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  4. Grand canonical molecular dynamics simulations of transport diffusion in geometrically heterogeneous pores
 
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Grand canonical molecular dynamics simulations of transport diffusion in geometrically heterogeneous pores

Publikationstyp
Journal Article
Date Issued
2003
Sprache
English
Author(s)
Düren, Tina  
Jakobtorweihen, Sven  
Keil, Frerich 
Seaton, Nigel A.  
Institut
Chemische Reaktionstechnik V-2  
TORE-URI
http://hdl.handle.net/11420/15102
Journal
Physical chemistry, chemical physics  
Volume
5
Issue
2
Start Page
369
End Page
375
Citation
Physical Chemistry Chemical Physics 5 (2): 369-375 (2003)
Publisher DOI
10.1039/b207843k
Scopus ID
2-s2.0-0037243953
Most transport diffusion simulation studies are carried out in single pores with simple geometries such as slit-like pores or straight cylindrical pores. Such models are gross simplifications of the structure of real, geometrically heterogeneous adsorbents. We carried out grand canonical molecular dynamics simulations of binary, counter diffusing CH4/CF4 mixtures in different cylindrical model pores with pore radii ranging from) 11 to 23 Å. Each of these pore models represents a feature that can be found in real adsorbents such as pores with amorphous surfaces, pores with a change in the cross-sectional area, pores with kinks and simple pore networks. The results were compared to simulation results in straight pores with homogeneous surfaces to investigate the extent to which transport diffusion can be represented by these simplified model pores. Our results show that transport diffusion is hardly influenced by the different pore structures studied in this work. The simulation results can be reproduced by straight pores if the correct average radius, flow length and enclosing gradient are chosen.
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