Effect of Coal Grain Size on Sorption Capacity with Respect to Propylene and Acetylene

Dudzińska, Agnieszka; Howaniec, Natalia; Smoliński, Adam

doi:10.3390/en10111919

Cited by 14 publications

(12 citation statements)

References 17 publications

(23 reference statements)

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“…Coal is an extremely heterogeneous porous material containing both organic macerals and inorganic mineral matter [1]. The macromolecule structure of coal macerals offers plenty of adsorption sites for gaseous and liquid adsorbates [2][3][4]. In addition, the amorphous surface of coal enriches functional groups, possessing strong adsorption capacity for polar molecule adsorbates [5][6][7], such as water vapor.…”

Section: Introductionmentioning

confidence: 99%

Surface Properties and Pore Structure of Anthracite, Bituminous Coal and Lignite

et al. 2018

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Properties of coal surface and pore structure are important aspects to be investigated in coal preparation and utilization. In order to investigate the limits of different probe methods, a comprehensive approach was comparatively used to probe surface properties and pore structure of anthracite, bituminous coal and lignite. Surface morphology of the three coal samples was analyzed by scanning electron microscopy (SEM). Combining mercury intrusion porosimetry (MIP), physisorption method with carbon dioxide (CO 2) at 273 K and nitrogen (N 2) at 77 K was used to quantify a broad pore size distribution of coals, while FT-IR and water vapor sorption methods were used to study the coal surface properties. The results show that wedge-shaped pores develop with the increase of coal rank due to compression effect. The determined specific surface area (SSA) and pore volume of N 2 decrease with the increase of coal rank, while CO 2 SSA and pore volume are of a kind of U-shaped function of coal rank. MIP results indicate that that the pore size of 10-100 nm accounted for 70.7-97.5% of the total volume in the macropore range. Comparison of different methods indicates that micropores cannot be fully covered by the standard probes. CO 2 adsorption technique can only probe micropores in the range of 0.5 nm to 0.9 nm. Water vapor is not an effective probe to detect the micropores in coals, due to that the water clusters is mainly filled in mesopores and macropores. The results also show that both water vapor adsorption and FT-IR analysis can provide qualitative information of coal surface, rather than qualification of functional groups.

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Section: Introductionmentioning

confidence: 99%

Surface Properties and Pore Structure of Anthracite, Bituminous Coal and Lignite

et al. 2018

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“…Moisture content was determined in accordance with the PN-80/G-04511 standard and ash content in accordance with the PN-80/G-04512 standard. Hard coal can be very heterogenous with respect to chemical and petrographic composition, even over short distances (<1 km) [23,24]. The use of a relatively large, solid sample, with a mass of approximately 20 g, allows for better representation of the coal bed being studied, compared to literature data, where, very often, small samples, often not exceeding 1 g, are used.…”

Section: Research Materialsmentioning

confidence: 99%

The Influence of Temperature on the Expansion of a Hard Coal-Gas System

et al. 2018

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This paper presents experimental results of the sorption-dilatometric kinetics of methane and carbon dioxide on a sample of hard coal from one of the coal mines in the Upper Silesian Coal Basin. The experiment included isothermal and non-isothermal-isobaric stages. For the isothermal stage, it was found that, up to a certain point (about 8 dm3/kg), the sample’s expansion was linearly related to the amount of gas absorbed. Studies on dilatometric kinetics under constant pressure, with a reduction in temperature, indicate that a dominant share of the heat-expanding properties of carbonaceous material influences changes in the size of the sample in the coal-gas system. It was also found that the sample expansion, due to temperature change, was 2.25‰, for the sample in both the vacuum and the non-adsorbing gas atmosphere.

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“…The influence of coal particle size on the sorption capacity as regards mine gases has been previously studied. Yet most of these measurements were performed with the use of carbon dioxide and methane in respect to enhanced coalbed methane recovery or with the use of single gases, eg, propylene and acetylene as an adsorbate . In turn, studies on the sorption of the mixture of ethylene, propylene, propane, and ethane have been previously performed but only on coals with the grain size of 0.5 to 0.7 mm.…”

Section: Introductionmentioning

confidence: 99%

“…Yet most of these measurements were performed with the use of carbon dioxide and methane in respect to enhanced coalbed methane recovery 21,22 or with the use of single gases, eg, propylene and acetylene as an adsorbate. 23 In turn, studies on the sorption of the mixture of ethylene, propylene, propane, and ethane have been previously performed but only on coals with the grain size 8,13,24 of 0.5 to 0.7 mm. In the course of the experimental works, it was observed that propylene was the gas that sorbed in the larger amount and gained the sorption equilibrium in the longest time in comparison with ethane, ethylene, and propane.…”

Section: Introductionmentioning

confidence: 99%

The effect of coal grain size on the sorption of hydrocarbons from gas mixtures

2019

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Summary The flow of gas mixtures through coal, accompanied by sorption, is one of the natural processes occurring in the spontaneous heating of coal in underground mines. So far, studies on the sorption of mine gases have been mostly performed with regard to single components. In turn, sorption measurements with the use of gaseous mixtures were performed only on coals with grain size at the narrow range of 0.5 to 0.7 mm. In this paper, a dynamic sorption of a mixture of propylene, ethylene, propane, and ethane in a fixed‐bed column was investigated. Coal samples of various grain classes, ie, 0.25 to 0.50, 0.7 to 1.00, and 1.00 to 2.00 mm, were used as an adsorbent. The sorption tests were conducted at a constant gas flow rate of 2.17·10−7 m3/s and the pressure of approximately 1 atm. Next, the results of the sorption tests were compared with parameters characterizing the porous structure of the materials used. The total amount of sorbed gases decreases as the grain size becomes larger. The samples characterized by a lower carbon content (<70% w/w), a slightly higher oxygen content, and a larger surface area dominated by micropores at the range of 0.6 to 2.0 nm and mesopores with diameter of 2.0 to 10.0 nm had a higher sorption capacity than samples with the structure determined mainly by mesopores. It has been noticed that a high sorption ability of ethane results from its highest concentration in the mixture at the inlet of the sorption column. In most cases, propylene was sorbed in larger amount than ethylene, independently of grain size of coal and pore size distribution.

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Effect of Coal Grain Size on Sorption Capacity with Respect to Propylene and Acetylene

Cited by 14 publications

References 17 publications

Surface Properties and Pore Structure of Anthracite, Bituminous Coal and Lignite

Surface Properties and Pore Structure of Anthracite, Bituminous Coal and Lignite

The Influence of Temperature on the Expansion of a Hard Coal-Gas System

The effect of coal grain size on the sorption of hydrocarbons from gas mixtures

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