An activity-based formulation for Langmuir adsorption isotherm

Chang, Chun-Kai; Tun, Hla; Chen, Chau-Chyun

doi:10.1007/s10450-019-00185-4

An activity-based formulation for Langmuir adsorption isotherm

Journal Article · Wed Nov 27 00:00:00 EST 2019 · Adsorption

DOI:https://doi.org/10.1007/s10450-019-00185-4· OSTI ID:1642080

Chang, Chun-Kai ^[1]; Tun, Hla ^[2]; ^[2]

National Taiwan University, Taipei (Taiwan); Texas Tech University
Texas Tech Univ., Lubbock, TX (United States)

This work presents an activity-based formulation for Langmuir adsorption isotherm. Treating adsorption as a chemical reaction between the gas molecule and the adsorption vacant site, the classical Langmuir isotherm model expresses the reaction in terms of the species concentrations. Designed to capture the surface heterogeneity, the proposed thermodynamic Langmuir isotherm model substitutes the species concentrations with the species activities and calculates the species activity coefficients with the adsorption non-random two-liquid activity coefficient model. Here, the resulting isotherm model accurately represents pure component adsorption isotherms for gases with wide varieties of adsorbents including silica gels, activated carbons, zeolites and metal organic frameworks at various temperatures. With three physically meaningful parameters, the model outperforms the classical Langmuir isotherm model for the 98 isotherms of 33 systems examined.

View Accepted Manuscript (DOE)

Research Organization:: RAPID Manufacturing Institute, New York, NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office

Grant/Contract Number:: EE0007888

OSTI ID:: 1642080

Journal Information:: Adsorption, Journal Name: Adsorption Journal Issue: 3 Vol. 26; ISSN 0929-5607

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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An activity-based formulation for Langmuir adsorption isotherm

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