Effects of the juxtaposition of carbonaceous slit pores on the overall transport behavior of adsorbed fluids

Jepps, O. G., Bhatia, S. K. and Searles, D. J. (2005) Effects of the juxtaposition of carbonaceous slit pores on the overall transport behavior of adsorbed fluids. Langmuir, 21 1: 229-239. doi:10.1021/la047984g


Author Jepps, O. G.
Bhatia, S. K.
Searles, D. J.
Title Effects of the juxtaposition of carbonaceous slit pores on the overall transport behavior of adsorbed fluids
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
Publication date 2005
Sub-type Article (original research)
DOI 10.1021/la047984g
Volume 21
Issue 1
Start page 229
End page 239
Total pages 11
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2005
Language eng
Subject C1
290603 Membrane and Separation Technologies
780102 Physical sciences
Abstract It is a common approximation in the modeling of adsorption in microporous carbons to treat the pores as slit pores, whose walls are considered to consist of an infinite number of graphitic layers. In practice, such an approximation is appropriate as long as the number of graphitic layers in the wall is greater than three. However, it is understood that pore walls in microporous carbons commonly consist of three or fewer layers. As well as affecting the solid-fluid interaction within a pore, such narrow walls permit the interaction of fluid molecules through the wall, with consequences for the adsorption characteristics. We consider the effect that a distributed pore-wall thickness model can have on transport properties. At low density we find that the only significant deviation in the transport properties from the infinite pore-wall thickness model occurs in pores with single-layer walls. For a model of activated carbons with a distribution of pore widths and pore-wall thicknesses, the transport properties are generally insensitive to the effects of finite walls, in terms of both the solid-fluid interaction within a pore and fluid-fluid interaction through the pore walls.
Keyword Microporous Carbons
Methane Adsorption
Wall Heterogeneity
Simulation
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 05:35:48 EST