Thermodynamics of methane adsorption on carbon adsorbent prepared from mineral coal

Меньщиков, И. Е.; Школин, А. В.; Фомкин, А. А.; Khozina, E. V.

doi:10.1007/s10450-021-00338-4

Cited by 11 publications

(7 citation statements)

References 61 publications

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“…With the decrease of the high-energy adsorption site, the low-energy adsorption site will be occupied by methane molecules, releasing the lower adsorption heat. Therefore, the magnitude of methane adsorption heat mainly depends on high-energy adsorption site density with the adsorbent and the number of surface heteroatoms. , Isosteric adsorption heat of shale samples is a discrepancy, which is mainly caused by shales with higher organic matter content, which could have more adsorption sites and require more energy to convert free molecules to the adsorbed state.…”

Section: Resultsmentioning

confidence: 99%

Kinetic and Thermodynamic Characteristics of Supercritical Methane Adsorption on Organic-Rich Shale: A Case Study of Ordovician Wufeng and Silurian Longmaxi Gas Shale

Wang,

Yang,

Chen

et al. 2023

Energy Fuels

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Section: Resultsmentioning

confidence: 99%

Kinetic and Thermodynamic Characteristics of Supercritical Methane Adsorption on Organic-Rich Shale: A Case Study of Ordovician Wufeng and Silurian Longmaxi Gas Shale

Wang,

Yang,

Chen

et al. 2023

Energy Fuels

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“…Since the corrections for adsorption- and temperature-stimulated deformations are minimal for carbon materials with rigid structure, − Bakaev’s eq can be shortened as follows q normals normalt = prefix− R · Z · true[ ∂ ( normall normaln P ) ∂ ( 1 / T ) true] a − true( ∂ P ∂ a true) T · V a We used eq and the experimental methane and ethane adsorption data for ACs to evaluate the differential molar isosteric heats of adsorption as a function of methane and ethane uptake at 303 and 333 K (see Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…When considering the operational reliability of carbon adsorbents, it is necessary to mention our previous in situ dilatometric experiments, which revealed the reversible and isotropic deformation of ACs prepared from various raw materials (peat, silicon carbide, mineral coal, polymers) during the methane and carbon dioxide adsorption. − Note that the maximum magnitude of the methane adsorption-induced strain (AIS) of the peat-derived carbon adsorbent did not exceed 0.4–0.45% at 10 MPa and 213 K . The AUK-type carbon adsorbent changed its dimensions during methane adsorption, and the maximum AIS magnitude achieved 0.17% at 6 MPa and 273 K. , Both the reversible character of adsorption-induced deformation observed in ACs and its relatively small magnitude suggest that carbon adsorbents might demonstrate sufficient resistance to high-pressure adsorption processes and high-cycle fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nanoporous Carbon Structures on High-Pressure Adsorption Separation of Light Hydrocarbons

et al. 2023

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Four activated carbons (ACs) prepared from polymers (PMB, P-300), wood waste (S-1), and silicon carbide (AUK) by chemical and physical activation were investigated as potential adsorbents for ethane/methane mixture separation. Their textural properties were compared by performing scanning electron microscopy, X-ray, and CHNS/O elemental analysis. N 2 and CO 2 adsorption interpreted in terms of the theory of volume filling of micropores, non-local density functional theory (NLDFT), and Brunauer−Emmett−Teller (BET) models revealed very different porosity features of these ACs. The adsorption of pure ethane and methane onto all of the ACs was measured at pressures up to 50 bar and temperatures of 303−333 K in order to evaluate their adsorption selectivity for a methane/ethane mixture using the IAST method. The calculations indicated that ACs with the largest mean pore sizes, P-300 and PBM, are least suitable for adsorption-based separation of the ethane/methane mixture since they demonstrated a relatively strong dependence of selectivity coefficient (SF) on pressure and temperature. AUK showed the highest value of SF for ethane at low pressures (up to 5 bar), reaching 18 at 303 K for the mixture 95/5% CH 4 /C 2 H 6 . Finally, S-1 was found to be the most efficient adsorbent for the ethane/methane separation since it demonstrated a relatively high separation performance in a pressure range of 2−50 bar with almost no reduction in separation performance. In general, the SF value of ACs for ethane correlated with the difference between the initial differential isosteric heats of ethane and methane adsorption as well as with the presence of high-energy adsorption centers as narrow micropores with size less than 1 nm and heteroatoms (N,O). Molecular dynamics simulations of the adsorption of the methane/ethane mixture onto the model carbon adsorbents also indicated the influence of pore width on selective capacity.

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“…In addition to the AIS isotherm, we plotted the AIS of Sorbonorit-4 as a function of methane uptake. In the previous works, the plots Δ l / l 0 = f ( a ) at different temperatures were used for evaluating the impact of adsorption-induced deformation on the thermodynamic parameters of the adsorption system. , For example, the corrections from the thermally- and adsorption-induced deformations of the relatively rigid AC prepared from mineral coal attained about 10% …”

Section: Results and Discussionmentioning

confidence: 99%

Deformation of Microporous Carbon Adsorbent Sorbonorit-4 during Methane Adsorption

et al. 2022

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The temperature-and methane adsorption-induced deformations of microporous activated carbon Sorbonorit-4 were measured by in situ dilatometry over a wide range of temperatures and pressures. The thermal expansion coefficient of Sorbonorit-4 in vacuum increased linearly with temperature within a range of 293−573 K. Methane adsorption in Sorbonorit-4 induced its contraction at low pressures and temperatures or expansion at high temperatures throughout the entire pressure range. An inversion of the temperature dependence of adsorption-induced strain (AIS) of Sorbonorit-4 was found. At low pressures and temperatures below 300 K, the AIS isotherm showed a contraction of Sorbonorit-4; its magnitude and corresponding pressure interval decreased with temperature. At T > 300 K, the temperature rise was accompanied by an adsorption-induced expansion of Sorbonorit-4 up to 0.08% at 393 K. At high pressures, the expansion decreased from 0.45 to 0.13% when the temperature increased from 213 to 393 K. The AIS of Sorbonorit-4 and differential isosteric heat of adsorption presented as functions of methane uptake changed within the same intervals of adsorption values, reflecting variations in the state of adsorbed molecules determined by contributions from the adsorbate−adsorbent and adsorbate−adsorbate interactions. The obtained results are essential for practical use of carbon adsorbents for natural gas storage.

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Thermodynamics of methane adsorption on carbon adsorbent prepared from mineral coal

Cited by 11 publications

References 61 publications

Kinetic and Thermodynamic Characteristics of Supercritical Methane Adsorption on Organic-Rich Shale: A Case Study of Ordovician Wufeng and Silurian Longmaxi Gas Shale

Kinetic and Thermodynamic Characteristics of Supercritical Methane Adsorption on Organic-Rich Shale: A Case Study of Ordovician Wufeng and Silurian Longmaxi Gas Shale

Influence of Nanoporous Carbon Structures on High-Pressure Adsorption Separation of Light Hydrocarbons

Deformation of Microporous Carbon Adsorbent Sorbonorit-4 during Methane Adsorption

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