What are the Common Assumptions in Catalytic Models?
Catalytic models often rely on several key assumptions to make the equations more manageable and solvable. Here are some of the most common ones:
Steady-State Assumption: In many catalytic models, it is assumed that the concentrations of intermediate species do not change over time. This simplification allows for easier mathematical treatment of the system. Langmuir-Hinshelwood Mechanism: This assumption states that the reaction occurs on the surface of the catalyst and that the rate-determining step is the adsorption of reactants or the desorption of products. Ideal Gas Behavior: Often, it is assumed that gases involved in the catalytic process behave ideally. This means that the interactions between gas molecules are negligible. Uniform Catalyst Surface: The catalyst surface is often assumed to be uniform, meaning that all active sites are identical and equally accessible to reactants. Negligible Mass Transfer Resistance: In some models, it is assumed that the resistance to mass transfer to and from the catalyst surface is negligible. This focuses the model on the intrinsic reaction kinetics.
