Unified network model for adsorption–desorption in systems with hysteresis

Show simple item record

dc.contributor.author Rajniak, Pavol en_US
dc.contributor.author Soós, Miroslav en_US
dc.contributor.author Yang, Ralph T. en_US
dc.date.accessioned 2007-01-17T15:55:59Z
dc.date.available 2007-01-17T15:55:59Z
dc.date.issued 1999-04 en_US
dc.identifier.citation Rajniak, Pavol; SoÓs, Miroslav; Yang, Ralph T. (1999)."Unified network model for adsorption–desorption in systems with hysteresis." AIChE Journal 45(4): 735-750. <http://hdl.handle.net/2027.42/49313> en_US
dc.identifier.issn 0001-1541 en_US
dc.identifier.issn 1547-5905 en_US
dc.identifier.uri http://hdl.handle.net/2027.42/49313
dc.description.abstract The problem of equilibrium and kinetics for adsorption–desorption of condensable vapors in porous media is studied experimentally and theoretically. For adsorption, the network model for diffusion based on pore blocking theory with percolation (in the network) added by effective medium approximation is further improved. A new predictive model based on properties of the Bethe lattices is proposed to account for the existence of liquid-filled “blind” pores that result in a decrease in the total diffusion rate. For desorption, a new “shell and core” (or shrinking core) representation of the network model is proposed. Information from adsorption–desorption equilibria is needed to compute the thickness of the shell in which desorption/evaporation occurs for concentrations higher than the percolation threshold. These models form a unified equilibrium-kinetics theory for gas-porous solid systems that exhibit hysteresis. The models are applied to the systems silica gel-water vapor and Vycor glass-nitrogen. Concentration-dependent Fickian diffusivities for these systems have been measured for both adsorption and desorption branches. The adsorption model successfully predicts the experimental data with a maximum in diffusivity. The desorption model correctly predicts the concentration dependence of diffusivity with a steep minimum at the percolation threshold. en_US
dc.format.extent 191991 bytes
dc.format.extent 3118 bytes
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.language.iso en_US
dc.publisher Wiley Subscription Services, Inc., A Wiley Company en_US
dc.subject.other Chemistry en_US
dc.subject.other Chemical Engineering en_US
dc.title Unified network model for adsorption–desorption in systems with hysteresis en_US
dc.type Article en_US
dc.rights.robots IndexNoFollow en_US
dc.subject.hlbsecondlevel Chemical Engineering en_US
dc.subject.hlbtoplevel Engineering en_US
dc.subject.hlbtoplevel Science en_US
dc.description.peerreviewed Peer Reviewed en_US
dc.contributor.affiliationum Dept. of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 ; Dept. of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 en_US
dc.contributor.affiliationother Dept. of Chemical and Biochemical Engineering, Slovak Technical University, 812 37 Bratislava, Slovakia en_US
dc.contributor.affiliationother Dept. of Chemical and Biochemical Engineering, Slovak Technical University, 812 37 Bratislava, Slovakia en_US
dc.description.bitstreamurl http://deepblue.lib.umich.edu/bitstream/2027.42/49313/1/690450409_ftp.pdf en_US
dc.identifier.doi http://dx.doi.org/10.1002/aic.690450409 en_US
dc.identifier.source AIChE Journal en_US
dc.owningcollname Interdisciplinary and Peer-Reviewed
 Show simple item record

This item appears in the following Collection(s)


Search Deep Blue

Advanced Search

Browse by

My Account

Information

Available Now


MLibrary logo