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Gases, Volume 2, Issue 1 (March 2022) – 1 article

Cover Story (view full-size image): Coal is still being used for a variety of purposes, one of them being coal bed methane (CBM), which is extracted from coal seams. Many investigations have shown that the CBM approach is ineffective at extracting methane. The approach of injecting gases into the coal seam has been proven to result in a maximum methane recovery of up to 90%. Enhanced coal bed methane (ECBM) recovery using gas injection can provide increased methane extraction depending on the characteristics of the coal and the gas that is used. Accurate prediction of the extent of gas adsorption by coal is therefore important. This review discusses the state of research developments regarding gas adsorption on coal surfaces and pores using experimental and simulation methods following the injection of CO2, N2, or CO2-N2 and examines coal gas adsorption characteristics to ECBM recovery. View this paper
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Review
Adsorption Factors in Enhanced Coal Bed Methane Recovery: A Review
Gases 2022, 2(1), 1-21; https://0-doi-org.brum.beds.ac.uk/10.3390/gases2010001 - 14 Jan 2022
Cited by 1 | Viewed by 736
Abstract
Enhanced coal bed methane recovery using gas injection can provide increased methane extraction depending on the characteristics of the coal and the gas that is used. Accurate prediction of the extent of gas adsorption by coal are therefore important. Both experimental methods and [...] Read more.
Enhanced coal bed methane recovery using gas injection can provide increased methane extraction depending on the characteristics of the coal and the gas that is used. Accurate prediction of the extent of gas adsorption by coal are therefore important. Both experimental methods and modeling have been used to assess gas adsorption and its effects, including volumetric and gravimetric techniques, as well as the Ono–Kondo model and other numerical simulations. Thermodynamic parameters may be used to model adsorption on coal surfaces while adsorption isotherms can be used to predict adsorption on coal pores. In addition, density functional theory and grand canonical Monte Carlo methods may be employed. Complementary analytical techniques include Fourier transform infrared, Raman spectroscopy, XR diffraction, and 13C nuclear magnetic resonance spectroscopy. This review summarizes the cutting-edge research concerning the adsorption of CO2, N2, or mixture gas onto coal surfaces and into coal pores based on both experimental studies and simulations. Full article
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