Calculation of immersion enthalpy data from adsorption isotherms

Area of Science:

• Physical Chemistry
• Thermodynamics
• Surface Science

Background:

• Understanding the thermodynamic behavior of liquid mixtures adsorbed on solid surfaces is crucial for various applications.
• Excess formalism provides a framework for analyzing adsorption phenomena.
• Calorimetric measurements are essential for validating thermodynamic models.

Purpose of the Study:

• To present thermodynamic equations for calculating binary and ternary immersion data using excess formalism.
• To calculate immersion enthalpies and entropies for specific alkane mixtures on activated carbon.
• To validate the predictive capability of the thermodynamic model against experimental calorimetric data.

Main Methods:

• Derivation of thermodynamic equations for immersion data calculation.
• Analysis of temperature-dependent adsorption isotherms for binary and ternary mixtures.
• Calculation of immersion enthalpies and entropies.
• Comparison of calculated immersion enthalpies with experimentally measured calorimetric data.

Main Results:

• Thermodynamic equations for excess immersion data were successfully formulated.
• Immersion enthalpies and entropies for n-hexane/n-octane/n-tetradecane mixtures on activated carbon were calculated.
• Calculated immersion enthalpies for binary mixtures showed good agreement with calorimetric measurements.

Conclusions:

• Phenomenological thermodynamics provides a reliable method for predicting calorimetric data.
• Adsorption excess isotherms can be effectively used to forecast immersion enthalpies.
• The developed thermodynamic approach is valuable for surface science and physical chemistry studies.