On the fundamental difference of adsorption-pores systems between vitrinite- and inertinite-rich anthracite derived from the southern Sichuan basin, China

Shan, Chang’an; Zhang, Tingshan; Liang, Xing; Zhang, Zhao; Wang, Meng; Zhang, Kun; Zhu, Haihua

doi:10.1016/j.jngse.2018.02.025

Cited by 23 publications

(16 citation statements)

References 52 publications

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“…However, many studies have indicated that a mismatching relationship exists between the methane adsorption capacity and SSA of coal and shale; that is, shale has a larger SSA but lower adsorption capacity (Figure ). This illogical mismatching relationship is due to the SSA in those references only tested by LP‐N 2 GA experiments, which cannot represent the true SSAs of the coal and shale samples. Figure illustrates this illogical mismatching relationship, which indicates that shales have a relatively large BET SSA but a much smaller adsorption capacity.…”

Section: Discussionmentioning

confidence: 99%

“…A mismatching relationship between the BET SSAs and methane adsorption capacities of coal and shale. Some data are cited from published articles…”

Section: Discussionmentioning

confidence: 99%

“…The methane adsorption capacity of coal is generally much larger than that of shale, with the difference in nanopore structure being one of the key factors for this difference in adsorption capacity. The SSA of porous media, such as coal, shale, and activated carbon, is the key parameter that influences the adsorption capacity of the adsorbents .…”

Section: Introductionmentioning

confidence: 99%

“…A larger SSA means the medium can provide more adsorption sites, resulting in a higher adsorption capacity . However, some studies have shown that a mismatching relationship between the methane adsorption capacities and SSAs of coal and shale exists, where coal has a smaller SSA but a stronger adsorption capacity. For example, Li et al indicated that the SSA of different‐rank coal samples is in the 0.059‐5.603 m 2 /g range, Shan et al demonstrated that vitrinite‐rich coals have an average SSA of 2.429 m 2 /g, and Tao et al found that the SSA of low‐rank coals is in the 0.19‐5.6 m 2 /g range, whereas many studies have shown that the SSA of the overmatured Longmaxi Formation shale can reach 10‐30 m 2 /g, which is obviously larger than that of coal.…”

Section: Introductionmentioning

confidence: 99%

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A comparative study of the nanopore structure characteristics of coals and Longmaxi shales in China

Zhou

Liu

Chen

et al. 2019

Energy Science & Engineering

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Both of the coalbed methane (CBM) and shale gas reservoirs are dominated by nanometer‐scale pores with their nanopore structures controlling the occurrence, enrichment, and accumulation of natural gas. Low‐pressure nitrogen gas adsorption (LP‐N2GA), low‐pressure carbon dioxide gas adsorption (LP‐CO2GA), high‐pressure methane adsorption (HPMA), and field emission scanning electron microscope (FE‐SEM) experiments were conducted on 14 different‐rank coal samples and nine Longmaxi shale samples collected from various basins in China to compare their nanopore characteristics. The FE‐SEM results indicate that the pore structures of both the coal and shale samples consist of nanometer‐sized pores that primarily developed in the organic matter. The types of their isothermal adsorption curves are similar. However, the coal and shale samples possess various hysteresis loops, which suggest that the nanopores in shale are open‐plated, whereas those in coal are semi‐open. Furthermore, the specific surface area (SSA) and pore volume (PV) of the micropores in coal are much larger than those of the mesopores, with the micropore SSAs accounting for 99% of the total SSA in the coal samples. However, the micropore SSAs in the shale samples only account 42.24% of the total SSA. These different nanopore structures reflect their different methane adsorption mechanisms. The methane adsorption of coal is primarily controlled by the micropore SSA, whereas that of shale is primarily controlled by the mesopore SSA. If we use mesopore SSA to analyze its impact on methane adsorption capacity of coal and shale, it will be mismatched. However, no mismatching relationship exists between the total SSAs and adsorption capacities of coal and shale. This study highlights the controlling effect of total SSA on methane adsorption capacity.

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Section: Discussionmentioning

confidence: 99%

“…A mismatching relationship between the BET SSAs and methane adsorption capacities of coal and shale. Some data are cited from published articles…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A comparative study of the nanopore structure characteristics of coals and Longmaxi shales in China

Zhou

Liu

Chen

et al. 2019

Energy Science & Engineering

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“…Such isotherm indicates the nonporous or macroporous nature of the studied TGSH [73]. This isotherm also indicated that mono-layer/multi-layer adsorption for nitrogen molecules occurred; the point of inflection from mono-(0 < P/P o < 0.6) to multi-layer (P/P o > 0.6) adsorption appeared at P/P o about 0.6 [63]. Also the overlapping of the two isotherm branches (adsorption/desorption) at P/P o < 0.6 reflects the poor connectivity between the semiclosed pores of the TGSH, while the separation between those branches at relatively higher pressure (P/P o > 0.6) indicates the presence of opened large pores in association with the semi-closed ones [50].…”

Section: Characterization Of Talc-graphite Schistmentioning

confidence: 62%

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

et al. 2020

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Talc-graphite schist (TGSH) is a natural organo-mineral complex that was derived from the regional metamorphism of organic matter-bearing calcareous clays under the lowest temperature and pressure of the green schist facies (573-632 K and 1-3 Kbars, respectively). The application of TGSH that is widely available in the Meatiq area (Eastern Desert, Egypt) was investigated for the first time ever in the remediation of methylene blue dye (MB) from aqueous solutions. The characterization of the TGSH was carried out using various techniques (XRF, XRD, SEM, FT-IR and BET surface area), and its MB removal capacity was estimated at different experimental conditions. The MB adsorption by TGSH was time-and pH-dependent process, where 120 min was sufficient enough to attain equilibrium. The MB adsorption capacity by the TGSH was directly proportional to the applied temperature, confirming that the MB adsorption process was endothermic in behavior. Based on the determination coefficients, the pseudo-second-order equation (R 2 = 0.939) explained MB adsorption data better than the first-order one (R 2 = 0.653). Meanwhile, intra-particle diffusion was not the sole controlling rate in MB removal by the TGSH. Moreover, the nonlinear regressions of Langmuir model (R 2 = 0.876) explained the equilibrium data better than the other applied models (Temkin, R 2 = 0.793, and Freundlich, R 2 = 0.752). On the other hand, the estimated q max (maximum removal capacity) of Langmuir was 9.41 mg/g at ambient temperature. Hydrogen bonding and electrostatic interaction were the governing mechanisms of MB removal by TGSH with variable impact in accordance with the prevailing pH condition.

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Sustainable Nano‐Nonwoven Fabric Production from Recycled Polyamide 6 Waste via Electrospinning: Controlling Characteristics and Comprehensive Analytical Study

Metwally

Zayed

Rashed

et al. 2023

Adv Materials Technologies

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This study investigates the recycling of polyamide 6 (PA 6) wastes to produce nonwoven fabrics based on nanofibers (PA‐NWNF) to promote sustainable textile solid waste management and generate a novel material with exceptional properties. PA‐NWNF characteristics can be controlled by adjusting the electrospinning parameters. A comprehensive characterization will be performed using various analytical techniques, such as scanning electron microscopy (SEM), Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and dynamic mechanical analysis (DMA), to evaluate the unique properties as a function of the electrospinning parameters. According to the SEM results, concentrations of 21% are suitable to produce nanofiber with a well‐defined morphology, provided that the applied voltage is maintained at 20 kV and the collecting distance is above 10 cm, irrespective of the flow rate in the established protocol. XRD and FTIR analysis indicate a gradual decrease in the α‐phase and a simultaneous increase in the γ‐phase as the solution concentration increases. Moreover, low applied voltage favored β‐form crystallization over γ and α‐forms predominant at the higher voltage. DMA and BET data reveal that the elongated droplets formed at lower concentration exhibit a low storage modulus, high damping factor, highest surface area, and smallest pore diameters.

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On the fundamental difference of adsorption-pores systems between vitrinite- and inertinite-rich anthracite derived from the southern Sichuan basin, China

Cited by 23 publications

References 52 publications

A comparative study of the nanopore structure characteristics of coals and Longmaxi shales in China

A comparative study of the nanopore structure characteristics of coals and Longmaxi shales in China

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

Sustainable Nano‐Nonwoven Fabric Production from Recycled Polyamide 6 Waste via Electrospinning: Controlling Characteristics and Comprehensive Analytical Study

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