Pore distribution characteristics of various rank coals matrix and their influences on gas adsorption

Yan, Jiwei; Meng, Zhaoping; Zhang, Kun; Yao, Hongxun; Hao, Haijin

doi:10.1016/j.petrol.2020.107041

Cited by 67 publications

(50 citation statements)

References 69 publications

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“…The pore volume increases with the increasing coal rank. This is consistent with experimental results . For low rank and middle rank, −C 2 O groups exhibit the highest V F and S S A , followed by −OH, −CH 3 , and −Ori; the V F and S S A of −OH and −CH 3 are close to each other, and −CO has the lowest V F and S S A .…”

Section: Results and Discussionsupporting

confidence: 90%

Effects of Pore Parameters and Functional Groups in Coal on CO₂/CH₄ Adsorption

Dong

Zhai²,

Guo

2021

ACS Omega

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The mechanisms of CO 2 /CH 4 adsorption in coal are the theoretical foundation for CO 2 sequestration in coal seams targeted for enhanced coalbed methane recovery. Herein, by changing the model (low rank coal: WMC, middle rank coal: XM and high rank coal: CZ) with plenty of side aliphatic chains and functional groups established in the literature, the influence and mechanism of pore parameters and functional groups(−CH 3 , − OH, −C 2 O, −C=O) on the adsorption of CO 2 and CH 4 in different rank coals are systematically studied. Using the Connolly surface algorithm to calculate the pore volume (V F ) and the specific surface area (S SA ) of coal with different functional groups, it can be seen that the influence of the functional group change on the pore structure is related to the coal rank. Changing the various functional groups in the original coal structure to a unified functional group (−CH 3 , −OH, −C 2 O, or −CO) will increase the accessible pore volume (V F ) and the specific surface area (S SA ), except in low-rank and middle-rank coal, where the ordered arrangement of −CO will decrease V F and S SA . The adsorption capacities of different pore parameters and functional groups were calculated by Grand Canonical Monte Carlo simulation and density functional theory. On pure adsorption, the pore parameters exert greater influence than the functional groups. By comparing the adsorption energy of the original pore structure containing functional groups and that of modified pores without functional groups, the contributions of the pore structure and original functional groups on CO 2 /CH 4 adsorption are 71 and 29% and 83 and 17%, respectively. Small-diameter pores and −C 2 O have a strong adsorption capacity. In terms of competitive adsorption, the −C O functional groups and pore diameters ranging from 1.0 to 2.0 nm can significantly enhance the selectivity of CO 2 over CH 4 . The CH 4 and CO 2 adsorption does not occur via rigorous monolayer adsorption; multilayer adsorption can occur for CH 4 and CO 2 with pore diameters of 1.0−2.0 and 1.0−2.2 nm, respectively, thus causing micropore filling. These quantitative results establish a foundation for the development of adsorption theory for CO 2 /CH 4 in coal.

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Section: Results and Discussionsupporting

confidence: 90%

Effects of Pore Parameters and Functional Groups in Coal on CO₂/CH₄ Adsorption

Dong

Zhai²,

Guo

2021

ACS Omega

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“…Methane is found in coal bed as absorbed and adsorbed from the latter constitutes 90% of the total amount of gas (Yee, Seidle et al 1993, Evans, Budwill et al 2020. The quantity of gas present in coal is known as gas content, and it depends on coal geology, seam thickness, depth of burial, igneous intrusions, and bounding strata type (Crosdale, Beamish et al 1998, Kiani, Sakurovs et al 2018, Yan, Meng et al 2020. Methane evolution in coal is a two-step process biogenic (microbial activity) and thermogenic (cracking of organic matter).…”

Section: Assessment Of Gas Contentmentioning

confidence: 99%

Petrophysical Investigation of Hydrocarbon Generation Potential of Coal from Raniganj Basin, India

Panwar¹,

Chaurasia

Saxena

et al. 2021

Preprint

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Methane content in a coal seam is a necessary parameter for evaluating coal bed gas, and it is a threat to underground coal mining activities from environmental aspects. Keeping in pace with comprehensive studies of coal bed gas, the authors had selected 12 coal samples from the Sitarampur block of Raniganj Coalfield. The Petrographic examination illustrated that significant values of reactive macerals present in samples demonstrate that organic matter is dominated by kerogen Type III, making it suitable for hydrocarbon generation. “A” factor (aliphatic/aromatic bands) and “C” factor (carbonyl/carboxyl bands) value concluded that the sample has the lowest aromaticity and the highest hydrocarbon-generating potential, which also validated by the cross plot between atomic H/C and O/C. The plots between the H/C and O/C ratio in the Van Krevelen diagram indicate that the coal samples lie in the type III kerogen, and bituminous coal (gas prone zone) is present in the block, which confirmed by the cross plot between desorbed and total gas (cc/g). The in-situ gas content values are high enough to produce methane from coal beds. The overall study concludes that the Sitarampur block from Raniganj Coalfield is suitable for hydrocarbon generation and extraction.

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“…Methane is found in coal bed as absorbed and adsorbed from the latter constitutes 90% of the total amount of gas (Evans et al 2020;Yee et al 1993). The quantity of gas present in coal is known as gas content, and it depends on coal geology, seam thickness, depth of burial, igneous intrusions, and bounding strata type (Crosdale et al, 1998;Kiani et al, 2018;Yan et al, 2020). Methane evolution in coal is a two-step process biogenic (microbial activity) and thermogenic (cracking of organic matter).…”

Section: Assessment Of Gas Contentmentioning

confidence: 99%

Geochemical investigation of hydrocarbon generation potential of coal from Raniganj Basin, India

Panwar

Chaurasia

Saxena

et al. 2021

J Petrol Explor Prod Technol

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Methane content in a coal seam is a necessary parameter for evaluating coal bed gas, and it poses an environmental risk to underground coal mining activities. Keeping in pace with comprehensive studies of coal bed gas, 12 coal samples were selected from the Sitarampur block of Raniganj Coalfield for analysis. The Petrographic examination illustrated that significant values of reactive macerals present in samples demonstrate that organic matter is dominated by the prominent source of aromatic hydrocarbons with a minor proportion of aliphatic hydrocarbon, which falls in the region of (Type III) kerogen, confirms the suitability for the potential of hydrocarbon generation. “A” factor (aliphatic/aromatic bands) and “C” factor (carbonyl/carboxyl bands) value concluded that the sample has the lowest aromaticity and the highest hydrocarbon-generating potential, which was also validated by the Van Krevelen diagram. The Van Krevelen diagram plots between the H/C and O/C ratio indicate that coal samples lie in the type III kerogen, and bituminous coal (gas prone zone) is present in the block, which is confirmed by the cross-plot between desorbed and total gas (cc/g). The in situ gas content values are high enough to produce methane from coal beds. The overall study concludes that the Sitarampur block from Raniganj Coalfield is suitable for hydrocarbon generation and extraction.

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Pore distribution characteristics of various rank coals matrix and their influences on gas adsorption

Cited by 67 publications

References 69 publications

Effects of Pore Parameters and Functional Groups in Coal on CO₂/CH₄ Adsorption

Effects of Pore Parameters and Functional Groups in Coal on CO₂/CH₄ Adsorption

Petrophysical Investigation of Hydrocarbon Generation Potential of Coal from Raniganj Basin, India

Geochemical investigation of hydrocarbon generation potential of coal from Raniganj Basin, India

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Pore distribution characteristics of various rank coals matrix and their influences on gas adsorption

Cited by 67 publications

References 69 publications

Effects of Pore Parameters and Functional Groups in Coal on CO2/CH4 Adsorption

Effects of Pore Parameters and Functional Groups in Coal on CO2/CH4 Adsorption

Petrophysical Investigation of Hydrocarbon Generation Potential of Coal from Raniganj Basin, India

Geochemical investigation of hydrocarbon generation potential of coal from Raniganj Basin, India

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Product

Resources

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Effects of Pore Parameters and Functional Groups in Coal on CO₂/CH₄ Adsorption

Effects of Pore Parameters and Functional Groups in Coal on CO₂/CH₄ Adsorption