Influence of temperature on adsorption selectivity: Coal-based activated carbon for CH4 enrichment from coal mine methane

Zheng, Yuannan; Li, Qingzhao; Yuan, Chuangchuang; Tao, Qinglin; Zhao, Yang; Zhang, Guiyun; Liu, Junfeng

doi:10.1016/j.powtec.2019.02.042

Cited by 58 publications

(27 citation statements)

References 56 publications

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“…In contrast, TSA technology is better than PSA technology in improving the CH 4 purity, and TSA technology has a very obvious purification effect on gas with low‐concentration CH 4 . The reason may be that under the same experimental conditions, the isosteric heat of adsorption of CH 4 is always greater than that of N 2 , 54 which makes the CH 4 adsorption process more sensitive to temperature. Therefore, the influence of temperature change on the CH 4 adsorption capacity is greater than that of N 2 , in other words, the temperature change is more conducive to the separation of CH 4 /N 2 mixture.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of separation effect for CH₄ enrichment from coalbed methane (CBM) under the synergistic action of temperature and pressure based on IAST theory

Zheng

Zhang

et al. 2021

Greenhouse Gases

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The synergistic pressure and temperature swing adsorption (SPTSA) technology is designed for purifying coalbed methane (CBM) are proposed in this work. Cyclic processes including four steps: cooling, pressurization, heating, and depressurization. Ideal adsorption solution theory (IAST) was used to evaluate the separation effect. Super activated carbons (SACs) with specific surface area exceeds 3000 m2 g−1 were prepared and used as adsorbents. From 273 to 373 K, the adsorption selectivity (S) changes more than 4, while the S changes less than 2 with the pressure changes from 0.1 to 9 MPa, indicating that temperature change is more conducive to improve the CH4 purity compared to the pressure change. However, more CH4 purification capacity can be obtained by pressure change. In cyclic SPTSA process, the CH4 purification capacity is generally increased by more than 30% compared with the pressure swing adsorption technology, which indicated that CH4 separation and purification under the synergistic action of temperature and pressure is theoretically feasible and has a broad prospect in the CBM purification. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Evaluation of separation effect for CH₄ enrichment from coalbed methane (CBM) under the synergistic action of temperature and pressure based on IAST theory

Zheng

Zhang

et al. 2021

Greenhouse Gases

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“…The thermogenic formation of CBM results from kerogen or the cracking of heavier hydrocarbons and increases with depth [32]. Thermogenic processes that occur in deep coal [33] at higher pressures increase the coverage of the coal surface by the CBM and result in stronger interactions between adsorbate molecules [34]. Although the composition of coal bed gases does not have a strong relationship with either coal rank or depth, thermogenic generation usually begins in highly volatile bituminous rank coal and increases with rank [32].…”

Section: Methane In Coalmentioning

confidence: 99%

“…In contrast, higher pressures increase the coal adsorption capacity [100]. A higher pressure increases the adsorbate density and provides greater surface coverage and stronger interactions of the adsorbate molecules with the coal [34]. Thus, increasing the temperature is detrimental because this promotes gas desorption rather than adsorption [101].…”

Section: Gas Adsorptionmentioning

confidence: 99%

Adsorption Factors in Enhanced Coal Bed Methane Recovery: A Review

Tambaria

Sugai

Nguele

2022

Gases

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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.

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“…During gas extraction, adsorbed methane is first desorbed from the surface of micropores due to pressure drop (below a certain threshold), and then diffused into fractures to be extracted (Thararoop et al, 2012;Karimpouli et al, 2020). The sorption characteristics of methane are influenced by internal factors (pore-fracture structures, composition) as well as by reservoir conditions (temperature, pressure, moisture content), which will directly affect the gas yield (Liu et al, 2018;Zheng et al, 2019). Many scholars have conducted isothermal adsorption experiments on specimens under different conditions and clarified the factors influencing the sorption of methane and the mechanism of competitive adsorption between different molecules (Guo et al, 2013;Wang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Sorption characteristics in coal and shale: A review for enhanced methane recovery

2021

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The exploration and exploitation of hydrocarbon resources within coal and shale reservoirs is an engineering challenge. Well-developed internal micro-pore structures, complex sorption mechanism as well as numerous influencing factors affecting the gas flow are generally not well-accounted in the commercial life-cycle of shale gas and coalbed methane wells. Although large number of studies have been conducted to propose improved sorption models and study the influencing factors on adsorption and desorption characteristics of methane and CO 2 in coal and shale reservoirs, a systematic review of such studies for efficient understanding of the accumulated literature is missing, especially with a focus towards coal and shale reservoirs. In that context, this study presents a review of sorption characteristics of methane in coal and shale. Firstly, theoretical mechanisms for methane sorption are introduced, followed by description of sorption models. Further, three factors influencing the sorption of gas in coal and shale are described: total organic carbon and clays, pore structures, and reservoir conditions. Finally, the preferential sorption characteristics of hydrocarbons and carbon dioxide are described, and the methods to promote methane desorption for enhanced recovery are discussed, which include technologies such as gas injection, microwave heating, and hydraulic fracturing.

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Influence of temperature on adsorption selectivity: Coal-based activated carbon for CH4 enrichment from coal mine methane

Cited by 58 publications

References 56 publications

Evaluation of separation effect for CH₄ enrichment from coalbed methane (CBM) under the synergistic action of temperature and pressure based on IAST theory

Evaluation of separation effect for CH₄ enrichment from coalbed methane (CBM) under the synergistic action of temperature and pressure based on IAST theory

Adsorption Factors in Enhanced Coal Bed Methane Recovery: A Review

Sorption characteristics in coal and shale: A review for enhanced methane recovery

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Influence of temperature on adsorption selectivity: Coal-based activated carbon for CH4 enrichment from coal mine methane

Cited by 58 publications

References 56 publications

Evaluation of separation effect for CH4 enrichment from coalbed methane (CBM) under the synergistic action of temperature and pressure based on IAST theory

Evaluation of separation effect for CH4 enrichment from coalbed methane (CBM) under the synergistic action of temperature and pressure based on IAST theory

Adsorption Factors in Enhanced Coal Bed Methane Recovery: A Review

Sorption characteristics in coal and shale: A review for enhanced methane recovery

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Product

Resources

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Evaluation of separation effect for CH₄ enrichment from coalbed methane (CBM) under the synergistic action of temperature and pressure based on IAST theory

Evaluation of separation effect for CH₄ enrichment from coalbed methane (CBM) under the synergistic action of temperature and pressure based on IAST theory