Transport of n-paraffins in zeolite T

Mass transport of n‐heptane, n‐nonane, and n‐dodecane in zeolite T was studied using a gravimetric uptake technique. The sigmoidal shape of the uptake curves indicated the existence of a nondiffusional resistance in the transport process. To compute the transport parameters, an approach based on the...

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Bibliographic Details
Published in:AIChE journal 1996-01, Vol.42 (1), p.68-86
Main Authors: Magalhães, Fernão D., Laurence, Robert L., Conner, William Curtis
Format: Article
Language:English
Subjects:
Activation energy
Chemistry
Desorption
Exact sciences and technology
General and physical chemistry
Gravimetric analysis
Isotherms
Mathematical models
Paraffins
Saturation (materials composition)
Solid-gas interface
Sorption
Surface physical chemistry
Zeolites
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Summary:Mass transport of n‐heptane, n‐nonane, and n‐dodecane in zeolite T was studied using a gravimetric uptake technique. The sigmoidal shape of the uptake curves indicated the existence of a nondiffusional resistance in the transport process. To compute the transport parameters, an approach based on the temporal moments of the uptake curves was developed. A model involving an external resistance dependent on the local slope of the sorption isotherm best represented the data. No evidence of the “window effect” reported by Gorring was found. The measured diffusivities decrease with chain length, while the activation energies remain essentially constant. Both resistances (diffusional and nondiffusional) depend strongly on lattice loading, and their relative contributions for the transport time change as saturation is approached.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690420108