Sorption of carbon dioxide on the lithotypes of low rank coal

Czerw, Katarzyna; Dudzińska, Agnieszka; Baran, Paweł; Zarębska, Katarzyna

doi:10.1007/s10450-019-00122-5

Cited by 7 publications

(2 citation statements)

References 23 publications

(36 reference statements)

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“…Samples were degassed before measurement. The SO 2 , CO 2 and NH 3 measurements were carried out at a temperature of 25 • C, while the water sorption was carried out at 30 • C. The samples were degassed (up to a pressure of 10 −5 bar) and rinsed with helium (for 24 h) before measurement [13,28,29].…”

Section: Sorption Experimentsmentioning

confidence: 99%

Sorption of Polar Sorbates NH3, H2O, SO2 and CO2 on Selected Inorganic Materials

et al. 2023

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In this paper, the sorption of NH3, H2O, SO2 and CO2 was tested for several selected inorganic materials. The tests were performed on samples belonging to two topologies of materials, faujasite (FAU) and framework-type MFI, the structures of which differ in pore size and connectivity. All sorbates are important in terms of reducing their emissions to the environment. They have different chemical nature: basic, alkaline, and acidic. They are all polar in structure and composition and two of them (ammonia and water vapor) can form hydrogen bonds. These differences result in different interactions with the surface of the adsorbents. This paper presents experimental data and proposes a mathematical description of the sorption process. The best fit of the experimental data was obtained for the Toth and GAB models. The studies showed that among the selected samples, faujasite has the best sorption capacity for ammonia and water vapor, while the best sorbent for sulfur dioxide is the MFI framework type. These materials behave like molecular sieves and can be used for quite selective adsorption of relevant gases. In addition, modification of the faujasite with organic silane resulted in a drastic reduction in the surface area of the sorbent, resulting in significantly lower sorption capacities for gases.

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Section: Sorption Experimentsmentioning

confidence: 99%

Sorption of Polar Sorbates NH3, H2O, SO2 and CO2 on Selected Inorganic Materials

et al. 2023

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“…There is a consistent understanding of the influence of external factors on the adsorption of coal, but there is still a dispute on the influence of coal maceral groups. Most scholars found that the gas adsorption capacity of vitrinite was stronger than that of inertinite, − while a few scholars found that the gas adsorption capacity of inertinite was stronger than that of vitrinite, − and some other scholars found that there was no obvious relationship between vitrinite and inertinite and gas adsorption capacity. − …”

Section: Introductionmentioning

confidence: 99%

Pore Structure and Adsorption Characteristics of Maceral Groups: Insights from Centrifugal Flotation Experiment of Coals

et al. 2023

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Coal has various types of macerals, which have different pore structures and adsorption properties that change with coal’s thermal metamorphism. In-depth study of the characteristics of different coal macerals, especially the pore structure and adsorption properties, can better predict the coal reservoir gas storage capacity and migration ability. In this study, the sub-samples enriched in a specific maceral group with different coal ranks and particle sizes were obtained by centrifugal flotation experiments. Then, experiments containing low-temperature N2 isotherm adsorption (LT-N2GA), low-temperature CO2 isotherm adsorption (LT-CO2GA), and methane isothermal adsorption were carried out on the sub-samples to quantitatively analyze the evolution characteristics of pore structure and adsorption properties of different maceral groups. The results showed the following: (1) The separation effect of the light maceral groups by centrifugal flotation experiments increased with the decrease of particle sizes, which were treated with the heavy liquid of low and medium densities, while that of the heavy maceral groups had the relatively best separation effect in the particle sizes of 0.1–0.125 mm, which were treated with the heavy liquid of high densities. (2) The vitrinite-enriched samples had more ultra-micropores (mainly within the diameter range of 0.4–0.65 nm), while the inertinite enriched samples had more mesopores and transition pores (mainly within the diameter range of 40–50 nm). (3) For the low-rank coal, inertinite had more potential methane adsorption capacity. However, for the medium- and high-rank coal, vitrinite had more potential methane adsorption capacity. (4) For the low-rank coal, the adsorption potential and adsorption space increased with the increase of the inertinite content, while the adsorption potential, adsorption space, and surface free energy for the medium- and high-rank coal increased with the increase of vitrinite content. It is expected that the results can deepen the understanding about the gas storage capacity and migration ability and be used in the prevention of gas outburst and the reduction of carbon emission.

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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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Sorption of carbon dioxide on the lithotypes of low rank coal

Cited by 7 publications

References 23 publications

Sorption of Polar Sorbates NH3, H2O, SO2 and CO2 on Selected Inorganic Materials

Sorption of Polar Sorbates NH3, H2O, SO2 and CO2 on Selected Inorganic Materials

Pore Structure and Adsorption Characteristics of Maceral Groups: Insights from Centrifugal Flotation Experiment of Coals

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

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