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Physical Adsorption on Non-Uniform Surfaces
Abstract
Analysis of adsorption on a uniform surface using the quasi-chemical theory of interaction shows that the hypotheses of the BET theory lead to substantially no adsorption beyond the first layer if E2 = EL, and stepwise isotherms if E1>E2>E3>···>EL. For the monolayer adsorption of gases on silver, platinum, and steel, the heterogeneous nature of the adsorbing surface is clearly indicated. Cooperative adsorption on the non-uniform surface is treated, and the cooperative analog of the Freundlich equation derived. The typical multi-layer isotherm is shown to be composed of three regions: non-cooperative adsorption on a strongly heterogeneous surface; cooperative adsorption on a still heterogeneous surface; and cooperative multi-layer adsorption induced by small van der Waals perturbations some distance from the surface. The isotherm p/p0=exp{—a/θr} is derived and shown to be a good representation of adsorption data that conform to the BET Type I, II, or III shapes.
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Cited by
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Murphy, O. P., Vashishtha, M., Palanisamy, P., & Kumar, K. V. (2023) · ACS Omega · doi:10.1021/acsomega.2c08155 · Cited by 367
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Metadata
- Authors
- Halsey, G.
- Venue
- The Journal of Chemical Physics
- Publisher
- AIP Publishing
- Published
- 1948-10-01
- Volume
- 16
- Issue
- 10
- Pages
- 931-937
- ISSN
- 0021-9606 (ISSN-L)
- 1089-7690
- OpenAlex
- W2055989793
- Cited by
- 1,472
- References
- 0
- FWCI
- 3.33
- Type
- journal article
- Language
- en
- Open access
- closed
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