Physical and structural effects of carbon dioxide storage on vitrinite-rich coal particles under subcritical and supercritical conditions

Mavhengere, P.; Maphala, Tshifhiwa; Wagner, Nicola J.

doi:10.1016/j.coal.2015.08.002

Cited by 22 publications

(17 citation statements)

References 31 publications

(50 reference statements)

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“…Previous studies reported that S mic of dry coals decreases after ScCO 2 exposure (Mavhengere et al., 2015; Zhang et al., 2016, 2017b), and ScCO 2 -induced matrix swelling was considered the primary reason for that. Studies on as-received coals also reported the same trend as that of the dry coals after ScCO 2 exposure (Kutchko et al., 2013; Mastalerz et al., 2008).…”

Section: Effects Of Scco2 On the Pore Morphology Of Coalsmentioning

confidence: 97%

“…Source: reproduced with permission from Kutchko et al., 2013; Mavhengere et al., 2015; Wang et al., 2015c; Zhang et al., 2016, 2017a.…”

Section: Effects Of Scco2 On the Pore Morphology Of Coalsmentioning

confidence: 99%

“…Results from both field-emission SEM and N 2 /CO 2 adsorption indicated that no significant changes were observed in the pore morphology of all the coal samples. Furthermore, Mavhengere et al (2015) studied the pore structure characteristics of a vitrinite-rich dry coal after exposure to ScCO 2 (12.5 MPa and 35 C) for six months and found that ScCO 2 significantly decreased the surface area and number of micropores of the coal sample. They attributed the decreasing pore structure parameters to vitrinite swelling induced by CO 2 .…”

Section: Roughness Of the Pore Structurementioning

confidence: 99%

“…Generally, the micropore volume has exhibited a decreasing trend after ScCO 2 exposure, when the intensity of the matrix swelling has been observed to be stronger than the other effects. Instead, the micropore volume has been found to increase Source: reproduced with permission from Kutchko et al, 2013;Mavhengere et al, 2015;Wang et al, 2015c;Zhang et al, 2016Zhang et al, , 2017a. (Chen et al, 2017;Zhang et al, 2017a).…”

Section: Microporesmentioning

confidence: 99%

“…In summary, the aforementioned characteristics of both ScCO 2 and coals have resulted in multiple interactions between the fluids and coals, i.e. ScCO 2 -induced coal matrix swelling (Sampath et al., 2019), the extraction of small organic compounds (André et al., 2007; Kolak and Burruss, 2006), and mineral dissolution or precipitation (Li et al., 2017; Mavhengere et al., 2015; Zhang et al., 2016). These interactions have been found to be capable of changing the pore structure of coals (Liu et al., 2019e; Massarotto et al., 2010; Zhang et al., 2017b), thereby, affecting CO 2 storage and CH 4 production within target coal seams.…”

Section: Introductionmentioning

confidence: 99%

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Influences of supercritical carbon dioxide fluid on pore morphology of various rank coals: A review

Zhang

Wang

et al. 2020

Energy Exploration & Exploitation

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Supercritical carbon dioxide is known to change the pore structure of coals and thus affect their carbon dioxide sequestration capacity. In this study, supercritical carbon dioxide dependence of pore morphology of coals was reviewed. Results indicated that the micropore surface area and volume of dry coals varied between –20% and 20% after exposure to supercritical carbon dioxide. Changes in the micropore size distribution of dry coals after supercritical carbon dioxide exposure were not found to be significant; however, the change in meso- and macropores with diameter of 2–8 nm was observed to be significant. Supercritical carbon dioxide and H2O exposure mainly influenced pores with diameters of 0.4–0.7, 0.7–0.9 and 2–8 nm. The variation in the pore fractal dimensions of the coals ranged from –0.5% to 0.5% after supercritical carbon dioxide exposure. Furthermore, the dependence of supercritical carbon dioxide on the pore structure of coals relies on the coal rank. The change in the pore structure of the coals after supercritical carbon dioxide exposure was observed to be related to the following aspects. First, supercritical carbon dioxide induced swelling in coal matrix, thus reducing the pore surface area and volume of the coal matrix and compressing the cleat system. Next, the extraction of supercritical carbon dioxide mobilised the small organic molecules dispersed in the coal matrix; this increased the pore volume, particularly of micropores. Finally, the mineral dissolution/precipitation also changed the pore structure of the coals. To further examine supercritical carbon dioxide dependence of coal pore morphology, the following studies should be performed. The characterisation of the chemical and pore structure of coals should be combined with existing coal structure models to account for the mechanism of supercritical carbon dioxide changing the pore structure of coals. Combination of physical experiments and numerical simulations is recommended to predict the changes in porosity and permeability of coals due to long-term carbon dioxide sequestration.

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Section: Effects Of Scco2 On the Pore Morphology Of Coalsmentioning

confidence: 97%

“…Source: reproduced with permission from Kutchko et al., 2013; Mavhengere et al., 2015; Wang et al., 2015c; Zhang et al., 2016, 2017a.…”

Section: Effects Of Scco2 On the Pore Morphology Of Coalsmentioning

confidence: 99%

Section: Roughness Of the Pore Structurementioning

confidence: 99%

Section: Microporesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influences of supercritical carbon dioxide fluid on pore morphology of various rank coals: A review

Zhang

Wang

et al. 2020

Energy Exploration & Exploitation

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Sorption and Desorption of CO2 and CH4 in Vitrinite- and Inertinite-Rich Polish Low-Rank Coal

et al. 2020

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Low-pressure sorption tests were carried out on samples of selected Polish bituminous coal in coal–methane and coal–carbon dioxide systems. The purpose was to determine the relationship between the petrographic composition of low-rank coal and the amount of gas stored in its porous structure and desorbed from it. The influence of the degree of coalification on the amount of sorbed gas was reduced to minimum, because isotherms of deposition and evacuation of gases were determined on the base coal samples and two concentrates of lithotypes, vitrain and durain, isolated from the original coal. It was found that the sorption capacity of carbon dioxide was related to the pertographic composition, but no such correlation was observed in regard to methane. Langmuir and Dubinin–Radushkevich sorption isotherms and the modified desorption model based on Langmuir equation were chosen. The applied equations gave a very good fit to the experimental data. Calculated parameters corresponding to free adsorption energy in the Dubinin–Radushkevich equation allow concluding on the independence of its mechanism from coal petrography and on the preference of carbon dioxide sorption. Calculated adsorption equilibrium constants in Langmuir’s equation show variability with petrographic composition of coal and have lower values for methane than for carbon dioxide. It was shown that the size of the hysteresis loop depends on the petrographic composition of coal and increases with increase in vitrinite content for both sorbates, which was confirmed by values of areal hysteresis index and hysteresis parameter.

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Effects of supercritical CO2 exposure on diffusion and adsorption kinetics of CH4, CO2 and water vapor in various rank coals

Liu

Long

et al. 2023

Arabian Journal of Chemistry

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Physical and structural effects of carbon dioxide storage on vitrinite-rich coal particles under subcritical and supercritical conditions

Cited by 22 publications

References 31 publications

Influences of supercritical carbon dioxide fluid on pore morphology of various rank coals: A review

Influences of supercritical carbon dioxide fluid on pore morphology of various rank coals: A review

Sorption and Desorption of CO2 and CH4 in Vitrinite- and Inertinite-Rich Polish Low-Rank Coal

Effects of supercritical CO2 exposure on diffusion and adsorption kinetics of CH4, CO2 and water vapor in various rank coals

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