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Unified network model for adsorption–desorption in systems with hysteresis

dc.contributor.authorRajniak, Pavolen_US
dc.contributor.authorSoós, Miroslaven_US
dc.contributor.authorYang, Ralph T.en_US
dc.date.accessioned2007-01-17T15:55:59Z
dc.date.available2007-01-17T15:55:59Z
dc.date.issued1999-04en_US
dc.identifier.citationRajniak, 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.issn0001-1541en_US
dc.identifier.issn1547-5905en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/49313
dc.description.abstractThe 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.extent191991 bytes
dc.format.extent3118 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherWiley Subscription Services, Inc., A Wiley Companyen_US
dc.subject.otherChemistryen_US
dc.subject.otherChemical Engineeringen_US
dc.titleUnified network model for adsorption–desorption in systems with hysteresisen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelChemical Engineeringen_US
dc.subject.hlbtoplevelEngineeringen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDept. of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 ; Dept. of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109en_US
dc.contributor.affiliationotherDept. of Chemical and Biochemical Engineering, Slovak Technical University, 812 37 Bratislava, Slovakiaen_US
dc.contributor.affiliationotherDept. of Chemical and Biochemical Engineering, Slovak Technical University, 812 37 Bratislava, Slovakiaen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/49313/1/690450409_ftp.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1002/aic.690450409en_US
dc.identifier.sourceAIChE Journalen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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