The Langmuir adsorption isotherm is a model that describes the adsorption of a gas onto a solid surface. It assumes that adsorption occurs at specific homogeneous sites within the catalyst surface and that each site can hold only one adsorbate molecule. The isotherm is represented by the equation:
θ = (K * P) / (1 + K * P)
where θ is the fraction of the surface covered, K is the adsorption equilibrium constant, and P is the pressure of the gas.
