Effect of ionic liquid treatment on pore structure and fractal characteristics of low rank coal

Zhao, Li; Guanhua, Ni; Sun, Lulu; Sun, Qing; Li, Shang; Dong, Kai; Xie, Ju; Wang, Gang

doi:10.1016/j.fuel.2019.116513

Cited by 105 publications

(29 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sensor based on Bi 2 Se 3 /BiOCl, which also showed an increased resistance upon NO 2 exposure, exhibited ~35 and ~12 times higher responses than BiOCl and Bi 2 Se 3 at 1 ppm, respectively (Figures 4(a) and 4(b)). In addition, the porous structure of the surface layer of the heterostructure resulted in a large specific surface area, which allowed more gas molecules to interact with the sensing material, but might cause a problem of slow gas desorption [58,59]. This was also reflected in the slower recovery times than response times (Figure S11).…”

Section: Resultsmentioning

confidence: 99%

Realization of Oriented and Nanoporous Bismuth Chalcogenide Layers via Topochemical Heteroepitaxy for Flexible Gas Sensors

et al. 2022

View full text Add to dashboard Cite

Most van der Waals two-dimensional (2D) materials without surface dangling bonds show limited surface activities except for their edge sites. Ultrathin Bi2Se3, a topological insulator that behaves metal-like under ambient conditions, has been overlooked on its surface activities. Herein, through a topochemical conversion process, ultrathin nanoporous Bi2Se3 layers were epitaxially deposited on BiOCl nanosheets with strong electronic coupling, leading to hybrid electronic states with further bandgap narrowing. Such oriented nanoporous Bi2Se3 layers possessed largely exposed active edge sites, along with improved surface roughness and film forming ability even on inkjet-printed flexible electrodes. Superior room-temperature NO2 sensing performance was achieved compared to other 2D materials under bent conditions. Our work demonstrates that creating nanoscale features in 2D materials through topochemical heteroepitaxy is promising to achieve both favorable electronic properties and surface activity toward practical applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Realization of Oriented and Nanoporous Bismuth Chalcogenide Layers via Topochemical Heteroepitaxy for Flexible Gas Sensors

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The fractal Frenkel-Halsey-Hill (FHH) model has been proven to be the most effective method for analyzing the fractal behavior of porous media 35 . The FHH model, which has been widely recognized and used 24 , 35 , 36 , can be described using the following equation 35 : where V is the quantity of adsorbed nitrogen gas at equilibrium pressure P, V 0 is the volume of monolayer coverage and P 0 is the saturation pressure.…”

Section: Discussionmentioning

confidence: 99%

“…8 and clearly show that the slopes of the FHH graphs of all samples are not uniform, so there is more than one fractal dimension. Based on previous studies 24 , 35 , 36 , the nitrogen adsorption isotherm can be divided into two main regions with a relative pressure of 0.5 (P/P 0 = 0.5), obtaining two fractal dimensions, D1 and D2. Region 1 is the monolayer-multilayer adsorption in which the dominant force is van der Waals, and D1 can be calculated from the slope of the line in region 1.…”

Section: Discussionmentioning

confidence: 99%

Semiquantitative microscopic pore characterizations of the metamorphic rock reservoir in the central paleo-uplift belt, Songliao Basin

Zeng

Shan

Hao

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Currently, metamorphic rock is a common target for natural gas exploration, and reservoirs are the key factors restricting natural gas exploration and development in metamorphic rocks. The deep metamorphic rock gas reservoir in the central paleo-uplift of the northern Songliao Basin has good exploration and development potential. In this study, we use a combination of qualitative descriptions and quantitative analysis to comprehensively analyze the pore characteristics of the reservoir and explore the factors controlling the pore characteristics of the metamorphic rock reservoir in the central paleo-uplift belt of the Songliao Basin. The metamorphic rock reservoir in the central paleo-uplift belt contains three types of lithologies: chlorite schist, mica schist and mylonite, each with different protoliths and metamorphic histories. The results of high-pressure mercury intrusion and nitrogen adsorption indicate that the pore size distributions of the schist and mylonite differ. Compared with the mylonite, the schist has larger reservoir space, more heterogeneity, smaller pore size, larger specific surface area and larger adsorbed gas storage capacity. This paper also studies the formation process of the reservoir and divides it into four stages. Finally, this article discusses in detail the factors controlling the microscopic pore characteristics of metamorphic rock reservoirs in the central paleo-uplift belt; the metamorphic rock protolith is the most important controlling factor.

show abstract

“…Methane usually exists in coals in two states: free gas and adsorbed gas 8,9 . The methane storage capacity of coal is affected by multiple internal and external factors, such as pore size distributions across the thermal evolution of coal from peat to anthracite, temperature, and pressure 10–13 . In terms of the pore structure of coal, previous studies have found that the number of micropores plays an important role in methane adsorption capacity 14–16 .…”

Section: Introductionmentioning

confidence: 99%

“…8,9 The methane storage capacity of coal is affected by multiple internal and external factors, such as pore size distributions across the thermal evolution of coal from peat to anthracite, temperature, and pressure. [10][11][12][13] In terms of the pore structure of coal, previous studies have found that the number of micropores plays an important role in methane adsorption capacity. [14][15][16] On this basis, Zhou et al 17 found that the adsorbed methane is stored not only in micropores but also in meso-macropores.…”

mentioning

confidence: 99%

Evaluation and analysis of methane adsorption capacity in deep‐buried coal seams

et al. 2022

View full text Add to dashboard Cite

In this work, the high‐pressure methane adsorption/desorption tests were conducted in four coal samples (from low‐rank bituminous coal to anthracite) under different temperature and pressure conditions to reveal the mechanism of desorption hysteresis effect in the deep‐buried coal seams. The experimental and fitting results show that the presence of free methane molecules in the adsorption phase results in an obvious difference between the measured methane adsorption amount with the actual adsorption capacity. The Langmuir, Langmuir–Freundlich (L–F) and Dubinin–Astakhov (D–A) models have their own advantages and disadvantages in fitting the experimental adsorption/desorption data. As residual adsorption capacity C fitted by the D–A model would be negative at high temperatures and lose the meaning of the constant, the Langmuir model is more suitable to describe methane desorption process. The residual adsorption capacity fitted by Langmuir model tended to decrease as the temperature increased until it is almost completely desorbed at 373 K. Meanwhile, because the adsorption sites with lower energy are gradually occupied by methane molecules in the high‐pressure stage, intermolecular forces increased and methane molecules are more easily desorbed. Therefore, the desorption hysteresis coefficient trends to increase exponentially with the decrease of pressure and temperature, which indicated that the original gas content of the coal seams may decrease with the increase of the burial depth, but the risk of coal and gas outburst accidents may increase. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

show abstract

Effect of ionic liquid treatment on pore structure and fractal characteristics of low rank coal

Cited by 105 publications

References 49 publications

Realization of Oriented and Nanoporous Bismuth Chalcogenide Layers via Topochemical Heteroepitaxy for Flexible Gas Sensors

Realization of Oriented and Nanoporous Bismuth Chalcogenide Layers via Topochemical Heteroepitaxy for Flexible Gas Sensors

Semiquantitative microscopic pore characterizations of the metamorphic rock reservoir in the central paleo-uplift belt, Songliao Basin

Evaluation and analysis of methane adsorption capacity in deep‐buried coal seams

Contact Info

Product

Resources

About