Related Experiment Video
Updated: Jul 8, 2026

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
Published on: August 25, 2016
Equilibrium distribution of gas molecules adsorbed on an active surface
Abstract:
We evaluate the exact equilibrium distribution of gas molecules adsorbed on an active surface with an infinite number of attachment sites. Our result is a Poisson distribution having mean X=&mgr;PP(s)/P(e), with &mgr; the mean gas density, P(s) the sticking probability, P(e) the evaporation probability in a time interval tau, and P Smoluchowski's exit probability in time interval tau for the surface in question. We then solve for the case of a finite number of attachment sites using the mean field approximation, recovering the Langmuir isotherm in this case.
Related Concept Videos
Homogeneous Equilibria for Gaseous Reactions
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
Analyte Adsorption and Distribution
Adsorption of Gases on Solids
Adsorption Isotherms I
Adsorption Isotherms II
Heterogeneous Catalysis

