Changes in pore structure of coal caused by coal-to-gas bioconversion

Abstarct Microbial enhanced coalbed methane (ME-CBM) recovery is critically examined as a viable technology for natural gas recovery from coalbed methane (CBM) reservoirs. Since the majority of gas-in-place (GIP) is stored as an adsorbed phase in fine pores of coal matrix, the nano-pore structure di...

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Autores principales:	Rui Zhang, Shimin Liu, Jitendra Bahadur, Derek Elsworth, Yi Wang, Guanglong Hu, Yanna Liang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0b012404b2514fc0bbc2cb828ce662fe
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spelling	oai:doaj.org-article:0b012404b2514fc0bbc2cb828ce662fe2021-12-02T11:53:04ZChanges in pore structure of coal caused by coal-to-gas bioconversion10.1038/s41598-017-04110-z2045-2322https://doaj.org/article/0b012404b2514fc0bbc2cb828ce662fe2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04110-zhttps://doaj.org/toc/2045-2322Abstarct Microbial enhanced coalbed methane (ME-CBM) recovery is critically examined as a viable technology for natural gas recovery from coalbed methane (CBM) reservoirs. Since the majority of gas-in-place (GIP) is stored as an adsorbed phase in fine pores of coal matrix, the nano-pore structure directly influences gas storage and transport properties. Only limited studies have quantified the alteration of the nano-pore structure due to ME-CBM treatment. This study examines the evolution of the pore structure using a combination of small angle X-ray scattering (SAXS), low-pressure N2 and CO2 adsorption (LPGA) and high-pressure methane adsorption methods. The results show that the surface fractal dimension decreases for the two bioconverted coals compared to the untreated coal. After bio-treatment, the mesopore surface area and pore volume decrease with the average pore diameter increases, while the micropore surface area increases with pore volume decreases. Both inaccessible meso-/micropore size distributions decrease after bioconversion, while the accessible micropore size distribution increases, making a portion of closed micropore network accessible. In addition, the methane adsorption capacities increase after bio-treatment, which is confirmed by the increase of micropore surface area. A conceptual physical model of methanogenesis is proposed based on the evolution of the pore structure.Rui ZhangShimin LiuJitendra BahadurDerek ElsworthYi WangGuanglong HuYanna LiangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-13 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Rui Zhang Shimin Liu Jitendra Bahadur Derek Elsworth Yi Wang Guanglong Hu Yanna Liang Changes in pore structure of coal caused by coal-to-gas bioconversion
description	Abstarct Microbial enhanced coalbed methane (ME-CBM) recovery is critically examined as a viable technology for natural gas recovery from coalbed methane (CBM) reservoirs. Since the majority of gas-in-place (GIP) is stored as an adsorbed phase in fine pores of coal matrix, the nano-pore structure directly influences gas storage and transport properties. Only limited studies have quantified the alteration of the nano-pore structure due to ME-CBM treatment. This study examines the evolution of the pore structure using a combination of small angle X-ray scattering (SAXS), low-pressure N2 and CO2 adsorption (LPGA) and high-pressure methane adsorption methods. The results show that the surface fractal dimension decreases for the two bioconverted coals compared to the untreated coal. After bio-treatment, the mesopore surface area and pore volume decrease with the average pore diameter increases, while the micropore surface area increases with pore volume decreases. Both inaccessible meso-/micropore size distributions decrease after bioconversion, while the accessible micropore size distribution increases, making a portion of closed micropore network accessible. In addition, the methane adsorption capacities increase after bio-treatment, which is confirmed by the increase of micropore surface area. A conceptual physical model of methanogenesis is proposed based on the evolution of the pore structure.
format	article
author	Rui Zhang Shimin Liu Jitendra Bahadur Derek Elsworth Yi Wang Guanglong Hu Yanna Liang
author_facet	Rui Zhang Shimin Liu Jitendra Bahadur Derek Elsworth Yi Wang Guanglong Hu Yanna Liang
author_sort	Rui Zhang
title	Changes in pore structure of coal caused by coal-to-gas bioconversion
title_short	Changes in pore structure of coal caused by coal-to-gas bioconversion
title_full	Changes in pore structure of coal caused by coal-to-gas bioconversion
title_fullStr	Changes in pore structure of coal caused by coal-to-gas bioconversion
title_full_unstemmed	Changes in pore structure of coal caused by coal-to-gas bioconversion
title_sort	changes in pore structure of coal caused by coal-to-gas bioconversion
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0b012404b2514fc0bbc2cb828ce662fe
work_keys_str_mv	AT ruizhang changesinporestructureofcoalcausedbycoaltogasbioconversion AT shiminliu changesinporestructureofcoalcausedbycoaltogasbioconversion AT jitendrabahadur changesinporestructureofcoalcausedbycoaltogasbioconversion AT derekelsworth changesinporestructureofcoalcausedbycoaltogasbioconversion AT yiwang changesinporestructureofcoalcausedbycoaltogasbioconversion AT guanglonghu changesinporestructureofcoalcausedbycoaltogasbioconversion AT yannaliang changesinporestructureofcoalcausedbycoaltogasbioconversion
_version_	1718394848985219072

Changes in pore structure of coal caused by coal-to-gas bioconversion

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