An Inter-laboratory Comparison of CO<sub>2</sub> Isotherms Measured on Argonne Premium Coal Samples

Goodman, Angela; Busch, Andreas; Duffy, G.J.; Fitzgerald, J Edward; Gasem, Khaled A. M.; Gensterblum, Yves; Krooß, Bernhard M.; Levy, John H.; Ozdemir, Ekrem; Pan, Zhejun; Robinson, Robert L.; Schroeder, Karl; Sudibandriyo, Mahmud; White, Curt M.

doi:10.1021/ef034104h

Cited by 160 publications

(123 citation statements)

References 17 publications

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“…As little as 1.4% moisture reduced the methane capacity for a sample from the Pocahontas seam by 26.5% 24 . As little as 0.1%, increase (0.54 % to 0.63%) decreased CO 2 capacity 14% 23 . This implies that CO 2 is more sensitive (at this rank) to moisture content than CH 4 .…”

Section: Role Of Moisturementioning

confidence: 89%

Use of molecular modeling to determine the interaction and competition of gases within coal for carbon dioxide sequestration

Evanseck¹,

Madura²,

Mathews³

2006

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Molecular modeling was employed to both visualize and probe our understanding of carbon dioxide sequestration within a bituminous coal. A large-scale (>20,000 atoms) 3D molecular representation of Pocahontas No. 3 coal was generated. This model was constructed based on a the review data of Stock and Muntean 1 , oxidation and decarboxylation data for aromatic clustersize frequency of Stock and Obeng 2 , and the combination of Laser Desorption Mass Spectrometry data with HRTEM 3 , enabled the inclusion of a molecular weight distribution. The model contains 21,931 atoms, with a molecular mass of 174,873 amu, and an average molecular weight of 714 amu, with 201 structural components. The structure was evaluated based on several characteristics to ensure a reasonable constitution (chemical and physical representation). The helium density of Pocahontas No. 3 coal is 1.34 g/cm 3 (dmmf) 4 and the model was 1.27 g/cm 3 . The structure is microporous, with a pore volume comprising 34% of the volume as expected for a coal of this rank. The representation was used to visualize CO 2 , and CH 4 capacity, and the role of moisture in swelling and CO 2 , and CH 4 capacity reduction. Inclusion of 0.68% moisture by mass (ash-free) enabled the model to swell by 1.2% (volume). Inclusion of CO 2 enabled volumetric swelling of 4%.

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Section: Role Of Moisturementioning

confidence: 89%

Use of molecular modeling to determine the interaction and competition of gases within coal for carbon dioxide sequestration

Evanseck¹,

Madura²,

Mathews³

2006

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“…The CT scans revealed no significant differences between the two cores. The core used in the manometric experiment was then powdered and its sorption of CO 2 was measured at 30 o C by means of a conventional manometric technique and literature values for the CO 2 density 5 . Figure 1 presents a schematic of the experimental setup for the CT experiments.…”

Section: Methodsmentioning

confidence: 99%

“…Most of the sorption studies on coal have been done on coal powders 5,6 . These studies provide a relatively fast way of estimating the storage capacity of coal.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Transport and Sorption Behavior in Confined Coal Cores for Enhanced Coalbed Methane and CO2 Sequestration

et al. 2007

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Measurements of sorption isotherms and transport properties of CO 2 in coal cores are important for designing enhanced coalbed methane/CO 2 sequestration field projects. Sorption isotherms measured in the lab can provide the upper limit on the amount of CO 2 that might be sorbed in these projects.Because sequestration sites will most likely be in unmineable coals, many of the coals will be deep and under considerable lithostatic and hydrostatic pressures. These lithostatic pressures may significantly reduce the sorption capacities and/or transport rates. Consequently, we have studied apparent sorption and diffusion in a coal core under confining pressure. A core from the important bituminous coal Pittsburgh #8 was kept under a constant, three-dimensional external stress; the sample was scanned by X-ray computer tomography (CT) before, then while it sorbed, CO 2 . Increases in sample density due to sorption were calculated from the CT images. Moreover, density distributions for small volume elements inside the core were calculated and analyzed. Qualitatively, the computerized tomography showed that gas sorption advanced at different rates in different regions of the core, and that diffusion and sorption progressed slowly. The amounts of CO 2 sorbed were plotted vs. position (at fixed times) and vs. time (for various locations in the sample). The resulting sorption isotherms were compared to isotherms obtained from powdered coal from the same Pittsburgh #8 extended sample.The results showed that for this single coal at specified times, the apparent sorption isotherms were dependent on position of the volume element in the core and the distance from the CO 2 source. Also, the calculated isotherms showed that less CO 2 was sorbed than by a powdered (and unconfined) sample of the coal. Changes in density distributions during the experiment were also observed. After desorption, the density distribution of calculated volume elements differed from the initial distribution, suggesting hysteresis and a possible rearrangement of coal structure due to CO 2 sorption.

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“…8. Coal desorption isotherm results with CO 2 and CH 4 Unauthenticated Download Date | 5/10/18 1:13 PM Goodman et al, 2004;Medek et al, 2006;He et al, 2010), but also with water (McCutcheon & Barton, 1998;McCutcheon et al, 2002;Charrière & Behra, 2010). The hysteresis effect indicates that the sorbent/ sorbate system is in a metastable state and at decreasing pressure the gas is not readily released to the extent corresponding to the thermodynamic equilibrium value (Busch et al, 2003).…”

Section: Coal Desorption Isothermsmentioning

confidence: 99%

Influence of Coal Particle Size on Coal Adsorption and Desorption Characteristics

Zhang¹,

Aziz²,

Ren³

et al. 2014

Archives of Mining Sciences

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Accurate testing coal isotherm can play a significant role in the areas of coal seam gas drainage, outburst control, CO 2 geo-sequestration, coalbed methane (CBM) and enhanced coalbed methane recovery (ECBM) etc. The effect of particle size on the CO 2 and CH 4 sorption capacity of bituminous coal from Illawarra, Australia was investigated at 35°C and at pressure up to 4 MPa. A unique indirect gravimetric apparatus was used to measure the gas adsorption and desorption isotherms of coal of different particle sizes ranging from around 150 μm to 16 mm. Langmuir model was used to analysis the experimental results of all gases. Coal particle size was found to have an apparent effect on the coal ash content and helium density results. Coal with larger particle size had higher ash content and higher helium density. The sorption isotherm was found to be highly sensitive with helium density of coal which was determined in the procedure of testing the void volume of sample cell. Hence, coal particle size had a significant influence on the coal sorption characteristics including sorption capacity and desorption hysteresis for CO 2 and CH 4 , especially calculated with dry basis of coal. In this study, the 150-212 μm (150 μm) coal samples achieved higher sorption capacity and followed by 2.36-3.35 mm (2.4 mm), 8-9.5 mm (8 mm) and 16-19 mm (16 mm) particle size samples. However, the differences between different coal particles were getting smaller when the sorption isotherms are calculated with dry ash free basis. Test with 150 μm coal samples were also found to have relatively smaller desorption hysteresis compared with the other larger particle size samples. The different results including adsorption/desorption isotherm, Langmuir parameters and coal hysteresis were all analysed with the CO 2 and CH 4 gases.Keywords: coal adsorption, desorption, coal particle size, isotherm, Langmuir volume Dokładne zbadanie izoterm sorpcji na węglu odgrywa kluczową rolę w takich dziedzinach jak odgazowanie pokładów węgla, zapobieganie wybuchom, sekwestracja geologiczna CO 2 , odzysk metanu ze złoża. Wpływ wielkości ziaren na pojemność sorpcyjną bitumicznego węgla z Illawara (Australia) względem CO 2 i CH 4 zbadano w temperaturze 35°C przy ciśnieniu do 4 MPa. Wykorzystano oryginalną aparaturę do badań grawimetrycznych do zmierzenia izoterm adsorpcji i desorpcji na węglu w którym rozmiar ziaren wahał się od 150 μm do 16 mm. Analizę wyników doświadczalnych dla wszystkich gazów przeprowadzono w oparciu o model Langmuira. Stwierdzono, że rozmiary ziaren węglowych w znacznym stopniu warunkują zawartość popiołu i gęstość helową. Węgiel grubiej uziarniony charakteryzował się wyższą zawartością popiołu i większą gęstością helową. Wykazano, że izoterma sorpcji wykazuje wysoką wrażliwość na zmiany gęstości helowej, co stwierdzono na podstawie badania martwej przestrzeni ampułki w której umieszczono próbkę. Wnioskować stąd można, że rozmiar ziaren węgla w dużym stopniu wpływa na charakterystyki sorpcyjne węgla, w tym także na chłonność sorpcyjną i hi...

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An Inter-laboratory Comparison of CO₂ Isotherms Measured on Argonne Premium Coal Samples

Cited by 160 publications

References 17 publications

Use of molecular modeling to determine the interaction and competition of gases within coal for carbon dioxide sequestration

Use of molecular modeling to determine the interaction and competition of gases within coal for carbon dioxide sequestration

Carbon Dioxide Transport and Sorption Behavior in Confined Coal Cores for Enhanced Coalbed Methane and CO2 Sequestration

Influence of Coal Particle Size on Coal Adsorption and Desorption Characteristics

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An Inter-laboratory Comparison of CO2 Isotherms Measured on Argonne Premium Coal Samples

Cited by 160 publications

References 17 publications

Use of molecular modeling to determine the interaction and competition of gases within coal for carbon dioxide sequestration

Use of molecular modeling to determine the interaction and competition of gases within coal for carbon dioxide sequestration

Carbon Dioxide Transport and Sorption Behavior in Confined Coal Cores for Enhanced Coalbed Methane and CO2 Sequestration

Influence of Coal Particle Size on Coal Adsorption and Desorption Characteristics

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An Inter-laboratory Comparison of CO₂ Isotherms Measured on Argonne Premium Coal Samples