Adsorption and desorption kinetics for diffusion controlled systems with a strongly concentration dependent diffusivity

• Main Author: Ruthven, Douglas M.
• Other Authors: University of Maine, Department of Chemical Engineering
• Format: Article
• Language: English
• Published: Universitätsbibliothek Leipzig 2016
• Subjects: Diffusion; Transport; diffusion; transport; ddc:530
• Online Access: http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-193874; http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-193874; http://www.qucosa.de/fileadmin/data/qucosa/documents/19387/diff_fund_6%282007%2951.pdf

The formal solution to the diffusion equation for transient adsorption in a semiinfinite medium with a strongly concentration dependent diffusivity, originally derived by Fujita ( 3 ), has been extended to desorption. Profiles for adsorption and desorption are compared and simplified asymptotic expressions which are useful when the diffusivity ratio is large are derived. The effect of a strongly concentration dependent diffusivity on adsorption and desorption kinetics is briefly considered.