Difference between of coal and shale pore structural characters based on gas adsorption experiment and multifractal analysis

Fuel, Journal Year: 2024, Volume and Issue: 371, P. 132044 - 132044

Published: May 30, 2024

Language: Английский

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Hydrogen adsorption on calcite mineral surface in the presence of CO2 and CH4: A key factor in hydrogen storage in carbonate rocks

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 58, P. 583 - 595

Published: Jan. 26, 2024

Exploring underground hydrogen storage in carbonate-rich mineral formations as a viable option for large-scale demands thorough research of interaction complex subsurface environments. Therefore, this study employed Monte Carlo (MC) simulations to investigate the adsorption mechanism with calcite (CaCO3) presence geological fluids. This investigation was initiated by evaluating CO2 and CH4 validate simulation system. Later, concentration system systematically increased understand behavior mixed-gas competitive system, followed removal other gases evaluate pure under both dry water-wet conditions. The results showed that increasing pressure values up 2.65 mol/kg at 323 50 MPa without fully saturating surface. Meanwhile, temperature reduced affinity causing decrease Henry coefficient 2.14 403 K MPa. In addition, resulted development strong layers on surface, leading 50% adsorption. Also, introducing water film onto led an approximately 11% reduction due hydrophilic nature calcite. also found atoms including calcium, carbon, oxygen. These novel findings allow us better mechanisms molecular level, guiding future experiments reducing need extensive samples.

Language: Английский

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Hydrogen Adsorption in Porous Geological Materials: A Review

Sustainability, Journal Year: 2024, Volume and Issue: 16(5), P. 1958 - 1958

Published: Feb. 27, 2024

The paper adopts an interdisciplinary approach to comprehensively review the current knowledge in field of porous geological materials for hydrogen adsorption. It focuses on detailed analyses adsorption characteristics clay minerals, shale, and coal, considering effect factors such as pore structure competitive with multiple gases. fundamental principles underlying physically controlled storage mechanisms these matrices are explored. findings show that coal is predominantly governed by physical follows Langmuir equation. capacity decreases increasing temperature increases pressure. presence carbon dioxide methane affects hydrogen. Pore characteristics—including specific surface area, micropore volume, size—in crucial influence Micropores play a significant role, allowing molecules interact walls, leading increased enthalpy. This comprehensive provides insights into potential materials, laying groundwork further research development efficient sustainable solutions.

Language: Английский

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Experimental study on the competitive adsorption characteristics of N2, CO2 and O2 with various CO2/N2 blend ratios in coal

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 59, P. 924 - 936

Published: Feb. 13, 2024

Language: Английский

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Calculation of hydrogen adsorption isotherms and Henry coefficients with mixed CO2 and CH4 gases on hydroxylated quartz surface: Implications to hydrogen geo-storage

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 87, P. 111425 - 111425

Published: March 28, 2024

Hydrogen is a clean fuel that becoming increasingly popular in addressing future energy challenges, however, its viable storage requires an understanding of interaction with underground rock minerals. For this purpose, study focuses on developing adsorption isotherms and Henry coefficients for hydrogen hydroxylated quartz surfaces, which are predominant sandstone shale rocks. In study, molecular-scale structure pore space generated the Monte Carlo (MC) simulation utilized to assess coefficients. Initially, CO2 matched published data determine accuracy MC mineral-fluid interaction. After that, concentration H2 within progressively increased competitive calculated under various subsurface temperature pressure conditions. Additionally, CH4 introduced understand dynamics between CH4. The findings indicate increasing results molecules monotonically increase adsorption. On contrary, reduces affinity surface causing decrease capacity Furthermore, weak single layer developed at all conditions, while most remains as free gas pore. addition, hydroxyl group controls quartz. addition water film (approximately 1 wt%) by around 3 %. values further experience notable introduction CH4, primarily due establishment strong caused high electrostatic attraction these gases mineral. offers crucial microscopic details regarding alongside pores. These insights support efficient geo-storage larger-scale research.

Language: Английский

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Low-Carbon Advancement through Cleaner Production: A Machine Learning Approach for Enhanced Hydrogen Storage Predictions in Coal Seams

Renewable Energy, Journal Year: 2025, Volume and Issue: unknown, P. 122342 - 122342

Published: Jan. 1, 2025

Language: Английский

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Impacts of Residual Water and Salinity on Hydrogen Adsorption and its Distribution in Geological Minerals: Insights into Hydrogen Geostorage and Natural Production

Energy & Fuels, Journal Year: 2025, Volume and Issue: unknown

Published: March 8, 2025

Language: Английский

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Evolution of coal permeability during gas/energy storage

International Journal of Hydrogen Energy, Journal Year: 2023, Volume and Issue: 53, P. 1373 - 1386

Published: Dec. 21, 2023

Both carbon dioxide and hydrogen can be stored in coal seams as two enabling components of energy transition from fossil-based systems to renewable sources. In both cases, understanding the evolution permeability under influence gas adsorption is extremely important. The sorption-induced deformation commonly treated by analogous calculation thermal expansion. This assumption has long been proved inconsistent with observations reported literature. this study, we hypothesize that difference between reality due self-constrained/facilitated swelling phenomena during injection. Under new hypothesis, could constrained or facilitated depending on internal structures processes. A concept fictitious stress introduced quantify self-constrained degree converted into equivalent effective stress. conversion transformed conventional principle unconventional one. led generic model, which validated experimental data. An analysis state storage process conducted. Our results suggest our model a valuable tool for evaluation seams.

Language: Английский

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Atomistic simulation of dilute hydrogen in water-saturated kaolinite nanopores: Implications for underground hydrogen storage

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 109, P. 1358 - 1371

Published: Feb. 18, 2025

Language: Английский

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Mechanistic Studies of H2 Adsorption and Diffusion in Low-Rank Coals: A Discussion on Geologic Hydrogen Storage

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(7), P. 3932 - 3932

Published: April 3, 2025

An in-depth investigation of the adsorption and diffusion mechanism hydrogen in low-rank coals is great significance for optimizing technical path geological storage improving efficiency storage. Two kinds coal samples with a low metamorphic degree from Foran Coal Mine Sihe were used as adsorbents, molecular structure determined experimentally, H2 molecules was analyzed atomic level based on numerical simulation. It found that aliphatic carbon mainly links aromatic ring form branched chain exists an ring, side chain, or bridging carbon, lower deterioration coal, longer length alkane structure. The present polybenzene can provide more effective sites enhance by High specific surface area porosity will samples, while presence oxygen-containing functional groups strengthen interaction between microporous H2. These findings theoretical support application

Language: Английский

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