Adsorption methods to study microporosity in coals and carbons—a critique

Marsh, H.

doi:10.1016/0008-6223(87)90039-x

Cited by 234 publications

(118 citation statements)

References 29 publications

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“…In this sense, adsorption of CO2 carried out under low relative pressures (<0.03), and at higher temperatures, 0°C, can give us valuable information about this type of microporosity (Linares-Solano, 1986;Marsh, 1987;Rodríguez-Reinoso and Linares-Solano, 1988). Significant differences are found in CO2 adsorption isotherms at 0°C (Figure 2B).…”

Section: Materials Characterizationmentioning

confidence: 99%

“…On the other hand, activated carbon materials are usually adversely compared in terms of CO2 adsorption capacity and/or selectivity. Nevertheless, it has been proven that adsorption capacity and selectivity toward CO2 are strongly dependent on the porous structure and chemical surface of the adsorbent (Ruthven, 1984;Marsh and Rodríguez-Reinoso, 2006;Shafeeyan et al, 2010;Gargiulo et al, 2014). Specifically, it has been reported that at low CO2 partial pressures and room temperature, CO2 adsorption capacity is intrinsically related to micropores, although some discrepancies can be found in the literature.…”

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confidence: 99%

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Biomass Waste Carbon Materials as adsorbents for CO2 Capture under Post-Combustion Conditions

et al. 2016

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A series of porous carbon materials obtained from biomass waste have been synthesized, with different morphologies and structural properties, and evaluated as potential adsorbents for CO2 capture in post-combustion conditions. These carbon materials present CO2 adsorption capacities, at 25°C and 101.3 kPa, comparable to those obtained by other complex carbon or inorganic materials. Furthermore, CO2 uptakes under these conditions can be well correlated with the narrow micropore volume, derived from the CO2 adsorption data at 0°C ( ) V CO 2 DR . In contrast, CO2 adsorption capacities at 25°C and 15 kPa are more related to only pores of sizes lower than 0.7 nm. The capacity values obtained in column adsorption experiments were really promising. An activated carbon fiber obtained from Alcell lignin, FCL, presented a capacity value of 1.3 mmol/g (5.7%wt). Moreover, the adsorption capacity of this carbon fiber was totally recovered in a very fast desorption cycle at the same operation temperature and total pressure and, therefore, without any additional energy requirement. Thus, these results suggest that the biomass waste used in this work could be successfully valorized as efficient CO2 adsorbent, under post-combustion conditions, showing excellent regeneration performance.

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Section: Materials Characterizationmentioning

confidence: 99%

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confidence: 99%

Biomass Waste Carbon Materials as adsorbents for CO2 Capture under Post-Combustion Conditions

et al. 2016

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“…The micropore size distribution was determined from the CO2 isotherms by a non-local density functional theory (NLDFT) equilibrium model assuming slit pores (Ravikovitch et al, 1998). The Sorption Pore Volume was calculated from 195 K CO2 isotherms according to the Gurvitsch rule (Gurvitsch, 1915;Marsh, 1987;Fletcher et al, 2005) and assuming density of CO2 of 1.177 g/cm³. For detailed description of these methods on shale see Rexer et al (2013Rexer et al ( , 2014.…”

Section: Pore Characterizationmentioning

confidence: 99%

First international inter-laboratory comparison of high-pressure CH 4 , CO 2 and C 2 H 6 sorption isotherms on carbonaceous shales

Gašparík

Rexer

Aplin

et al. 2014

International Journal of Coal Geology

137

108

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractAn inter-laboratory study of high-pressure gas sorption measurements on two carbonaceous shales has been conducted in order to assess the reproducibility of the sorption isotherms and identify possible sources of error. The measurements were carried out by seven international research laboratories on either in-house or commercial sorption equipment using manometric as well as gravimetric methods. Excess sorption isotherms for methane, carbon dioxide and ethane were measured at 65°C and at pressures up to 25 MPa on two organic-rich shales in the dry state. The samples were taken from the immature Posidonia shale (Germany) and from the over-mature Upper Chokier formation (Belgium). Their total organic carbon (TOC) and vitrinite reflectance (VRr) values were 15.1% and 4.4% and 0.5% and 2.0%, respectively. The objective of the study was to assess the inter-laboratory reproducibility of sorption isotherms as would be expected with each laboratory following its own measurement and data reduction procedures. All labs were asked to follow a predefined sample drying procedure prior to measurement in order to minimize any effects related to moisture. The reproducibility of the methane excess sorption isotherms was better for the high-maturity shale (within 0.02 -0.03 mmol/g) than for the low-maturity sample (up to 0.1 mmol/g), similar to observations in earlier inter-laboratory studies on coals. The reproducibility for CO2 and C2H6 sorption isotherms was satisfactory at pressures below 5 MPa, however,the results deviate considerably at higher pressures. Artefacts in the shape of the excess sorption isotherms were observed for CO2 and C2H6 and these are explained as being due to a high sensitivity of gas density to temperature and pressure close to the critical point as well as from a limited measurement accuracy and possibly uncertainty in the equation of state (EoS).The low sorption capacity of carbonaceous shales (as compared to coals and activated carbons) sets very high demands on the accuracy of pressure and temperature measurement and precise temperature control. Furthermore, the sample treatment, measurement and data reduction procedures must be optimized in order to achieve satisfactory inter-laboratory consistency and accuracy. Unknown systematic errors must be minimized first by calibrating the pressure and temperature measurement sensors to high-quality standards. Blank sorption measurements with a non-sorbing sample (e.g. steel cylinders) can be used to identify and...

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“…A significant proportion of the total open pore volume is located in micropores (Sharkey and McCartney, 1981) and thus the potentially available sites for adsorption. The surface area of the coal on which the methane is adsorbed is very large (20-200 m 2 /g) and, if saturated, coalbed methane reservoirs can have five times the volume of gas contained in a conventional gas reservoir of comparable size (Marsh, 1987).…”

Section: Storage Mechanism and Capacitymentioning

confidence: 99%

CO₂Storage in Deep Unminable Coal Seams

Shi

Durucan

2005

Oil & Gas Science and Technology - Rev. IFP

115

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Résumé -Stockage du CO 2 dans des veines de charbon non exploitables -Le mécanisme de stockage du CO 2 dans les veines de charbon (coalbeds), l'adsorption, est très différent de ceux intervenant dans les réservoirs d'hydrocarbures ou dans les aquifères, où le CO 2 occupe les pores en tant que phase distincte ou bien est dissous dans l'eau ou l'huile. Durant les 20 dernières années, le méthane issu des veines de charbon (coalbed methane ou CBM) est devenu une source importante (non conventionelle) de gaz naturel aux États-Unis. L'injection de CO 2 pour augmenter la récupération de CBM (CO 2 -ECBM) est une technologie émergente qui pourrait permettre de stocker des volumes importants de CO 2 anthropique dans les veines de charbon, tout en augmentant l'efficacité de la production de méthane. Abstract -CO 2 Storage in Deep Unminable Coal Seams -The gas storage mechanism in coal seams

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Adsorption methods to study microporosity in coals and carbons—a critique

Cited by 234 publications

References 29 publications

Biomass Waste Carbon Materials as adsorbents for CO2 Capture under Post-Combustion Conditions

Biomass Waste Carbon Materials as adsorbents for CO2 Capture under Post-Combustion Conditions

First international inter-laboratory comparison of high-pressure CH 4 , CO 2 and C 2 H 6 sorption isotherms on carbonaceous shales

CO₂Storage in Deep Unminable Coal Seams

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Adsorption methods to study microporosity in coals and carbons—a critique

Cited by 234 publications

References 29 publications

Biomass Waste Carbon Materials as adsorbents for CO2 Capture under Post-Combustion Conditions

Biomass Waste Carbon Materials as adsorbents for CO2 Capture under Post-Combustion Conditions

First international inter-laboratory comparison of high-pressure CH 4 , CO 2 and C 2 H 6 sorption isotherms on carbonaceous shales

CO2Storage in Deep Unminable Coal Seams

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CO₂Storage in Deep Unminable Coal Seams