From Langmuir isotherm to Brunauer–Emmett–Teller isotherm
Abstract
Abstract 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.
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1831339
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- AIChE Journal
- Additional Journal Information:
- Journal Name: AIChE Journal Journal Volume: 68 Journal Issue: 3; Journal ID: ISSN 0001-1541
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Vyawahare, Pradeep, Tun, Hla, Vaughn, Mark W., and Chen, Chau‐Chyun. From Langmuir isotherm to Brunauer–Emmett–Teller isotherm. United States: N. p., 2021.
Web. doi:10.1002/aic.17523.
Vyawahare, Pradeep, Tun, Hla, Vaughn, Mark W., & Chen, Chau‐Chyun. From Langmuir isotherm to Brunauer–Emmett–Teller isotherm. United States. https://doi.org/10.1002/aic.17523
Vyawahare, Pradeep, Tun, Hla, Vaughn, Mark W., and Chen, Chau‐Chyun. Thu .
"From Langmuir isotherm to Brunauer–Emmett–Teller isotherm". United States. https://doi.org/10.1002/aic.17523.
@article{osti_1831339,
title = {From Langmuir isotherm to Brunauer–Emmett–Teller isotherm},
author = {Vyawahare, Pradeep and Tun, Hla and Vaughn, Mark W. and Chen, Chau‐Chyun},
abstractNote = {Abstract 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.},
doi = {10.1002/aic.17523},
journal = {AIChE Journal},
number = 3,
volume = 68,
place = {United States},
year = {Thu Nov 18 00:00:00 EST 2021},
month = {Thu Nov 18 00:00:00 EST 2021}
}
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