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To study the importance of the adsorption mechanism of methane (CH) and carbon dioxide (CO) in coal for coalbed methane development, we aimed to reveal the influence mechanism of adsorption pressure, temperature, gas properties, water content, and other factors on gas molecular adsorption behavior from the molecular level. In this study, we selected the nonsticky coal in Chicheng Coal Mine as the research object. Based on the coal macromolecular model, we used the molecular dynamics (MD) and Monte Carlo (GCMC) methods to simulate and analyze the conditions of different pressure, temperature, and water content. The change rule and microscopic mechanism of the adsorption amount, equal adsorption heat, and interaction energy of CO and CH gas molecules in the coal macromolecular structure model establish a theoretical foundation for revealing the adsorption characteristics of coalbed methane in coal and provide technical support for further improving coalbed methane extraction.
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http://dx.doi.org/10.3390/molecules28083302 | DOI Listing |
ACS Omega
August 2025
159nd team of Guizhou Coalfield Geological Bureau, Guiyang, Guizhou 550081, China.
Guizhou Province is an important late Permian coal-producing area in China, and the resource potential of critical metal elements in its coal urgently needs to be studied. This paper systematically analyzes the geochemical characteristics of REY (rare earth elements and Y) in the No. 12 coal seam of the Late Permian Tucheng Mine in Guizhou Province using technologies such as inductively coupled plasma mass spectrometry (ICP-MS), X-ray fluorescence spectroscopy (XRF), scanning electron microscopy with energy dispersive spectrometry (SEM-EDS), and correlation analysis and discusses the environmental indication significance of REY (rare earth elements and Y) in coal.
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August 2025
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China.
Accurate prediction of permeability can be of great help in the exploitation of coal-bed methane resources. Based on the representative element volume (REV) and cubic law, a series of novel permeability models have been derived in this study, which can be categorized into the model sets of cubic law equivalent (CLE), constant matrix width (CMW), and constant REV volume (CRV), enabling a more realistic representation of the mesoscale deformation behavior of coal under stress environments. The CLE model set containing the real strain relations matches the experimental data better than the CMW model set containing the simplified strain relations.
View Article and Find Full Text PDFJ Microsc
August 2025
Institute of Geological Resources and Environment, Anhui Provincial Coal Geological Exploration Bureau Third Team, Suzhou, China.
The pore structure characteristics of coal are crucial for coalbed methane adsorption and migration, carbon storage, and safety in deep coal mining. Although traditional methods can detect pore volume and distribution, they are limited in analysing pore morphology and surface properties. This study employs multiscale techniques including AFM (Atomic force microscopy), SEM (Scanning electron microscopy), and LP-NGA (Low-Pressure nitrogen gas adsorption) to systematically analyse the impact of coal rank changes on pore structure and its evolutionary process, covering coals from medium-volatile to low-volatile bituminous and anthracite coals.
View Article and Find Full Text PDFInorg Chem
September 2025
School of Materials Science and Engineering, Nankai University, Tianjin 300350, China.
The extraction of methane (CH) from coal-bed gas represents a promising yet technically challenging process, primarily due to the nearly identical molecular sizes and physical properties of CH and nitrogen (N), which complicate their separation. Herein, we developed a highly stable Ni cluster-based metal-organic framework (Ni-MOF) with excellent acid-base stability for selectively separating CH/N mixtures. Ni-MOF contains multiple binding sites including open metal sites, low-polarity methyl groups, nonpolar benzene rings, and exposed oxygen atoms in its two-dimensional (2D) cross-linked zigzag channels.
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August 2025
Department of Petroleum Engineering, Dr. Vishwanath Karad MIT World Peace University, Pune 411038, India.
This study presents the work carried out to evaluate the effectiveness of closely spaced infill wells in enhancing recovery from a mature coal bed methane (CBM) field. The primary objective was to assess the potential for increasing gas production rates, accelerating reserve monetization, and improving the overall recovery efficiency in an unconventional reservoir setting. The authors utilized an integrated approach combining core-hole data, geological and geophysical models, historical production performance, and a history-matched dynamic reservoir model to support technical decisions.
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