Sorption of carbon dioxide–methane mixtures

Ceglarska-Stefańska, G.; Zarębska, Katarzyna

doi:10.1016/j.coal.2005.01.003

Cited by 57 publications

(20 citation statements)

References 38 publications

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“…According to literature [21][22][23], the CO2 affinity for the coal structure is twice as much as the methane, and methane is readily desorbed from the coal and replaced by carbon dioxide. The phenomenon of preferential carbon dioxide adsorption on natural coals is connected with a linear molecule shape, small size of the kinetic diameter of molecules (0.330 nm), large adsorption affinity (energy), high quadrupole moment and low value of the activation energy [24,25]. The percentage of gas adsorbed [% vol.…”

Section: Resultsmentioning

confidence: 99%

Sorption characteristic of coal as regards of gas mixtures emitted in the process of the self-heating of coal

Wojtacha‐Rychter

Smoliński

2017

E3S Web Conf.

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Abstract. One of the most challenging tasks in the coal mining sector is the detection of endogenous fire risks. Under field conditions, the distance between the points where samples for the analyses are collected and the actual place where coal self-heating takes place may be quite remote. Coal is a natural sorbent with a diverse character of pore structures which are surrounded by fractures and cleavage planes constituting ideal spaces for the flow and adsorption of gases. The gases (methane, ethane, ethylene, propane, propylene, acetylene, carbon dioxide, carbon monoxide, hydrogen) released from the source of fire migrate through the seam and may be subject to adsorption, or they may cause the desorption of gases accumulated in coal. Therefore, the values of reference sample concentrations may be overstated or understated, respectively. The objective of this experimental study was to investigate the adsorption phenomena accompanying the flow of a multi-component gas mixture through a coal bed which may occur in situ. The research was conducted by means of a method based on a series of calorimetric/chromatographic measurements taken to determine the amount of gases released during coal heating at various temperatures under laboratory conditions. Based on the results obtained in the course of the experiments, it was concluded that the amount of gas adsorbed in the seam depends on the type of coal and the gas. Within the multi-component gas mixture, hydrocarbons demonstrated the largest sorption capacity, especially as concerns propylene.

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Section: Resultsmentioning

confidence: 99%

Sorption characteristic of coal as regards of gas mixtures emitted in the process of the self-heating of coal

Wojtacha‐Rychter

Smoliński

2017

E3S Web Conf.

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“…In addition, an extensive set of high-pressure adsorption data of CO 2 , CH 4 and N 2 and their mixtures on three water-moistened coals, namely Fruitland, Tiffany and Illinois, was reported, and the data were described using a simplified local-density model (Fitzgerald et al 2005;Fitzgerald and Robinson 2006). The displacement of CH 4 adsorbed on coals by injecting either pure CO 2 , pure N 2 or CO 2 /N 2 mixtures was investigated on a dried Japanese coal sample (Shimada et al 2005), and CO 2 -CH 4 binary adsorption measurements on two types of Polish coal have also been reported (Ceglarska-Stefanska and Zarebska 2005). Finally, the adsorption of pure CO 2 and a flue gas (containing mainly nitrogen, carbon dioxide, hydrogen and methane) on a coal sample from the Silesian Basin in Poland in dry and wet state was recently investigated, showing that CO 2 was the most and CH 4 the second most preferred component adsorbed (Mazumder et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Competitive adsorption equilibria of CO2 and CH4 on a dry coal

et al. 2008

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Gases like CO 2 and CH 4 are able to adsorb on the coal surface, but also to dissolve into its structure causing the coal to swell. In this work, the binary adsorption of CO 2 and CH 4 on a dry coal (Sulcis Coal Province, Italy) and its swelling behavior are investigated. The competitive adsorption measurements are performed at 45°C and up to 190 bar for pure CO 2 , CH 4 and four mixtures of molar feed compositions of 20.0, 40.0, 60.0 and 80.0% CO 2 using a gravimetric-chromatographic technique. The results show that carbon dioxide adsorbs more favorably than methane leading to an enrichment of the fluid phase in CH 4 . Coal swelling is determined using a high-pressure view cell, by exposing a coal disc to CO 2 , CH 4 and He at 45 and 60°C and up to 140 bar. For CO 2 and CH 4 a maximum swelling of about 4 and 2% is found, whereas He shows negligible swelling. The presented adsorption and swelling data are then discussed in terms of fundamental, thermodynamic aspects of adsorption and properties which are crucial for an ECBM operation, i.e. the CO 2 storage capacity and the dynamics of the replacement of CH 4 by CO 2 .

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“…Many papers have been published in the ares of gases sorption such as carbon dioxide, methane, water, carbon monoxide, hydrocarbons (Chaback et al 1996;Krooss et al 2002;Prusty 2008;Prinz and Littke 2005). The most attention was focused on sorption of carbon dioxide and methane (Mastalerz et al 2004;Larsen 2004;Ceglarska-Stefańska and Zarębska 2005;Siemons and Busch 2007;Ottiger et al 2008).…”

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confidence: 99%

Examination of sorption and desorption of hydrogen on several samples of polish hard coals

Cygankiewicz

Dudzińska

Żyła³

2012

Adsorption

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Performed tests showed that at 298 K hard coals sorb relatively small amounts of hydrogen. Those amounts depend on carbon and oxygen content in tested coals. The most considerable amounts of hydrogen are sorbed by coals characterized by strong surface hydrophobicity and high content of aliphatic hydrocarbons. The hydrophilic nature of coal surface does not lead to higher sorption of hydrogen. It was found that the change in amount of sorbed hydrogen is closely related to the moisture. For high moisture coal a significant decrease in hydrogen sorption is observed. Also tests on hydrogen desorption on hard coals were carried out using method of lowering hydrogen pressure above the sorbent. Obtained results showed that tested coals desorb various amounts of hydrogen. Process of sorption is reversible only for some coals, while for the others the desorption isotherm partially lies beneath the sorption isotherm, which indicates that in addition to hydrogen some other chemical substances are emitted from coal.

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Sorption of carbon dioxide–methane mixtures

Cited by 57 publications

References 38 publications

Sorption characteristic of coal as regards of gas mixtures emitted in the process of the self-heating of coal

Sorption characteristic of coal as regards of gas mixtures emitted in the process of the self-heating of coal

Competitive adsorption equilibria of CO2 and CH4 on a dry coal

Examination of sorption and desorption of hydrogen on several samples of polish hard coals

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