On the porous structure of coals: Evidence for an interconnected but constricted micropore system and implications for coalbed methane recovery

L. R. Radovic; V. C. Menon; C. A. Leon Y Leon; T. Kyotani; R. P. Danner; S. Anderson; P. G. Hatcher

doi:10.1007/BF01650133

On the porous structure of coals: Evidence for an interconnected but constricted micropore system and implications for coalbed methane recovery

L. R. Radovic, V. C. Menon, C. A. Leon Y Leon, T. Kyotani, R. P. Danner, S. Anderson, P. G. Hatcher

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Abstract

An experimental and theoretical study of adsorption and diffusion of carbon dioxide and methane in coals of widely varying rank was carried out. Low-pressure adsorption isotherms of CO₂ were obtained and analyzed using Dubinin's theory of volume filling of micropores. High-pressure adsorption isotherms of CH₄ were obtained and analyzed using tracer pulse chromatography in conjunction with an appropriate adsorption/diffusion model. A preliminary ¹²⁹Xe NMR analysis of chemical shifts experienced by xenon atoms in particles of different sizes is also reported. The heretofore undocumented and/or underestimated effects of activated diffusion of CO₂ at 273-298 K complicate the elucidation of the true microporous structure of coals, especially its dependence on coal rank. Activated diffusion of both CO₂ and methane at room temperature does not allow reliable estimates of coalbed gas content to be made. A model of an interconnected network of pores which includes randomly distributed, numerous and ultramicroporous constrictions (at any size scale) is consistent with all these experimental and theoretical findings.

Original language	English (US)
Pages (from-to)	221-232
Number of pages	12
Journal	Adsorption
Volume	3
Issue number	3
DOIs	https://doi.org/10.1007/BF01650133
State	Published - 1997

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Surfaces and Interfaces

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10.1007/BF01650133

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@article{43f65220c127483faa6672d70651db56,

title = "On the porous structure of coals: Evidence for an interconnected but constricted micropore system and implications for coalbed methane recovery",

abstract = "An experimental and theoretical study of adsorption and diffusion of carbon dioxide and methane in coals of widely varying rank was carried out. Low-pressure adsorption isotherms of CO2 were obtained and analyzed using Dubinin's theory of volume filling of micropores. High-pressure adsorption isotherms of CH4 were obtained and analyzed using tracer pulse chromatography in conjunction with an appropriate adsorption/diffusion model. A preliminary 129Xe NMR analysis of chemical shifts experienced by xenon atoms in particles of different sizes is also reported. The heretofore undocumented and/or underestimated effects of activated diffusion of CO2 at 273-298 K complicate the elucidation of the true microporous structure of coals, especially its dependence on coal rank. Activated diffusion of both CO2 and methane at room temperature does not allow reliable estimates of coalbed gas content to be made. A model of an interconnected network of pores which includes randomly distributed, numerous and ultramicroporous constrictions (at any size scale) is consistent with all these experimental and theoretical findings.",

author = "Radovic, {L. R.} and Menon, {V. C.} and {Leon Y Leon}, {C. A.} and T. Kyotani and Danner, {R. P.} and S. Anderson and Hatcher, {P. G.}",

note = "Funding Information: Partial support for this study was provided by the U.S. Department of Energy (Grant #DE-FG22-94-PC94216). Discussions with J.R. Hufton, J.L, Duda and I. Hadj Romdhane are gratefully acknowledged. The coal samples from the Penn State/DOE Sample and Data Bank, as well as core samples from the Valencia Canyon (REI series) and Black Creek (S series) seams, were kindly provided by Gareth Mitchell. The vitrinite sample was donated by Jonathan Mathews.",

year = "1997",

doi = "10.1007/BF01650133",

language = "English (US)",

volume = "3",

pages = "221--232",

journal = "Adsorption",

issn = "0929-5607",

publisher = "Springer Netherlands",

number = "3",

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TY - JOUR

T1 - On the porous structure of coals

T2 - Evidence for an interconnected but constricted micropore system and implications for coalbed methane recovery

AU - Radovic, L. R.

AU - Menon, V. C.

AU - Leon Y Leon, C. A.

AU - Kyotani, T.

AU - Danner, R. P.

AU - Anderson, S.

AU - Hatcher, P. G.

N1 - Funding Information: Partial support for this study was provided by the U.S. Department of Energy (Grant #DE-FG22-94-PC94216). Discussions with J.R. Hufton, J.L, Duda and I. Hadj Romdhane are gratefully acknowledged. The coal samples from the Penn State/DOE Sample and Data Bank, as well as core samples from the Valencia Canyon (REI series) and Black Creek (S series) seams, were kindly provided by Gareth Mitchell. The vitrinite sample was donated by Jonathan Mathews.

PY - 1997

Y1 - 1997

N2 - An experimental and theoretical study of adsorption and diffusion of carbon dioxide and methane in coals of widely varying rank was carried out. Low-pressure adsorption isotherms of CO2 were obtained and analyzed using Dubinin's theory of volume filling of micropores. High-pressure adsorption isotherms of CH4 were obtained and analyzed using tracer pulse chromatography in conjunction with an appropriate adsorption/diffusion model. A preliminary 129Xe NMR analysis of chemical shifts experienced by xenon atoms in particles of different sizes is also reported. The heretofore undocumented and/or underestimated effects of activated diffusion of CO2 at 273-298 K complicate the elucidation of the true microporous structure of coals, especially its dependence on coal rank. Activated diffusion of both CO2 and methane at room temperature does not allow reliable estimates of coalbed gas content to be made. A model of an interconnected network of pores which includes randomly distributed, numerous and ultramicroporous constrictions (at any size scale) is consistent with all these experimental and theoretical findings.

AB - An experimental and theoretical study of adsorption and diffusion of carbon dioxide and methane in coals of widely varying rank was carried out. Low-pressure adsorption isotherms of CO2 were obtained and analyzed using Dubinin's theory of volume filling of micropores. High-pressure adsorption isotherms of CH4 were obtained and analyzed using tracer pulse chromatography in conjunction with an appropriate adsorption/diffusion model. A preliminary 129Xe NMR analysis of chemical shifts experienced by xenon atoms in particles of different sizes is also reported. The heretofore undocumented and/or underestimated effects of activated diffusion of CO2 at 273-298 K complicate the elucidation of the true microporous structure of coals, especially its dependence on coal rank. Activated diffusion of both CO2 and methane at room temperature does not allow reliable estimates of coalbed gas content to be made. A model of an interconnected network of pores which includes randomly distributed, numerous and ultramicroporous constrictions (at any size scale) is consistent with all these experimental and theoretical findings.

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On the porous structure of coals: Evidence for an interconnected but constricted micropore system and implications for coalbed methane recovery

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