What question did this study set out to answer?

To resolve theoretical limitations of standard adsorption models and describe physical gas adsorption behaviors across non-uniform solid surfaces.

October 1, 1948The Journal of Chemical PhysicsOpen Access

Physical Adsorption on Non-Uniform Surfaces

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Authors

GHG. D. HalseyHarvard University

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Implication

Theoretical analysis demonstrates multilayer gas adsorption across non-uniform metal surfaces, suggesting a unified isotherm model spanning classical adsorption types.

Key Points

To resolve theoretical limitations of standard adsorption models and describe physical gas adsorption behaviors across non-uniform solid surfaces.
Applied the quasi-chemical theory of interaction to evaluate adsorption energetics on uniform and heterogeneous surfaces.
Analyzed monolayer gas adsorption data on silver, platinum, and steel substrates to characterize surface heterogeneity.
Formulated mathematical models for cooperative adsorption, deriving a cooperative analog of the Freundlich equation and a generalized isotherm equation.
Demonstrated that classical Brunauer-Emmett-Teller (BET) hypotheses on uniform surfaces inherently suppress multilayer adsorption when higher-layer energy equals liquefaction energy, or produce stepwise isotherms.
Segmented typical multilayer isotherms into three operational zones: non-cooperative adsorption, cooperative surface adsorption, and distant van der Waals-driven cooperative layering.
Derived the isotherm p/p0 = exp(-a/θ^r), confirming it accurately fits experimental gas adsorption data corresponding to BET Types I, II, and III profiles.

Cite This Study

G. D. Halsey (1948) studied this question.

synapsesocial.com/papers/6a6f1c10febe604dd708233c https://doi.org/10.1063/1.1746689

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October 1, 1948The Journal of Chemical PhysicsOpen Access

Physical Adsorption on Non-Uniform Surfaces

View Full Paper

Ask AI

Bookmark

Authors

GHG. D. HalseyHarvard University

Discussion

Member takes

Implication

Theoretical analysis demonstrates multilayer gas adsorption across non-uniform metal surfaces, suggesting a unified isotherm model spanning classical adsorption types.

Key Points

To resolve theoretical limitations of standard adsorption models and describe physical gas adsorption behaviors across non-uniform solid surfaces.
Applied the quasi-chemical theory of interaction to evaluate adsorption energetics on uniform and heterogeneous surfaces.
Analyzed monolayer gas adsorption data on silver, platinum, and steel substrates to characterize surface heterogeneity.
Formulated mathematical models for cooperative adsorption, deriving a cooperative analog of the Freundlich equation and a generalized isotherm equation.
Demonstrated that classical Brunauer-Emmett-Teller (BET) hypotheses on uniform surfaces inherently suppress multilayer adsorption when higher-layer energy equals liquefaction energy, or produce stepwise isotherms.
Segmented typical multilayer isotherms into three operational zones: non-cooperative adsorption, cooperative surface adsorption, and distant van der Waals-driven cooperative layering.
Derived the isotherm p/p0 = exp(-a/θ^r), confirming it accurately fits experimental gas adsorption data corresponding to BET Types I, II, and III profiles.

Cite This Study

G. D. Halsey (1948) studied this question.

synapsesocial.com/papers/6a6f1c10febe604dd708233c https://doi.org/10.1063/1.1746689

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