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Hong L, Lin J, Gao D, Zheng D, Wang W. Molecular simulation of the effect of water content on CO 2, CH 4, and N 2 adsorption characteristics of coal. Sci Rep 2024; 14:18190. [PMID: 39107362 PMCID: PMC11303678 DOI: 10.1038/s41598-024-69113-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2024] [Accepted: 07/31/2024] [Indexed: 08/10/2024] Open
Abstract
The objective of this work was to investigate the sorption behavior of gases, namely CO2, CH4, and N2, by molecules of coal sampled from Linglu mine under different water inclusion rates. To this end, the adsorption, diffusion, adsorption heat, and potential energy distribution characteristics of the gases in the coal pores at different water inclusion rates were analyzed using molecular dynamics and grand canonical ensemble Monte Carlo methods. The results showed that the adsorption relationship of the coal molecules on CO2, CH4, and N2 exhibited a downtrend followed by an uptrend when the water content was increased from 0 to 3.6%. The adsorption amount of CO2 was approximately twice as much as those of CH4 and N2, indicating that the competitive adsorption advantage of CO2 compared with those of CH4 and N2 was unaffected by the water content. The trend in the average heat of adsorption was generally consistent with the trend in the density of coal molecules under different moisture contents. Under the same conditions, the diffusion coefficient within a coal molecule was negatively related to the water content in the system. The layer spacing of the water molecules (2.875 Å) was greater than the liquid-water layer spacing, indicating the formation of a water molecule layer at this point, which inhibited gas adsorption. This study lays a theoretical foundation for further investigating the microscopic mechanism of coal-water interaction.
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Affiliation(s)
- Lin Hong
- College of Safety Science & Engineering, Liaoning Technical University, No.188 Longwan South Street, Huludao, 125105, Liaoning, China
- Key Laboratory of Mine Thermodynamic Disaster & Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China
| | - Jiaxing Lin
- College of Safety Science & Engineering, Liaoning Technical University, No.188 Longwan South Street, Huludao, 125105, Liaoning, China.
- Key Laboratory of Mine Thermodynamic Disaster & Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China.
| | - Dameng Gao
- College of Safety Science & Engineering, Liaoning Technical University, No.188 Longwan South Street, Huludao, 125105, Liaoning, China
- Key Laboratory of Mine Thermodynamic Disaster & Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China
- Institute of Mine Safety Technology, China Academy of Safety Science and Technology, Beijing, 100012, China
| | - Dan Zheng
- College of Safety Science & Engineering, Liaoning Technical University, No.188 Longwan South Street, Huludao, 125105, Liaoning, China
- Key Laboratory of Mine Thermodynamic Disaster & Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China
| | - Wenzhuo Wang
- Linglu Coal Mine of China Huaneng Group Co., Ltd., Beijing, China
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Kurth M, Javed M, Schliermann T, Brösigke G, Kämnitz S, Bhatia SK, Repke JU. Pure Hydrogen and Methane Permeation in Carbon-Based Nanoporous Membranes: Adsorption Isotherms and Permeation Experiments. MEMBRANES 2024; 14:123. [PMID: 38921490 PMCID: PMC11205412 DOI: 10.3390/membranes14060123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2024] [Revised: 05/16/2024] [Accepted: 05/21/2024] [Indexed: 06/27/2024]
Abstract
This paper presents the results of adsorption and permeation experiments of hydrogen and methane at elevated temperatures on a carbon-based nanoporous membrane material provided by Fraunhofer IKTS. The adsorption of pure components was measured between 90 °C and 120°C and pressures up to 45 bar. The Langmuir adsorption isotherm shows the best fit for all data points. Compared to available adsorption isotherms of H2 and CH4 on carbon, the adsorption on the investigated nanoporous carbon structures is significantly lower. Single-component permeation experiments were conducted on membranes at temperatures up to 220 °C. After combining the experimental results with a Maxwell-Stefan surface diffusion model, Maxwell-Stefan surface diffusion coefficients Dis were calculated. The calculated values are in line with an empirical model and thus can be used in future multi-component modeling approaches in order to better analyze and design a membrane system. The published adsorption data fill a gap in the available adsorption data for CH4 and H2.
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Affiliation(s)
- Matthis Kurth
- DBFZ Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, 116, 04347 Leipzig, Germany
| | - Mudassar Javed
- Dynamik und Betrieb Technischer Anlagen, Technische Universität Berlin, 10623 Berlin, Germany
| | - Thomas Schliermann
- DBFZ Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, 116, 04347 Leipzig, Germany
| | - Georg Brösigke
- Dynamik und Betrieb Technischer Anlagen, Technische Universität Berlin, 10623 Berlin, Germany
| | - Susanne Kämnitz
- Fraunhofer Institut für Keramische Technologien und Systeme IKTS, 07629 Hermsdorf, Germany
| | - Suresh K. Bhatia
- School of Chemical Engineering, University of Queensland, Brisbane 4072, Australia
| | - Jens-Uwe Repke
- Dynamik und Betrieb Technischer Anlagen, Technische Universität Berlin, 10623 Berlin, Germany
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Shkolin AV, Men’shchikov IE, Khozina EV, Yakovlev VY, Fomkin AA. Isotropic and anisotropic properties of adsorption-induced deformation of porous carbon materials. ADSORPTION 2022. [DOI: 10.1007/s10450-022-00370-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Shkolin AV, Strizhenov EM, Chugaev SS, Men’shchikov IE, Gaidamavichute VV, Grinchenko AE, Zherdev AA. Natural Gas Storage Filled with Peat-Derived Carbon Adsorbent: Influence of Nonisothermal Effects and Ethane Impurities on the Storage Cycle. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4066. [PMID: 36432352 PMCID: PMC9694911 DOI: 10.3390/nano12224066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/15/2022] [Accepted: 11/16/2022] [Indexed: 06/16/2023]
Abstract
Adsorbed natural gas (ANG) is a promising solution for improving the safety and storage capacity of low-pressure gas storage systems. The structural-energetic and adsorption properties of active carbon ACPK, synthesized from cheap peat raw materials, are presented. Calculations of the methane-ethane mixture adsorption on ACPK were performed using the experimental adsorption isotherms of pure components. It is shown that the accumulation of ethane can significantly increase the energy capacity of the ANG storage. Numerical molecular modeling of the methane-ethane mixture adsorption in slit-like model micropores has been carried out. The molecular effects associated with the displacement of ethane by methane molecules and the formation of a molecule layered structure are shown. The integral molecular adsorption isotherm of the mixture according to the molecular modeling adequately corresponds to the ideal adsorbed solution theory (IAST). The cyclic processes of gas charging and discharging from the ANG storage based on the ACPK are simulated in three modes: adiabatic, isothermal, and thermocontrolled. The adiabatic mode leads to a loss of 27-33% of energy capacity at 3.5 MPa compared to the isothermal mode, which has a 9.4-19.5% lower energy capacity compared to the thermocontrolled mode, with more efficient desorption of both methane and ethane.
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Affiliation(s)
- Andrey V. Shkolin
- Research Institute of Power Engineering, Bauman Moscow State Technical University, Baumanskaya 2-ya str. 5, 105005 Moscow, Russia
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii Prospect, 31, Build. 4, 119071 Moscow, Russia
| | - Evgeny M. Strizhenov
- Research Institute of Power Engineering, Bauman Moscow State Technical University, Baumanskaya 2-ya str. 5, 105005 Moscow, Russia
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii Prospect, 31, Build. 4, 119071 Moscow, Russia
| | - Sergey S. Chugaev
- Research Institute of Power Engineering, Bauman Moscow State Technical University, Baumanskaya 2-ya str. 5, 105005 Moscow, Russia
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii Prospect, 31, Build. 4, 119071 Moscow, Russia
| | - Ilya E. Men’shchikov
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii Prospect, 31, Build. 4, 119071 Moscow, Russia
| | - Viktoriia V. Gaidamavichute
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii Prospect, 31, Build. 4, 119071 Moscow, Russia
| | - Alexander E. Grinchenko
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii Prospect, 31, Build. 4, 119071 Moscow, Russia
| | - Anatoly A. Zherdev
- Research Institute of Power Engineering, Bauman Moscow State Technical University, Baumanskaya 2-ya str. 5, 105005 Moscow, Russia
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