Macromolecular insight into the adsorption and migration properties of CH4/CO2/N2 in bituminous coal matrix under uniaxial strain loading

Physics of Fluids, Год журнала: 2024, Номер 36(3)

Опубликована: Март 1, 2024

Gas adsorption–migration in coal is of crucial importance for coalbed methane (CBM) recovery; however, the effect deformation on it not yet very clear, especially at molecular level. In this study, effects uniaxial tension–compression strains CH4/CO2/N2 characteristics bituminous matrix were investigated by integrating grand canonical Monte Carlo and dynamics methods. The results show that dual-mode equation fits isothermal adsorption results, concentration Langmuir volume are positively correlated with strain. Tension strain has a small thermodynamic factor but large Henry constant. addition, swelling resistance tension which greater impact shear containing CO2. average mass density gas linearly N2 stability. More significantly, self-diffusion coefficient (Ds) CH4 larger than CO2/N2, relationship between Fick diffusion roughly similar to Ds Also, transfer CO2 permeation more significant compared N2, These research provide basis optimization design CBM recovery deformed reservoirs.

Язык: Английский

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Micropores enriched ultra-high specific surface area activated carbon derived from waste peanut shells boosting performance of hydrogen storage

International Journal of Hydrogen Energy, Год журнала: 2023, Номер 50, С. 324 - 336

Опубликована: Июль 25, 2023

Язык: Английский

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Enhancing hydrogen storage in MOF/graphene composites: The impact of graphene oxide and porous graphene oxide on adsorptive performance

Separation and Purification Technology, Год журнала: 2025, Номер unknown, С. 132313 - 132313

Опубликована: Фев. 1, 2025

Язык: Английский

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Engineering Microstructure of Ultraporous Carbon Aerogels as Advanced H₂ Sorbent Carriers

Chemistry of Materials, Год журнала: 2024, Номер unknown

Опубликована: Июль 15, 2024

In the face of urgent global challenges such as climate change, escalating energy demands, and security concerns, shift toward sustainable low-carbon is imperative. Hydrogen (H2), recognized a versatile clean carrier, holds significant promise key facilitator in achieving these objectives. However, H2 encounters becoming reliable carrier due to issues related density, ease storage, compatibility with existing infrastructure. This paper presents comprehensive investigation microstructure engineering high surface area carbon aerogels enhance uptake, addressing pivotal aspect storage applications. We report ultramicroporous via sol–gel CO2 supercritical drying methods, potential sorbent carriers. Microstructural analysis N2, Ar, physisorption measurements revealed that alteration through controlled pyrolysis, activation, pore-forming techniques facilitated formation ultramicropores favorable confinement effects which enhanced intermolecular interactions across pore walls efficient adsorption. The aerogels, regardless activation exhibited elevated areas between 2970 3200 m2/g volumes range 0.7–1.39 cm3/g, microporous ranging from 950 2610 m2/g. Notably, double-activated aerogel (CAT20-F25-KOH) demonstrated highest capacity 2.1 wt % 6.8 g/L under 298 K 100 bar pressure. At cryogenic temperature (77 K) pressure, CAT20-F25-KOH achieved capacities 28 g/L. These findings underscore role porosity chemistry sorbents for storage.

Язык: Английский

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Effect of 200 MPa-compressive hydrogens on the microstructure of diamond-like carbon coatings

Diamond and Related Materials, Год журнала: 2025, Номер unknown, С. 111971 - 111971

Опубликована: Янв. 1, 2025

Язык: Английский

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Carbon-based Lewis acid-base and Brønsted acid sites for efficient catalytic CO2 fixation under mild conditions

Carbon, Год журнала: 2025, Номер unknown, С. 120004 - 120004

Опубликована: Янв. 1, 2025

Язык: Английский

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Effect of Alkali Metal Functionalization on Hydrogen Storage Performance of Highly Porous Activated Carbons

Energy & Fuels, Год журнала: 2023, Номер 37(23), С. 19292 - 19303

Опубликована: Ноя. 15, 2023

With increasing energy demand and fast-paced decarbonization methods adopted to curb the adverse effects of greenhouse gas emissions, hydrogen (H2) is considered a sustainable, clean, potential renewable carrier for future. To substitute needs required physical H2 storage, adsorbed storage (AGS) next viable option that provides opportunity adsorb desorb gases under mild conditions. In this work, we studied effect light alkali metal functionalization comprising Li K on performance porous graphitic carbon adsorbents. The doping enthalpy adsorption enhancement uptake were systematically investigated. results showed an in gravimetric up 2.8 wt % at room temperature 100 bar pressure Li-doped 2.5 loading through enhanced electrostatic interactions. isosteric heat increased from 8.3 11.7 kJ/mol, suggesting dispersed cations form alkoxide (O–Li) species act as active centers capable anchoring molecules charge-quadrupole charge-induced dipole Furthermore, intercalation was found increase interlayer distance 3.87 4.09 Å. findings study demonstrate exhibits superior compared other metal-doped analogues.

Язык: Английский

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Effect of surface curvature on the hydrogen storage capacity of the Sc-, Ti-, and V-doped graphene surfaces: Theoretical study

Diamond and Related Materials, Год журнала: 2023, Номер 139, С. 110335 - 110335

Опубликована: Авг. 24, 2023

Язык: Английский

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Influence of nanopores volumes in hydrogen absorption properties of B4C and WC carbide-derived carbon nanomaterials

International Journal of Hydrogen Energy, Год журнала: 2023, Номер 52, С. 443 - 455

Опубликована: Апрель 20, 2023

Язык: Английский

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Prediction of hydrogen concentration responsible for hydrogen-induced mechanical failure in martensitic high-strength steels

International Journal of Hydrogen Energy, Год журнала: 2022, Номер 48(14), С. 5718 - 5730

Опубликована: Ноя. 30, 2022

Hydrogen, at critical concentrations, responsible for hydrogen-induced mechanical property degradation cannot yet be estimated beforehand and can only measured experimentally upon fracture with specific specimen sizes. In this work, we develop two deep learning artificial neural network (ANN) models the ability to predict hydrogen concentration early failure in martensitic ultra-high-strength steels. This family of steels is represented by four different encompassing chemical compositions heat treatments. The properties these varying size morphology prior austenitic grains as-supplied state after together their corresponding charging conditions were used as inputs. feed forward back propagation topologies 12-7-5-3-2-1 (I) 14-7-5-3-2-1 (II) validated tested unfamiliar data I II show good prediction capabilities mean absolute errors 0.28, 0.33 wt.ppm test datasets, respectively. A linear correlation 80% 77%, between ANN predicted was obtained Model shows that steels, estimation versus a feasible approach material safety analysis.

Язык: Английский

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