkin, and Extended Langmuir isotherm models

Mabuza

Premlall

Daramola

2021

Preprint

Self Cite

View full text Add to dashboard Cite

Greenhouse gases (GHGs) have sharply increased over the past four decades due to intensifying industrial activities; as a result, the earth has been faced with global warming in which the major contributor is the anthropogenic carbon dioxide (CO 2 ) emissions. Carbon sequestration in unmineable coal seams has been proposed as one of the most attractive technologies to mitigate CO 2 emissions in which CO 2 is stored in the microporous structure of the coal matrix in an adsorbed state. The CO 2 adsorption process is hence considered one of the more effective methodologies in environmental sciences. Thus, adsorption isotherm measurements and modelling are key important scientific measures required in understanding the adsorption system, mechanism, and process optimization in coalbeds. In this paper, three renowned adsorption isotherm models were employed including Langmuir, Freundlich, and Temkin for pure CO 2 adsorption data, and the Extended-Langmuir model for multicomponent, such as flue gas mixture-adsorption data as investigated in this research work. The adsorption data was acquired from a high-pressure volumetric sorption system (HPVSS) experiment involving two South African coal samples from Ermelo and Somkhele coalfields with pure CO 2 and synthetic industrial flue gas to simulate emissions that are representative of a typical coal-fired power plant (12% CO 2 , 5.5% O 2 , 82% N 2 , 0.38% SO 2 , and 0.12% NO 2 ). The adsorption data was measured on 10 g samples with a mean size of 2 mm at temperatures ranging from 30 ºC to 60 ºC and pressure up to 9.0 MPa using the HPVSS. The statistical evaluation of the goodness-of-fit was done using three (3) statistical data analysis methods including correlation coefficient (R 2 ), standard deviation ( σ ), and standard error (SE). The Langmuir isotherm model conventionally fits the pure CO 2 gas experimental data better than Freundlich and Temkin. The Extended Langmuir gives best experimental data fit for the flue gas.

show abstract

Section: Methodology 21 Experimental Adsorption Datamentioning

confidence: 99%

Modelling of pure CO2 and flue gas sorption data on South African coals using Langmuir, Freundlich, Temkin, and Extended Langmuir isotherm models

Mabuza

Premlall

Daramola

2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The understanding of flue gas-coal interaction during direct flue gas sequestration in unmineable coal seams requires advanced analytical techniques to probe the chemical structural properties. These properties include surface chemistry, morphology, and crystallinity of the coal (Mabuza et al 2020). This paper presents insight into the behaviour of the coal specifically evaluating the chemical structural property changes upon long-term (2 232 hours) exposure to a synthetic industrial flue gas from a typical coal-fired power plant.…”

Section: Introductionmentioning

confidence: 99%

Effects of long-term flue gas exposure on chemical-structural properties of South African coals: perspective on advanced analytical techniques

Mabuza

Premlall

Daramola

2021

Preprint

Self Cite

View full text Add to dashboard Cite

The sequestration of carbon dioxide (CO 2 ) in unmineable coal seams is one of the geologic options earmarked to alleviate the emissions of the greenhouse gases to the atmosphere. Direct flue gas injection into unmineable coal seams has been considered to partially offset the cost of the utilizing this technology. This paper presents findings of the evolution of chemical structural properties of two South African coals from Somkhele (Coal SML) and Ermelo (Coal EML) coalfields after long-term (2 232 hours) flue gas exposure by applying advanced analytical techniques. The two coal samples were exposed to a synthetic flue gas simulating coal-fired power plant gas emissions containing 12% CO 2 , 5.5% O 2 , 82% N 2 , 0.38% SO 2 , and 0.12% NO 2 under in-seam temperature and pressure conditions of 60 °C and 9.0 MPa, respectively. The advanced analytical techniques applied included universal attenuated total reflectance-Fourier transform infrared (UATRFTIR), carbon-13 solid state nuclear magnetic resonance spectroscopy ( 13 C ss NMR), and field emission scanning electron microscopy with energy dispersive X-ray spectroscopy (FESEM-EDX) wide-angle X-ray diffraction (WAXRD). The UATR-FTIR spectra revealed weakened C─H, aliphatic C─C, C─O, ─OH, and out-of-plane aromatic C─H functional groups. The results from the treated coals of 13 C ss NMR for the structural parameters show notable changes in the oxygen functionalities reporting the aliphatic carbon bonded to oxygen, 𝑓 𝑎𝑙 𝑂 , while the WAXRD data showed some significant changes in the inter-layer spacing and the crystalline diameter as compared to the untreated coals.

show abstract

Enhanced Gas Recovery (EGR) in Shale Gas Reservoirs

Kudapa,

Dora,

Swaninathan

2024

Advances in Oil and Gas Exploration &Amp; Production

View full text Add to dashboard Cite

Physicochemical characterization of South African coals upon short-term flue gas exposure using conventional and advanced techniques

Cited by 5 publications

References 70 publications

Modelling of pure CO2 and flue gas sorption data on South African coals using Langmuir, Freundlich, Temkin, and Extended Langmuir isotherm models

Modelling of pure CO2 and flue gas sorption data on South African coals using Langmuir, Freundlich, Temkin, and Extended Langmuir isotherm models

Effects of long-term flue gas exposure on chemical-structural properties of South African coals: perspective on advanced analytical techniques

Enhanced Gas Recovery (EGR) in Shale Gas Reservoirs

Contact Info

Product

Resources

About