Determining Surface Areas from Linear Adsorption Isotherms at Supercritical Conditions

Aranovich, G. L.; Donohue, Marc D.

doi:10.1006/jcis.1997.5099

Cited by 39 publications

(24 citation statements)

References 39 publications

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“…The necessary variable that remains unknown is the volume of the adsorption layer and numerous methods have been suggested to estimate it. Typical methods include fixing the volume of adsorption as the total pore volume of the sorbent material, 1 using a volume proportional to the surface area (assuming fixed thickness), 20 or deriving the volume by assuming the adsorbed layer is at liquid density. 21 Some approaches are specific to graphite-like carbon materials, such as the Ono-Kondo model.…”

Section: Thermodynamic Analysis Of Adsorption Isotherm Datamentioning

confidence: 99%

Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

et al. 2013

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A thermodynamic study of the enthalpy of adsorption of methane on high surface area carbonaceous materials was carried out from 238 to 526 K. The absolute quantity of adsorbed methane as a function of equilibrium pressure was determined by fitting isotherms to a generalized Langmuir-type equation. Adsorption of methane on zeolite-templated carbon, an extremely high surface area material with a periodic arrangement of narrow micropores, shows an increase in isosteric enthalpy with methane occupancy; i.e., binding energies are greater as adsorption quantity increases. The heat of adsorption rises from 14 to 15 kJ/mol at near-ambient temperature and then falls to lower values at very high loading (above a relative site occupancy of 0.7), indicating that methane/ methane interactions within the adsorption layer become significant. The effect seems to be enhanced by a narrow pore-size distribution centered at 1.2 nm, approximately the width of two monolayers of methane, and reversible methane delivery increases by up to 20% over MSC-30 at temperatures and pressures near ambient.

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Section: Thermodynamic Analysis Of Adsorption Isotherm Datamentioning

confidence: 99%

Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

et al. 2013

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“…Similar approaches based on high-pressure adsorption data have been used pre-Ž . viously to estimate adsorbed phase properties Menon, 1968 Ž as well as adsorbent surface area Aranovich and Donohue, . 1997a .…”

Section: Total Adsorption From Gibbsian Excessmentioning

confidence: 99%

High‐resolution adsorption isotherms of supercritical carbon dioxide on activated carbon

2000

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“…This phenomenon is the basis of a method to determine the specific surface area of the adsorbent, independent of the space requirements of the adsorbate molecule [16]. This method is also applicable to zeolites such as Na-Y [17].…”

Section: Adsorptionmentioning

confidence: 99%

“…In single-component adsorption at supercritical conditions, the adsorbed phase approaches a constant volume and a constant density with increasing pressures [16,17]. This phenomenon is the basis of a method to determine the specific surface area of the adsorbent, independent of the space requirements of the adsorbate molecule [16].…”

Section: Adsorptionmentioning

confidence: 99%

Novel Process Options for Application of Zeolites in Supercritical Fluids and Ionic Liquids

Gläser¹

2007

Chem Eng & Technol

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Supercritical fluids and ionic liquids offer attractive opportunities for modifying and applying zeolites as adsorbents and catalysts. After a brief introduction to the most important properties of these solvents, examples of zeolite applications in supercritical fluids and ionic liquids from the recent literature are discussed. Particular emphasis is put on the influence of reaction media on the processes occurring in the zeolitic pore systems, e.g., during shape-selective conversions in zeolite catalysts. The present potential and future challenges for the application of zeolites in supercritical fluids and ionic liquids are identified. Most attractive process options arise from a combined use of both ionic liquids and supercritical fluids in integrated reaction schemes.

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Determining Surface Areas from Linear Adsorption Isotherms at Supercritical Conditions

Cited by 39 publications

References 39 publications

Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

High‐resolution adsorption isotherms of supercritical carbon dioxide on activated carbon

Novel Process Options for Application of Zeolites in Supercritical Fluids and Ionic Liquids

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