Adsorption of gas mixtures: Effect of energetic heterogeneity

✍ Scribed by D. P. Valenzuela; A. L. Myers; O. Talu; I. Zwiebel

• Publisher: American Institute of Chemical Engineers
• Year: 1988
• Tongue: English
• Weight: 470 KB
• Volume: 34
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690340306

✦ Synopsis

The ideal adsorbed solution (IAS) theory of adsorption of gas mixtures is extended to the case of energetic heterogeneity. A heterogeneous ideal adsorbed solution (HIAS) behaves ideally on a particular site, but energetic heterogeneity causes a segregation in the composition of the adsorbed phase. Equilibrium properties are obtained by integrating over a multivariate energy distribution based upon perfect positive correlation of site energies. The fact that predictions from HlAS are always an improvement over IAS indicates that heterogeneity is a factor that must be considered in theories of mixed-gas adsorption. Errors in HlAS predictions may be caused by steric exclusion of the larger molecules from micropores accessible to smaller molecules.