Pore Structure of the Argonne Premium Coals

Larsen, John W.; Hall, Peter; Wernett, P.C.

doi:10.1021/ef00050a018

Cited by 92 publications

(120 citation statements)

References 4 publications

(4 reference statements)

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“…The same conclusion can be inferred from the work of Larsen et al 24 Another significant characteristic that can be drawn from the results of the TW series is that the adsorption of CO 2 tends to decrease with the increase in the density of separation, i.e. more microporous material is found at lower relative densities.…”

Section: Adsorption Isotherms In Cosupporting

confidence: 79%

Textural properties in density-separated coal fractions

Rubiera

Parra

Arenillas

et al. 1999

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The results presented in this work are part of a more extensive research program aimed at assessing the impact of coal porous structure on density-based process evaluation and modelling. The coal samples used were obtained from two different density-based cleaning processes, a Vorsyl dense medium separator for treating an anthracite (TW) with a size fraction of 0.5-8.0 mm and a spiral concentrator for treating a bituminous coal (DH) with a size of less than 2 mm. Textural characterisation of the samples was carried out by measuring true (helium) and apparent (mercury) densities and mercury porosimetry up to a maximum pressure of 200 MPa. Adsorption isotherms in CO 2 at 273 K were also determined for both coal series. In the case of the bituminous coal series a linear relationship between porosity and ash content was found. This may have important implications if coal porosity and/or textural parameters need to be incorporated into new density-based simulation models.

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Section: Adsorption Isotherms In Cosupporting

confidence: 79%

Textural properties in density-separated coal fractions

Rubiera

Parra

Arenillas

et al. 1999

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“…The specific surface areas of NOM based on CO 2 adsorption differ significantly from those using N 2 adsorption, primarily due to the molecular sieving phenomenon (De Jonge and Mittelmeijer-Hazeleger, 1996;Xing and Pignatello, 1997). Some internal pores of organic matrices can not be approached by N 2 (Gan et al, 1972;Larsen et al, 1995). Carbon dioxide at 273 K and benzene at 295 K have been used as alternative gases for probing the surface properties of carbonaceous materials (Corley et al, 1996;De Jonge and Mittelmeijer-Hazeleger, 1996;Kwon and Pignatello, 2005;Ravikovitch et al, 2005;Xing and Pignatello, 1997).…”

Section: Introductionmentioning

confidence: 99%

Sorption of phenanthrene and benzene on differently structural kerogen: Important role of micropore-filling

Ran

2014

Environmental Pollution

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“…where n ex is the experimentally measured amount of adsorption, q is the density of the gas phase, q a is the density of the adsorbed phase, n o is the adsorption/micropore capacity, b is the affinity coefficient between CO 2 and the coal (b = 0.35 for CO 2 ) [40], E o is the characteristic heat of adsorption, j is the structural heterogeneity parameter, P s is the saturation pressure, R is the universal gas constant, T is the temperature, and DV is the unaccounted-for volume due to the gas solubility in the coal matrix, to the coal swelling, and to any over-or under-estimation of the void volume (V o ) in the sample cell due to the assumptions underlying the choice of helium as the reference gas in the adsorption experiments [41][42][43][44][45][46]. The saturation pressure (P s ) and the density of the adsorbed phase (q a ) were calculated using the relationships suggested by Reid et al [47] and Dubinin [48], respectively.…”

Section: Evaluation Of the Adsorption Isotherm Datamentioning

confidence: 99%

Role of pH on CO2 sequestration in coal seams

Ozdemir

2016

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a b s t r a c tThe effect of acidic or basic pre-treatment on the adsorption capacity of CO 2 on coals was investigated. Argonne Premium Pocahontas No. 3, Upper Freeport, Pittsburgh No. 8, Blind Canyon, Illinois No. 6, Wyodak, and Beulah-Zap coals were washed in weak solutions of H 2 SO 4 and NaOH to the pH values of 10, 7, and 2, after an initial washing in acidic water. Attempts to treat the Wyodak and Beulah-Zap coals were unsuccessful because the base treatment after the initial acid treatment resulted in a suspension which could be separated neither via filtration through a 45 lm filter nor centrifugation. Equilibration took several days in some cases, although the as-received coal had been ground to 150 lm. Acid washing preferentially removed Ca (calcite) and Mg. Aluminosilicate clays were not notably removed. Iron was removed in significant amounts only after base treatment, possibly after it was converted to hematite. The adsorption capacity of CO 2 on the acid treated coals was higher than both the base treated and untreated coals. The difference in adsorption capacities for acid and base treated coals was related to the pore sizes and mineral matter removal from the coals, where the calculated average pore size was higher for acid treated coals than for the base treated coals. It is concluded that the pH decrease due to CO 2 dissolution in cleat water is favored in coal seam sequestration, which resulted in an increase in storage capacity of coals.

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Pore Structure of the Argonne Premium Coals

Cited by 92 publications

References 4 publications

Textural properties in density-separated coal fractions

Textural properties in density-separated coal fractions

Sorption of phenanthrene and benzene on differently structural kerogen: Important role of micropore-filling

Role of pH on CO2 sequestration in coal seams

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