Isosteric heat of adsorption from thermodynamic Langmuir isotherm

Tun, Hla; Chen, Chau‐Chyun

doi:10.1007/s10450-020-00296-3

Cited by 56 publications

(31 citation statements)

References 27 publications

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“…Equation (23) shows, while A o remains constant, the occupied area for adsorbate component i, n i A i , and the area for vacant sites, n ϕ A ϕ , vary with loading and adsorbate phase composition.…”

Section: Gl Isotherm For Mixed-gas Adsorptionmentioning

confidence: 99%

Generalization of thermodynamic Langmuir isotherm for mixed‐gas adsorption equilibria

et al. 2022

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This work presents a comprehensive thermodynamic model for both pure component isotherms and mixed‐gas adsorption equilibria. A generalization of thermodynamic Langmuir isotherm, the proposed model assumes competitive adsorption of multiple adsorbates on adsorbent surface for mixed‐gas adsorption equilibria, and it applies an area‐based adsorption nonrandom two‐liquid activity coefficient model in the activity coefficient calculations for the adsorbate phase. The resulting generalized Langmuir isotherm properly captures both surface loading dependence and adsorbate phase composition dependence for mixed‐gas adsorption equilibria. The model is validated with accurate representations of gas adsorption equilibrium data for varieties of unary, binary, and ternary gas systems. The model results are further compared with those calculated from extended Langmuir isotherm and Ideal Adsorbed Solution Theory.

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Section: Gl Isotherm For Mixed-gas Adsorptionmentioning

confidence: 99%

Generalization of thermodynamic Langmuir isotherm for mixed‐gas adsorption equilibria

et al. 2022

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“…The isosteric heat is the difference in enthalpy derived using the adsorption isotherm at a minimum of two temperatures [6,18]. Under constant temperature and pressure, a discrete volume of gas transitions itself from the large gaseous state to its adsorbed phase, with the heat dispersed to the surrounding environment.…”

Section: Methodsmentioning

confidence: 99%

“…Researchers from several fields of study are now investigating adsorbent materials to improve the performance of adsorption chillers. Understanding the isosteric heat of adsorption provides for a better calculation of the vapour uptake duration by determining the capacity of the integrated material to swiftly disperse the heat generated in the framework [6,19].…”

Section: The Clausius-clapeyron Formulamentioning

confidence: 99%

“…This extensive overview of the numerous ways for determining the isotherm graph procedure using methods such as Freundlich-Langmuir, isotherm enthalpy, and intensity may be useful for researchers transitioning to adsorption porous studies [5,6]. According to the current review, the Langmuir adsorption model is the most widely utilized.…”

Section: Introductionmentioning

confidence: 99%

“…In conclusion, this isotherm combination is a practical and useful model for studying adsorption equilibrium. For the reasons stated above, this article uses the Clausius-Clapeyron relationship and Freundlich-Langmuir theory to simulate the isosteric adsorption of the used adsorbents [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Adsorptive Process on Adsorbent Surfaces as a Function of Pressure in an Isosteric System Compared with Adsorption Isotherm

2022

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The developing significance of adsorption has brought about a steadily expanding quantity of logical and innovative writing on different adsorbents. This paper intends to propose experimental and computational methods for measuring the strength of adsorbate–solid interactions. It primarily focuses on the use of graphs to measure the effectiveness of an adsorbate’s bonds with the solid adsorbent by determining the isosteric heat. The Clausius–Clapeyron model equation is used to determine the isosteric enthalpy of adsorption from two adsorption isotherms at various but close temperatures, with ΔT of 10 °C. A full computational explanation of the Clausius–Clapeyron model equation for determining ΔHads is provided using experimental data. Logarithmic plots of uptakes vs. p in the low-pressure zone for the Freundlich–Langmuir graph are used to assess and confirm the quality of the crucial underlying isotherms. The isosteric heat was found to be between 13.5 kJ/mol and 16 kJ/mol.

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From Langmuir isotherm to Brunauer–Emmett–Teller isotherm

et al. 2021

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Developed for multilayer adsorption, the Brunauer-Emmett-Teller (BET) isotherm considers the adsorption of the first layer as an equilibrium chemical reaction between adsorbate molecules and adsorption sites and the adsorption of the second and subsequent layers as a condensation-evaporation process. Following the recent development of an activity-based formulation for the Langmuir isotherm for monolayer adsorption, we present an activity-based formulation for the BET isotherm in which species concentrations are replaced with species activities. Capturing the adsorbent surface heterogeneity for the adsorption of the first layer, the resulting thermodynamic BET isotherm is shown to accurately represent pure component adsorption isotherms over the relative pressure range of zero to unity or prior to the onset of capillary condensation. The thermodynamic BET isotherm should facilitate accurate estimation of monolayer adsorption capacity and the corresponding adsorbent surface area.

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Isosteric heat of adsorption from thermodynamic Langmuir isotherm

Cited by 56 publications

References 27 publications

Generalization of thermodynamic Langmuir isotherm for mixed‐gas adsorption equilibria

Generalization of thermodynamic Langmuir isotherm for mixed‐gas adsorption equilibria

Evaluation of the Adsorptive Process on Adsorbent Surfaces as a Function of Pressure in an Isosteric System Compared with Adsorption Isotherm

From Langmuir isotherm to Brunauer–Emmett–Teller isotherm

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