Monolayer adsorption of gas mixtures on homogeneous and heterogeneous solids

✍ Scribed by S.E. Hoory; J.M. Prausnitz

• Publisher: Elsevier Science
• Year: 1967
• Tongue: English
• Weight: 704 KB
• Volume: 22
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(67)80166-0

✦ Synopsis

A systematic thermodynamic treatment is described for mobile, monolayer adsorption of gas mixtures on homogeneous surfaces. By defining a surface fugacity for each component, nonideality of mixing in the monolayer is related to constants in the two-dimensional equation of state. The results obtained are extended to heterogeneous surfaces using the concept of surface patches as developed by Ross. To characterize surface heterogeneity for a binary mixture, three heterogeneity parameters are required; two of these are the variances of the adsorption potential distributions for the pure components, while the third is their covariance. For nonpolar gases which are chemically similar, it is possible to make good estimates of mixed-gas adsorption on heterogeneous surfaces using only data obtained for pure components.