Experimental Study on the Pore Shape Damage of Shale Samples during the Crushing Process

Liu, Kouqi; Zakharova, Natalia; Adeyilola, Adedoyin; Zeng, Lianbo

doi:10.1021/acs.energyfuels.0c03297

Cited by 18 publications

(8 citation statements)

References 32 publications

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“…The transition in the isotherm type and changes in the surface area indicates a reduction in the pore size resulting from the introduction of dyes into the pores of the MOF. The substituted samples exhibit a hysteresis loop, H4 type, which indicates slit-shaped pores, which is in agreement with the presence of rigid flat xanthene-dyes in the pores [ 29 , 30 ]. Samples with lower surface area, those modified with rhodamine and rose bengal, showed a hysteresis below the p/p

limit reported for N

at 77K closure (p/p

∼0.42), indicating an irreversible change.…”

Section: Resultssupporting

confidence: 66%

Versatile Covalent Postsynthetic Modification of Metal Organic Frameworks via Thermal Condensation for Fluoride Sensing in Waters

et al. 2021

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Having access to safe drinking water is one of the 17 sustainable development goals defined by the United Nations (UN). However, many settlements around the globe have limited access to drinkable water due to non-anthropogenic pollution of the water sources. One of those pollutants is fluoride, which can induce major health problems. In this manuscript, we report on a post synthetic functionalization of metal organic frameworks for the sensing of fluoride in water. The proposed thermal condensation methodology allows for a high yield of functionalization using few steps, reducing reagent costs and generating minimal by-products. We identified a Rhodamine B functionalized Al-BDC-NH2 metal organic framework as one particularly suitable for fluoride detection in water.

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limit reported for N

at 77K closure (p/p

∼0.42), indicating an irreversible change.…”

Section: Resultssupporting

confidence: 66%

Versatile Covalent Postsynthetic Modification of Metal Organic Frameworks via Thermal Condensation for Fluoride Sensing in Waters

et al. 2021

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“…The coal samples with moisture contents less than 7.14% (corresponding to an RH of 85%) exhibit an inflection point in the desorption curve at a P / P 0 value of approximately 0.45, which is thought to be related to the presence of ink-bottle pores. 40 , 41 The desorption curves near the inflection point shrink as the moisture content increases. When the moisture content increases to the maximum equilibrium moisture content (10.88%), the inflection point of the desorption curve almost disappears.…”

Section: Experimental Resultsmentioning

confidence: 99%

Experimental Study of the Pore Structure and Gas Desorption Characteristics of a Low-Rank Coal: Impact of Moisture

Chen

Zhang

et al. 2022

ACS Omega

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Coal–water interactions have a prominent impact on the prediction of coal mine gas disasters and coalbed methane extraction. The change of characteristics in the microscopic pores of coal caused by the existence of water is an important factor affecting the diffusion and migration of gas in coal. The low-pressure nitrogen adsorption experiments and gas desorption experiments of a low-rank coal with different equilibrium moisture contents were conducted. The results show that both the specific surface area and pore volume decrease significantly as the moisture content increases, and the micropores (pore diameter <10 nm) are most affected by the water adsorbed by coal. In particular, for a water-equilibrated coal sample at 98% relative humidity, micropores with pore sizes smaller than 4 nm as determined by the density functional theory model almost disappear, probably due to the blocking effects of water clusters and capillary water. In this case, micropores with a diameter less than 10 nm still contribute most of the specific surface area for gas adsorption in coal. Furthermore, the fractal dimensions at relative pressures of 0–0.5 (D 1) and 0.5–1 (D 2) calculated by the Frenkel–Halsey–Hill model indicate that when the moisture content is less than 4.74%, D 1 decreases rapidly, whereas D 2 shows a slight reduction as the moisture content increased. In contrast, when the moisture content exceeds 4.74%, further increases in the moisture content cause D 2 to decrease significantly, while there is nearly no change for D 1. The correlation analyses show that the ultimate desorption volume and initial desorption rate are closely related to the fractal dimension D 1, while the desorption constant (K t) mainly depends on the fractal dimension D 2. Therefore, the gas desorption performances of coal have a close association with the pore properties of coal under water-containing conditions, which indicate that the fluctuation in moisture content should be carefully considered in the evaluation of gas diffusion and migration performances of in situ coal seams.

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“…In addition, all coal samples show a prominent adsorption hysteresis characteristics, the features of the hysteresis loop correspond to types H3 and H4 in the IUPAC classification (Thommes et al 2015), and its size tends to decrease with increasing moisture content. The coal samples with moisture content less than 7.14% (corresponding to RH of 85%) exhibit an inflection point of the desorption curve at the P/P0 around 0.45, which is considered to be related to the existence of ink-bottle pores (Liu et al 2021;Qi et al 2017). The desorption curve of coal sample around the inflection point gradually shrinks with moisture content increases.…”

Section: Ln2ga Isothermsmentioning

confidence: 99%

Experimental Study on Pore Structure and Gas Desorption Characteristics of a Low Rank Coal: Impact of Moisture

Yang

Chen

Tian

et al. 2021

Preprint

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Coal and gas outburst is one of the most serious disasters for underground coal mining. The water adsorbed on coal can leads to that the pore structure of moist coal is different from that of dry coal, thereby affecting methane desorption characteristics of coal for the outburst risk prediction. In this paper, the impact of moisture on pore structure and methane desorption performance were investigated. The analysis on low-temperature nitrogen gas adsorption tests show that the micropores (pore diameter < 10 nm) are most affected by the adsorbed water. In particular, for water-equilibrated coal sample at 98% relatively humidity, the micropores less than 4 nm analyzed by DFT pore size distributions almost disappear probably due to the blocking effect of the formed water clusters and capillary water. In this case, the micropores can still contributes most sites for gas adsorption. Furthermore, the fractal dimension at relative pressure of 0–0.5 (D1) and 0.5–1 (D2) calculated by the Frenkel-Halsey-Hill model indicates that, when moisture content is less than 4.74%, D1 decreases rapidly while D2 shows a slight change; whereas, further increases in moisture content results in that D2 decreases significantly and D1 remains at about 2.32. Further investigation shows that, below the equilibrium moisture content, the ultimate desorption volume (A) and initial desorption rate (V0) are closely related to D1, while the desorption constant (Kt) mainly depends on D2. Therefore, the adsorbed moisture has significant negative impact on methane desorption performances by affecting characteristics of coal’s pores.

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Experimental Study on the Pore Shape Damage of Shale Samples during the Crushing Process

Cited by 18 publications

References 32 publications

Versatile Covalent Postsynthetic Modification of Metal Organic Frameworks via Thermal Condensation for Fluoride Sensing in Waters

Versatile Covalent Postsynthetic Modification of Metal Organic Frameworks via Thermal Condensation for Fluoride Sensing in Waters

Experimental Study of the Pore Structure and Gas Desorption Characteristics of a Low-Rank Coal: Impact of Moisture

Experimental Study on Pore Structure and Gas Desorption Characteristics of a Low Rank Coal: Impact of Moisture

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