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Statistical Mechanics of Multimolecular Adsorption II. Localized and Mobile Adsorption and Absorption
Abstract
It is shown that the transition from localized to mobile adsorption (in the first adsorbed layer) takes place at rather low temperatures for potential barriers of around 1000 cal./mole or less, so that localized physical adsorption should be a very rare phenomenon at the temperatures usually employed in adsorption experiments. Since the BET (and Langmuir) isotherm actually assumes localized adsorption, a new approximate isotherm equation is derived here on the basis of a mobile first layer obeying a two-dimensional van der Waals' equation. This isotherm is in semiquantitative agreement with the two-dimensional phase changes observed by Jura and co-workers, and by earlier workers, at very low pressures. The localized-mobile transition in the absorption of hydrogen by metals is mentioned briefly. The relationships between (1) the two-dimensional equation of state of a monolayer, (2) the adsorption isotherm of the monolayer, and (3) the ordinary three-dimensional equation of state of the gas being adsorbed are discussed in some detail.
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Cited by
Modelling and interpretation of adsorption isotherms
Ayawei, N., Ebelegi, A. N., & Wankasi, D. (2017) · Journal of Chemistry · doi:10.1155/2017/3039817 · Cited by 2,957
Monolayer and multilayer adsorption isotherm models for sorption from aqueous media
Saadi, R., Saadi, Z., Fazaeli, R., & Fard, N. E. (2015) · Korean Journal of Chemical Engineering · doi:10.1007/s11814-015-0053-7 · Cited by 708
Statistical Mechanics of Adsorption. V. Thermodynamics and Heat of Adsorption
Hill, T. L. (1949) · The Journal of Chemical Physics · doi:10.1063/1.1747314 · Cited by 329
Self-citationHill, T. L. (1952) · Advances in Catalysis · doi:10.1016/s0360-0564(08)60615-x · Cited by 318
Self-citationEfficient and cost-effective adsorbent brick sand nanoparticles used for removal of heavy metals
Karim, A., Hossain, D., Hossain, I., Dipti, S. S., & Azad, A. K. (2024) · Water Science · doi:10.1080/23570008.2024.2307197 · Cited by 11
Metadata
- Authors
- Hill, T. L.
- Venue
- The Journal of Chemical Physics
- Publisher
- AIP Publishing
- Published
- 1946-07-01
- Volume
- 14
- Issue
- 7
- Pages
- 441-453
- ISSN
- 0021-9606 (ISSN-L)
- 1089-7690
- OpenAlex
- W1989804923
- Cited by
- 267
- References
- 0
- FWCI
- 2.60
- Type
- journal article
- Language
- en
- Open access
- closed
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- Hill, T. L. (1946). Statistical Mechanics of Multimolecular Adsorption II. Localized and Mobile Adsorption and Absorption. The Journal of Chemical Physics. https://doi.org/10.1063/1.1724166
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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