Description of multicomponent adsorption and absorption phenomena from a single viewpoint

Area of Science:

• Physical Chemistry
• Thermodynamics
• Surface Science

Background:

• Adsorption and absorption are crucial phenomena in various chemical processes.
• Existing models for multicomponent systems are often specialized and lack a unified theoretical basis.

Purpose of the Study:

• To derive a single, unified equation for describing multicomponent adsorption and absorption.
• To provide a phenomenological thermodynamic framework for understanding these phenomena.
• To demonstrate the derivation of established adsorption models from the proposed equation.

Main Methods:

• Development of a free-volume state equation for the adsorbed phase.
• Application of phenomenological thermodynamics to derive interphase equilibrium equations.
• Generalization of the derived equation for multicomponent gas mixtures.

Main Results:

• A novel equation representing interphase equilibrium has been derived.
• The equation successfully describes both multicomponent adsorption and absorption.
• Classical adsorption equations (Henry, Langmuir, Fowler-Guggenheim, Temkin, BET) are shown to be special cases of the proposed equation.
• Constants in the derived equation possess clear physical interpretations.

Conclusions:

• The proposed thermodynamic approach offers a unified perspective on adsorption and absorption.
• The derived equation provides a more fundamental understanding of various adsorption models.
• This work lays the foundation for further theoretical and experimental investigations into multicomponent interfacial phenomena.