Adsorption measurements of argon, neon, krypton, nitrogen, and methane on activated carbon up to 650 MPa

Malbrunot, P.; Vidal, Denis; Vermesse, J.; Chahine, Richard; Bose, T. K.

doi:10.1021/la00038a044

Cited by 100 publications

(89 citation statements)

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“…The excess (or Gibbs) absorption was used to interpret the observations made, because at high pressures, where the density of the supercritical fluid approaches the density of the adsorbed phase, it is more appropriate than the absolute adsorption [11,12].…”

Section: Methodsmentioning

confidence: 99%

Volumetric Effects in Coal Sorption Capacity Measurements

Romanov

Soong

Schroeder

2006

Chem. Eng. Technol.

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Section: Methodsmentioning

confidence: 99%

Volumetric Effects in Coal Sorption Capacity Measurements

Romanov

Soong

Schroeder

2006

Chem. Eng. Technol.

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“…The highest pressure reported is 650 MPa (17). However, this convention was challenged by the conception of "limit adsorption" that was defined initially by the intersection point of linear isotherms (18) isotherm represents, in fact, the absolute adsorption because it corresponds to the condition of very low surface concentration of adsorbates (19).…”

Section: A Comparison Between the Limit Quantities Of Adsorption Diffmentioning

confidence: 99%

Studies on the Transition Behavior of Physical Adsorption from the Sub- to the Supercritical Region: Experiments on Silica Gel

Zhou

Bai

et al. 2002

Journal of Colloid and Interface Science

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“…The amount adsorbed decreases with increasing pressure after the maximum. Actually, the maximum will appear even for high temperatures so long as the pressure is high enough [8] . B nard and Chahine [10] measured the adsorption of methane on CNS-201 carbon over the same range of temperature, but no maximum was observed.…”

Section: Adsorption/desorption Isothermsmentioning

confidence: 99%

Measurement and theoretical analysis of the adsorption of supercritical methane on superactivated carbon

Zhou

2000

Sc. China Ser. B-Chem.

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Adsorption/desorption isotherms of supercritical methane on superactivated carbon have been measured in the range of 0 10 MPa and 233 333 K (20 K interval). The reversibility of the physical adsorption process is acknowledged. The heat of adsorption of 16.5 kJ/mol is determined from the isotherms, and a new modeling strategy for isotherms with maximum is presented. The model yields fits to the experimental isotherms with precision of 2%, maintaining the constancy of the characteristic energy of adsorption. The exponent of the model equation expresses the pore size distribution feature of the adsorbent. The density of the supercritical adsorbate is evaluated as a parameter of the model. It is shown that the conventional isotherm theory works too at supercritical condition if the limit state of supercritical adsorption is introduced into isotherm modeling.Engineering prospects encouraged studies on the adsorption of supercritical methane on superactivated carbons. One of the impacts of the environment protection law is the development of alternative fuels for vehicles. Natural gas has been an appropriate choice. The on-board storage of natural gas becomes a key technique for such an application. Adsorptive storage of natural gas at ambient temperature and mild pressures shows attractive cost merits in comparison to liquefaction or compressive storage. The superactivated carbon was recognized as the best adsorbent in respects of adsorption capacity and cost. As the major component of natural gas, methane adsorption behavior on the adsorbent will answer questions as to how much gas could be stored on unit mass of carbon or unit volume of tank; how significant is the thermal effect of the adsorption, whether the adsorption process is reversible; etc. The answers to these questions are of the first concern for engineering purposes.The study of methane adsorption on superactivated carbon will contribute to the development Nomenclature E, characteristic energy of adsorption, J mol 1 ; H 0 , enthaply difference between adsorbate phase and ambient gas, kJ mol -1 ; K , the Henry's law constant; n, the measured or excess amount adsorbed, mmol g -1 ; n t , absolute adsorption, mmol/g; n 0 , saturated amount of adsorption, mmol g -1 ; n lim , the limiting amount of supercritical adsorption; P, the equilibrium pressure, MPa; P s , saturated pressure, Mpa; P lim , the limiting pressure of supercritical adsorption, MPa; q, exponent of the Dubinin-Astakhov equation; R, gas constant; T, the equilibrium temperature, K; v a , adsorbate volume, mL g -1 ; U g , density of gas phase, mmol mL 1 ; U a , density of adsorbate phase, mmol mL 1 .

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Adsorption measurements of argon, neon, krypton, nitrogen, and methane on activated carbon up to 650 MPa

Cited by 100 publications

References 0 publications

Volumetric Effects in Coal Sorption Capacity Measurements

Volumetric Effects in Coal Sorption Capacity Measurements

Studies on the Transition Behavior of Physical Adsorption from the Sub- to the Supercritical Region: Experiments on Silica Gel

Measurement and theoretical analysis of the adsorption of supercritical methane on superactivated carbon

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