Application of the Van't Hoff Equation to Adsorption Equilibria

Authors

H. H. Rowley, State University of IowaFollow
W. B. Innes, State University of IowaFollow

Document Type

Research

Abstract

Isothermal adsorption data for many gases and vapors on charcoal and other adsorbents have been shown by various investigators (1), (2), (3), (4), to agree satisfactorily with the Langmuir adsorption isotherm, except for deviations, possibly due to multilayer adsorption, as the pressure of the saturated vapor is approached. The Langmuir equation is derived on the hypothesis of a unimolecular adsorbed layer. The rate of adsorption, assumed proportional to the pressure p and the fraction of the surface unoccupied, (1 - ϑ), is equated to the rate of desorption which is assumed proportional to the fraction of the surface covered, ϑ, giving the equation below.

Publication Date

1940

Journal Title

Proceedings of the Iowa Academy of Science

Volume

47

Issue

1

First Page

165

Last Page

170

Copyright

©1940 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Recommended Citation

Rowley, H. H. and Innes, W. B. (1940) "Application of the Van't Hoff Equation to Adsorption Equilibria," Proceedings of the Iowa Academy of Science, 47(1), 165-170.
Available at: https://scholarworks.uni.edu/pias/vol47/iss1/28