The rate of reaction can be expressed in terms of the surface coverages of the adsorbed species. Assuming that adsorption follows Langmuir isotherm, the rate equation can be written as:
where: - \( r \) is the rate of reaction - \( k \) is the rate constant for the surface reaction - \( \theta_A \) and \( \theta_B \) are the surface coverages of reactants A and B - \( K_A \) and \( K_B \) are the adsorption equilibrium constants for A and B - \( P_A \) and \( P_B \) are the partial pressures of A and B
