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Surface barriers of hydrocarbon transport triggered by ideal zeolite structures
Citation Link: https://doi.org/10.15480/882.1530
Publikationstyp
Journal Article
Date Issued
2012
Sprache
English
Author(s)
Institut
TORE-DOI
Volume
116
Issue
5
Start Page
3677
End Page
3683
Citation
The Journal of Physical Chemistry C, 2012, 116 (5), pp 3677–3683
Publisher DOI
Scopus ID
Shedding light on the nature of surface barriers of nanoporous materials, molecular simulations (Monte Carlo, Reactive Flux) have been employed to investigate the tracer-exchange characteristics of hydrocarbons in defect-free single-crystal zeolite membranes. The concept of a critical membrane thickness as quantitative measure of surface barriers is shown to be appropriate and advantageous. Nanopore smoothness, framework density, and thermodynamic state of the fluid phase have been identified as the most important influencing variables of surface barriers. Despite the ideal character of the adsorbent, our simulation results clearly support current experimental findings on MOF Zn(tbip) where a larger number of crystal defects caused exceptionally strong surface barriers. Most significantly, our study predicts that the ideal crystal structure without any such defects will already be a critical aspect of experimental analysis and process design in many cases of the upcoming class of extremely thin and highly oriented nanoporous membranes.
Subjects
surface barriers
nanoporous materials
molecular simulations
hydrocarbons
zeolite
defects
MOF
DDC Class
620: Ingenieurwissenschaften
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