Net, excess and absolute adsorption in mixed gas adsorption

Brandani, Stefano; Mangano, Enzo; Luberti, Mauro

doi:10.1007/s10450-017-9875-4

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…From Equation (14) it is possible to define also the reference state for the solid as that of the solid phase without adsorbates at the same pressure of the system [ 20 ] as in this limit

;

and

, therefore

…”

Section: Ralf Model For a Frozen Adsorbentmentioning

confidence: 99%

“…These last two expressions lead to the reduced grand potential [ 20 ]

which is a fundamental quantity [ 11 ] in the thermodynamics of the adsorbed phase as it allows to define the reference state relative to which activity coefficients can be obtained. One should note that Equation (15) is only a function of composition and the total adsorbed amount and does not depend explicitly on the system pressure.…”

Section: Ralf Model For a Frozen Adsorbentmentioning

confidence: 99%

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The Rigid Adsorbent Lattice Fluid Model: Thermodynamic Consistency and Relationship to the Real Adsorbed Solution Theory

Brandani

2022

Membranes

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The Rigid Adsorbent Lattice Fluid model has been shown to comply with all the requirements for thermodynamic consistency in the case of an adsorbent that does not undergo structural changes. This is achieved by introducing a correction to the reduced density function that multiplies the combinatorial term. A procedure to calculate the predicted adsorbed mixture activity coefficients has been presented that allows the production of excess Gibbs energy plots at a constant reduced grand potential. The predicted nonideality is structurally consistent with the Non-Ideal Adsorbed Solution Theory of Myers in terms of both its dependence on concentration and reduced grand potential. The ability to generate excess Gibbs energy values allows linking the new Rigid Adsorbent Lattice Fluid model to the traditional Real Adsorbed Solution Theory providing an alternative approach to predicting multicomponent adsorption based solely on pure component data.

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“…From Equation (14) it is possible to define also the reference state for the solid as that of the solid phase without adsorbates at the same pressure of the system [ 20 ] as in this limit

;

and

, therefore

…”

Section: Ralf Model For a Frozen Adsorbentmentioning

confidence: 99%

“…These last two expressions lead to the reduced grand potential [ 20 ]

Section: Ralf Model For a Frozen Adsorbentmentioning

confidence: 99%

The Rigid Adsorbent Lattice Fluid Model: Thermodynamic Consistency and Relationship to the Real Adsorbed Solution Theory

Brandani

2022

Membranes

View full text Add to dashboard Cite

show abstract

“…All that remains to be decided is the basis for the definition of the chemical potentials. The natural variables in the thermodynamics of adsorption are the absolute adsorbed amounts defined as the number of moles per unit mass of adsorbent, n i , or per unit volume of adsorbent that includes the micropores, q i . Here, consistency is maintained with the notation used by Myers and Monson, mass of solid basis, and Ruthven, volume of solid basis.…”

Section: Ralf Model For the Frozen Solidmentioning

confidence: 99%

The rigid adsorbent lattice fluid model for pure and mixed gas adsorption

Brandani

2019

AIChE Journal

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The ability of macroscopic models to predict correctly multicomponent systems from pure component isotherms alone remains a major challenge in adsorption engineering. A new fundamental thermodynamic model for multicomponent adsorption of molecules of different size in nanoporous materials is derived from a modified lattice fluid model. Expressions for the fugacity coefficients are derived and the resulting equilibrium relationships are shown to be consistent with a type I adsorption isotherm. Expressions are obtained for the saturation capacity, the Henry law constant and the adsorption energy. The model is applied to silicalite and the parameters for the adsorbent are obtained from crystal properties, the adsorption energy of n‐alkanes and Henry law constants for six gases. Model predictions for gas adsorption up to 20 bar are shown to be comparable to empirical adsorption isotherm equations. Extension to binary and quaternary systems shows good a priori predictive capability when compared to experimental data. © 2018 American Institute of Chemical Engineers AIChE J, 65: 1304–1314, 2019

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Analytical model and experimental investigation of the adsorption thermodynamics of coalbed methane

Kang

et al. 2019

Adsorption

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Net, excess and absolute adsorption in mixed gas adsorption

Cited by 7 publications

References 16 publications

The Rigid Adsorbent Lattice Fluid Model: Thermodynamic Consistency and Relationship to the Real Adsorbed Solution Theory

The Rigid Adsorbent Lattice Fluid Model: Thermodynamic Consistency and Relationship to the Real Adsorbed Solution Theory

The rigid adsorbent lattice fluid model for pure and mixed gas adsorption

Analytical model and experimental investigation of the adsorption thermodynamics of coalbed methane

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