Pore structure characterization of coal particles via MIP, N2 and CO2 adsorption: Effect of coalification on nanopores evolution

Jiang, Jingyu; Yang, Weiben; Wang, Chenghao; Zhao, Ke; Shi, Zheng

doi:10.1016/j.powtec.2019.05.080

Cited by 75 publications

(46 citation statements)

References 66 publications

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“…Therefore, BJH model was considered better for accurate determination of PSD, PV, and SSA of mesopores. On the other hand, BET model is widely used to obtain SSA of mesopores (Jiang et al, 2019a;Sun et al, 2015;Wang et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Later these isotherms were analyzed by Quenched Solid Density Functional Theory (QSDFT) to obtain PV and SSA of micropores. Frenkel-Halsey-Hill (FHH) model is the most effective method to calculate the fractal dimension of coal adsorption pore based on gas adsorption isotherm (Fu et al, 2017b;Jiang et al, 2019b;Wang et al, 2018). Therefore, the fracture features of coal samples were determined by the FHH model expressed in Eq.…”

Section: Methodsmentioning

confidence: 99%

“…QSDFT model is also favorable to determine the PSD of the micropores with pore size in the range of 0.35-1.50 nm, as depicted in Fig. 7 (Jiang et al, 2019a). PSDs of coal samples are mainly concentrated by ultramicropores, and a notable amount of super-micropores is also revealed.…”

Section: Analysis Of Micropores By Co 2 -Adsorptionmentioning

confidence: 99%

“…Capillary condensation occurs in mesopores with pore size larger than a certain critical size, which is mainly caused by adsorption metastable and/or pore network effect, and width of adsorption hysteresis loop increases with the increase of pore size (Barsotti et al, 2016b;Nie et al, 2015). With a gradual increase of relative pressure P/P 0 , the rise in the curve happens again, which results in capillary condensation during mesopores adsorption (Barsotti et al, 2016a;Jiang et al, 2019a). The presence of the hysteresis loop indicates that the evaporation in the pore is signi cantly different from the condensation in the pore and that capillary condensation occurs under mesopores (C. R. Wang et al, 2019).…”

Section: N 2 Adsorption Isothermsmentioning

confidence: 99%

“…The desorption branch of the isotherm of coal depends on the in uence of the pore network and various forms of pore blockage, thus re ecting the network structure characteristics of the pores (Jiang et al, 2019a). From Fig.…”

Section: N 2 Adsorption Isothermsmentioning

confidence: 99%

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Experimental Analysis of Pore Structure and Fractal Characteristics of Soft and Hard Coals With Same Coalification

Ullah

Cheng

Wang

et al. 2021

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Accurate and quantitative investigation of the physical structure and fractal geometry of coal has important theoretical and practical significance for coal bed methane and the prevention of dynamic disasters such as coal and gas outbursts. This study investigates the pore structure and fractural characteristics of soft and hard coals using nitrogen and carbon dioxide (N2/CO2) adsorption. Coal samples from Pingdingshan Mine in Henan province of China were collected and pulverized to the required size (0.2-0.25mm). N2/CO2 adsorption tests were performed to evaluate the pore size distribution (PSD), specific surface area (SSA), and pore volume (PV). The pore structure was characterized based on fractural theory. The results unveiled that the strength of coal has a significant influence on pore structure and fracture dimensions. The obvious N2-adsorption isotherms of the coals were verified as Type IV (A) and Type II. The shape of the hysteresis loops indicates the presence of slit-shaped pores. There are significant differences in SSA and PV between both coals. The soft coal showed larger SSA and PV than hard coal that shows consistency with adsorption capacity. The fractal dimensions of soft coal are respectively larger than that of hard coal. The greater the value of D1 (complexity of pore surface) of soft coal is, the larger the pore surface roughness and gas adsorption capacity is. The results enable us to conclude that the characterization of pores and fractures of soft and hard coals is different, tending to different adsorption/desorption characteristics and outburst sensitivity. In this regard, results provide a reference for formulating corresponding coal and gas outburst prevention and control measures.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Analysis Of Micropores By Co 2 -Adsorptionmentioning

confidence: 99%