Characterization of the CO2 fluid adsorption in coal as a function of pressure using neutron scattering techniques (SANS and USANS)

Melnichenko, Yuri B.; Radlinski, A.P.; Mastalerz, María; Cheng, Gang; Rupp, John A.

doi:10.1016/j.coal.2008.09.017

Cited by 102 publications

(81 citation statements)

References 41 publications

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“…QENS and SANS were used in [53] to study the diffusion of methane in nanoporous carbon aerogel with a pore size distribution similar to that of coal studied in [54]. Carbon aerogel samples were obtained from Oscellus Technologies, Livermore, CA.…”

Section: Methane In Porous Carbonsmentioning

confidence: 99%

“…Because the understanding of the process of CO 2 adsorption into the coal beds is necessary to ensure successful CO 2 injection operations on an industrial scale, the details of this process that remain unknown need to be resolved. SANS and USANS techniques were applied in [68] to study CO 2 adsorption process in-situ in coals under simulated hydrostatic reservoir conditions. Three coal seams were sampled to represent a range of the hydrostatic reservoir conditions (pressure, P, and temperature, T ) and the corresponding CO 2 phase properties: the Seelyville from the Illinois Basin (USA), Bulli 4 from the Sydney Basin (Australia), and Baralaba from the Bowen Basin (Australia).…”

Section: Co 2 Sequestration In Coalmentioning

confidence: 99%

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Supercritical Fluids in Confined Geometries

Melnichenko

2016

Small-Angle Scattering From Confined and Interfacial Fluids

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Understanding the influence of confinement on the structure and thermodynamic properties of supercritical fluids in pores of different surface chemistry and topology is fundamental to the successful development and optimization of the variety of technologies involving fluid-solid interactions. Adsorption behavior of supercritical fluids (SCFs) is fundamentally different from that of subcritical vapors and this chapter begins with a general description of the specifics of the supercritical adsorption. Presented examples illustrate the capability of SAS methods to deliver unique, pore-size-dependent information on the properties of supercritical CO 2 , hydrogen, methane, and other fluids confined in pores of different engineered and natural porous solids. Applications of SAS for studying pore interconnectivity and structural stability of porous materials under pressure are also discussed.

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Section: Methane In Porous Carbonsmentioning

confidence: 99%

Section: Co 2 Sequestration In Coalmentioning

confidence: 99%

Supercritical Fluids in Confined Geometries

Melnichenko

2016

Small-Angle Scattering From Confined and Interfacial Fluids

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“…Lu et al has reported that the interlayer spacing is strongly affected by heat treatment temperature of 900˚C and above, and this result into a decrease in the interlayer spacing which invariably amounts to a more condensed char structure [34]. The condensed structure of the char is attributed to the removal of aliphatic side chains from the coal matrix and the reduction of hydrogen content which makes room for hydrogen radicals to re-combine forming higher aromatic molecules at higher temperatures [26].…”

Section: Resultsmentioning

confidence: 99%

“…Organic oxygen is an important component of the overall structure and plays a key role in determining reactivity [2] [25]. Hence, a decrease in oxygen content in coal leads to energy content increasing automatically [26].…”

mentioning

confidence: 99%

Spectroscopic Elucidation of the Links between Char Morphology and Chemical Structure of Coals of Different Ranks

Odeh¹

2016

ACES

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“…Studies of coal porosity have been conducted in order to have a better understanding of these gas reservoir parameters, and to predict the suitability of coal for char or activated carbon production (Adeboye and Bustin, 2013;Bahadur et al, 2015;Cai et al, 2013;Crosdale et al, 2008;Melnichenko et al, 2009Melnichenko et al, , 2012Parkash and Chakrabartty, 1986;Radlinski, 2006;Rodrigues and Lemos de Sousa, 2002). In coal, porosity exists as a system of pores (micro-, meso-and macropores) and cleats or fractures (Flores, 2014), which can be occupied by a liquid or a gas (Levine, 1993;Rodrigues and Lemos de Sousa, 2002).…”

Section: Introductionmentioning

confidence: 99%

Pore structure changes from wood to vitrain: a casy study from New Zealand coal

Rahmat¹

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Porosity in coal plays an important role in determining sorption capacity and diffusion behaviour of a given gas. Total porosity and pore size distribution are known to change with rank and composition. Total porosity declines whereas micropore volume increases with rank. On the other hand, the variability in composition among coals makes it difficult to track the changes due to the influence of various plant precursors. This study examines pore structure changes from the original plant structure represented by wood to vitrain across a range of ranks.Samples used in this study include a coal rank suite from brown coal to medium volatile bituminous of Cretaceous age from New Zealand. Porosity evolution during coalification was assessed using vitrain bands isolated from these coals which is derived from the genus Lagarostrobos. Previous palynological studies suggest that the precursor wood is related to the modern Huon pine (Lagarostrobos franklinii). Therefore, a wood sample of this species from Tasmania was also analysed. The methods used in this study were optical microscopy, low pressure gas adsorption using nitrogen and carbon dioxide at 77 K (-196.15 0 C) and 273 K (0 0 C) respectively, high pressure adsorption isotherms using carbon dioxide and methane at 32 0 C, and small/ultra-small angle neutron scattering (SANS/USANS).Petrographic analysis shows that the vitrain suite has a vitrinite content ranging from 79 % to 100 %, telinite in particular, ranging from 13.3% to 84.7% mmf, with random vitrinite reflectance ranging from 0.39 % to 1.49%. Qualitative comparison of wood microstructure and cell diameter in the Huon pine sample and that revealed in the vitrain samples by etching, shows a similar simple cell structure (bordered pits, unicellular rays). Based on an average cell diameter of 20 µm, compaction estimates ranged from 9:1 to 4:1, except for samples that did not appear woody (i.e. they were attrital and derived from herbaceous plants), or were heat affected, and tectonically deformed. This supports the assumption that most vitrain samples in this study have a Huon pine like precursor plant.Results from low pressure adsorption, using nitrogen, shows that the percentage of cumulative pore volume of micropores (those less than 20Å), from wood to vitrain increases with rank. The increase in micropore volume percentage rose significantly and peaked at sub-bituminous rank (Rr= 0.6%); thereafter it decreased exponentially with rank to medium volatile bituminous rank (Rr=0.9%). There is also an inverse correspondence between a ii decrease in percentage of cumulative macropores (pores larger than 500 Å) volume, at subbituminous rank (Rr=0.6%), that increases with increasing rank. Mesopores show a similar trend to micropores with a peak exception at 0.90% Rr. The total cumulative pore volume of micro-, meso-and macropore sizes show a good relationship with telinite maceral content.The result suggests that the changes in pore structure of the vitrain suite of samples, is more affected by vitrain compos...

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Characterization of the CO2 fluid adsorption in coal as a function of pressure using neutron scattering techniques (SANS and USANS)

Cited by 102 publications

References 41 publications

Supercritical Fluids in Confined Geometries

Supercritical Fluids in Confined Geometries

Spectroscopic Elucidation of the Links between Char Morphology and Chemical Structure of Coals of Different Ranks

Pore structure changes from wood to vitrain: a casy study from New Zealand coal

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