Surface excess amounts in high-pressure gas adsorption: Issues and benefits

Rouquérol, J.; Rouquérol, F.; Llewellyn, Phillip; Denoyel, Renaud

doi:10.1016/j.colsurfa.2015.10.045

Cited by 11 publications

(7 citation statements)

References 39 publications

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“…The surface excess is the amount adsorbed that is present more than ρ g V ads (the amount corresponding to the adsorbed phase volume with the gas phase density). Figure shows a schematic diagram of the surface excess amount and local concentration (d n /d V ) versus distance from the Gibbs dividing surface (GDS). , The simplified physical interpretation of GDS is that it is usually located on the surface. However, the surface accessible to an adsorptive is usually ill-defined .…”

Section: Adsorption Methodsmentioning

confidence: 99%

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Perspectives of Gas Adsorption and Storage in Kerogens and Shales

Thomas

2023

Energy Fuels

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Shale gas from unconventional resources will contribute to meeting the energy demand during the transition to a net-zero carbon economy. In this minireview, the current status of understanding methane adsorption on kerogens and shales is discussed in relation to methane storage capacity. Standard subcritical adsorption studies provide characterization data (micropore volumes, total pore volumes, surface areas, and pore size distributions) for the porous structures of shales and kerogens. However, supercritical methane adsorption measurements under simulated geological conditions are necessary to assess realistic methane adsorption storage capacities. Supercritical methane adsorption on shale and shale components (kerogens and clays) under high pressure and temperature conditions that simulated geological conditions is compared. Kerogen structural characteristics are discussed in relation to supercritical methane isotherms and isobars. The contribution of adsorbed methane gas relative to “free” or compressed gas to the total gas stored in shale is considered. The importance of kerogens in both storage of the adsorbed phase and as the source of methane is highlighted, and the areas where knowledge and understanding are deficient are identified, in particular, the relationship of kerogen type and maturity with supercritical methane adsorption under simulated geological conditions. The competitive adsorption of water on methane capacity is also an area where more detailed studies are necessary. These are challenges to address gaps in the current knowledge and understanding, which require future research.

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Section: Adsorption Methodsmentioning

confidence: 99%

“…However, the surface accessible to an adsorptive is usually ill-defined. 25 The surface excess amount is represented by the hatched area in Figure 2. In the case of lowtemperature subcritical adsorption, both the gas phase density and volume of the adsorbed layer are small.…”

Section: Concept Of Gibbs Surface Excessmentioning

confidence: 99%

Perspectives of Gas Adsorption and Storage in Kerogens and Shales

Thomas

2023

Energy Fuels

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“… ( A ) Scheme of the experimental setup for a volumetric measurement, ( B ) Gibbs representation of the adsorbed amount on a solid (adapted from [ 109 ] with permission from Elsevier). …”

Section: Figurementioning

confidence: 99%

Biobased Functional Carbon Materials: Production, Characterization, and Applications—A Review

Correa

Kruse

2018

Materials

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Even though research on porous carbon materials from biomass dates back to at least hundred years, it is still an extremely relevant topic. These materials can be found in applications that range from those that are widely known, such as water treatment, to others that are newer and indispensable for the transition towards environmentally friendly technologies, such as lithium- and sodium-ion batteries. This review summarizes some of the most relevant research that has been published concerning production technologies, insights on the chemical reaction mechanisms, characterization techniques, as well as some examples of the applications and the properties that the carbon materials must fulfil to be used in those applications.

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“…The deviations are minimal for helium Z-factor (within ±0.25%) for all the EOS. Although the corresponding deviations of free space volume are also small (within±0.5%), they can have significant effects on the amounts adsorbed, especially at high pressure [10,37,38].…”

Section: Low-pressure Nitrogen Sorption Isotherms and Pore-size Distrmentioning

confidence: 97%

Volumetric Measurements of Methane-Coal Adsorption and Desorption Isotherms—Effects of Equations of State and Implication for Initial Gas Reserves

Ekundayo

Rezaee

2019

Energies

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This study presents the effects of equations of state (EOSs) on methane adsorption capacity, sorption hysteresis and initial gas reserves of a medium volatile bituminous coal. The sorption experiments were performed, at temperatures of 25 °C and 40 °C and up to 7MPa pressure, using a high-pressure volumetric analyzer (HPVA-II). The measured isotherms were parameterized with the modified (three-parameter) Langmuir model. Gas compressibility factors were calculated using six popular equations of state and the results were compared with those obtained using gas compressibility factors from NIST-Refprop® (which implies McCarty and Arp’s EOS for Z-factor of helium and Setzmann and Wagner’s EOS for that of methane). Significant variations were observed in the resulting isotherms and associated model parameters with EOS. Negligible hysteresis was observed with NIST-refprop at both experimental temperatures, with the desorption isotherm being slightly lower than the adsorption isotherm at 25 °C. Compared to NIST-refprop, it was observed that equations of state that gave lower values of Z-factor for methane resulted in “positive hysteresis”, (one in which the desorption isotherm is above the corresponding adsorption curve) and the more negatively deviated the Z-factors are, the bigger the observed hysteresis loop. Conversely, equations of state that gave positively deviated Z-factors of methane relatively produced “negative hysteresis” loops where the desorption isotherms are lower than the corresponding adsorption isotherms. Adsorbed gas accounted for over 90% of the calculated original gas in place (OGIP) and the larger the Langmuir volume, the larger the proportion of OGIP that was adsorbed.

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Surface excess amounts in high-pressure gas adsorption: Issues and benefits

Cited by 11 publications

References 39 publications

Perspectives of Gas Adsorption and Storage in Kerogens and Shales

Perspectives of Gas Adsorption and Storage in Kerogens and Shales

Biobased Functional Carbon Materials: Production, Characterization, and Applications—A Review

Volumetric Measurements of Methane-Coal Adsorption and Desorption Isotherms—Effects of Equations of State and Implication for Initial Gas Reserves

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