Joint analysis of pores in low, intermediate, and high rank coals using mercury intrusion, nitrogen adsorption, and nuclear magnetic resonance

Qin, Lei; Li, Shugang; Zhai, Cheng; Lin, Haiqing; Zhao, Pengxiang; Yan, Min; Ding, Yang; Yu, Shi

doi:10.1016/j.powtec.2019.12.019

Cited by 44 publications

(11 citation statements)

References 38 publications

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“…However, in this case, the excessive external force may pose the risk of deformation and damage to coal. Thus, this method cannot accurately measure the distribution of nanoscale pores [25].…”

Section: Introductionmentioning

confidence: 99%

Pore Structure Characteristics and Evolution Law of Different-Rank Coal Samples

et al. 2021

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In this study, the full-size pore structure characteristics of six different-rank coal samples were investigated and analyzed from three perspectives, namely, pore shape, pore volume, and pore specific surface area, by performing a high-pressure mercury injection experiment and a low-temperature nitrogen adsorption experiment. Next, the full-size pore volumes and pore specific surface areas of the six coal samples were accurately characterized through a combination of the two experiments. Furthermore, the relationships between volatile matter content and pore volume and between volatile matter content and pore specific surface area were fitted and analyzed. Finally, the influences of metamorphic degree on pore structure were discussed. The following conclusions were obtained. The pore shapes of different-rank coal samples differ significantly. With the increase of metamorphic degree, the full-size pore volume and pore specific surface area both decrease first and then increase. Among the pores with various sizes, micropores are the largest contributor to the full-size pore volume and pore specific surface area. The fitting curves between volatile matter content and pore volume and between volatile matter content and pore specific surface area can well reflect the influence and control of metamorphic degree on pore volume and pore specific surface area, respectively. With the increase of volatile matter content, the pore volume and the pore specific surface area both vary in a trend resembling a reverse parabola.

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Section: Introductionmentioning

confidence: 99%

Pore Structure Characteristics and Evolution Law of Different-Rank Coal Samples

et al. 2021

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“…The pore volume in coal is determined by its thermal maturity [71] such that increasing maturity increases the adsorption capacity [2]. Figure 2 presents pore size distribution curves for coals from low rank to high rank as obtained from nuclear magnetic resonance (NMR) analyses [72].…”

Section: Coal Pore Effectsmentioning

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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“…The curve of OGP0 shows an extrusion hysteresis in the high-pressure region (>4000 psia), and the hysteresis gradually diminishes as the SMS content increases in AGPs. Research reports that both open pores and semi-closed 'ink bottle' shaped (narrow-necked and bottle-shaped) pores can trigger mercury interception and mercury curve hysteresis, while those closed and normal semi-closed (throats with uniform width) pores cannot cause hysteresis loops 52 . Thus, compared to OGP, AGP is considered to have fewer accessible pores and/or narrow-necked pores due to the weaker hysteresis in its mercury intrusion and extrusion curves.…”

Section: Pore Structure Characteristics Of Agpmentioning

confidence: 99%

Molecular level hybridized hydrophobic ceramics for corrosion protection

Ruan¹,

Chen

Zhang

et al. 2022

Preprint

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Hydrophobic ceramics with low surface energies have a broad range of applications in both industry and domestic fields. However, the common surface-treatment-based hydrophobic ceramics are usually vulnerable and easy to lose functions due to surficial mechanical damages. To address this challenge, here we propose a new strategy to produce intrinsically hybrid hydrophobic ceramics by leveraging alkylated-geopolymerization. As proof-of-concept, we designed and synthesized an alkylated-geopolymer (AGP) based ceramic with excellent waterproof performance and damage tolerance. Microstructure characterizations reveal that this organic-inorganic hybrid ceramic contains hybridized inorganic aluminosilicate networks and the alkylated-silicate units at the molecular scale, offering benefits of high hydrophobicity and functional robustness. The geopolymerization-mediated synthetic route demonstrate here enables a facile access to robust hybrid coating materials for enduring protection of metallic surfaces from corrosion in thermal environments (< 350°C) with high humidity. Furthermore, our work also opens new avenues for designing of new functional ceramics from the molecular scale by a clean and low-cost procedure.

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Joint analysis of pores in low, intermediate, and high rank coals using mercury intrusion, nitrogen adsorption, and nuclear magnetic resonance

Cited by 44 publications

References 38 publications

Pore Structure Characteristics and Evolution Law of Different-Rank Coal Samples

Pore Structure Characteristics and Evolution Law of Different-Rank Coal Samples

Adsorption Factors in Enhanced Coal Bed Methane Recovery: A Review

Molecular level hybridized hydrophobic ceramics for corrosion protection

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