Three-Factor Kinetic Equation of Catalyst Deactivation.

Area of Science:

• Chemical kinetics
• Catalysis science
• Reaction engineering

Background:

• Catalyst deactivation significantly impacts industrial process efficiency and economics.
• Existing models often struggle to distinctly capture reversible and irreversible deactivation pathways.
• Understanding these mechanisms is crucial for designing robust catalytic systems.

Purpose of the Study:

• To develop a comprehensive kinetic equation for catalyst deactivation.
• To differentiate and model the main catalytic cycle, reversible deactivation, and irreversible aging.
• To validate the proposed model using literature data.

Main Methods:

• Formulation of a three-factor kinetic equation based on apparent kinetic parameters.
• Application of quasi-steady-state assumption for the main catalytic cycle.
• Hierarchical separation of reversible and irreversible deactivation phenomena.
• Mathematical analysis to determine conditions for separability.

Main Results:

• A novel three-factor kinetic equation for catalyst deactivation was derived.
• The equation successfully separates the main reaction cycle from reversible and irreversible deactivation.
• The model accurately describes literature data for acetaldehyde dehydration and crotonaldehyde hydrogenation.

Conclusions:

• The proposed kinetic equation provides a robust framework for understanding catalyst deactivation.
• The hierarchical separation approach enhances the predictive power of kinetic models.
• This work offers valuable insights for optimizing catalyst performance and longevity.