Characterization of micro-mesoporous carbon media

Do, D. D., Nguyen, C. and Do, H. D. (2001) Characterization of micro-mesoporous carbon media. Colloids And Surfaces A-physicochemical And Engineering Aspects, 187 51-71. doi:10.1016/S0927-7757(01)00621-5


Author Do, D. D.
Nguyen, C.
Do, H. D.
Title Characterization of micro-mesoporous carbon media
Journal name Colloids And Surfaces A-physicochemical And Engineering Aspects   Check publisher's open access policy
ISSN 0927-7757
Publication date 2001
Sub-type Article (original research)
DOI 10.1016/S0927-7757(01)00621-5
Volume 187
Start page 51
End page 71
Total pages 21
Editor P Somasundaran
H Moehwald
Place of publication Amsterdam
Publisher Elsevier
Collection year 2001
Language eng
Subject C1
250103 Colloid and Surface Chemistry
780102 Physical sciences
Abstract A simple method to characterize the micro and mesoporous carbon media is discussed. In this method, the overall adsorption quantity is the sum of capacities of all pores (slit shape is assumed), in each of which the process of adsorption occurs in two sequential steps: the multi-layering followed by pore filling steps. The critical factor in these two steps is the enhancement of the pressure of occluded 'free' molecules in the pore as well as the enhancement of the adsorption layer thickness. Both of these enhancements are due to the overlapping of the potential fields contributed by the two opposite walls. The classical BET and modified Kelvin equations are assumed to be applicable for the two steps mentioned above, with the allowance for the enhanced pore pressure, the enhanced adsorption energy and the enhanced BET constant,all of which vary with pore width. The method is then applied to data of many carbon samples of different sources to derive their respective pore size distributions, which are compared with those obtained from DFT analysis. Similar pore size distributions (PSDs) are observed although our method gives sharper distribution. Furthermore, we use our theory to analyze adsorption data of nitrogen at 77 K and that of benzene at 303 K (ambient temperature). The PSDs derived from these two different probe molecules are similar, with some small differences that could be attributed to the molecular properties, such as the collision diameter. Permeation characteristics of sub-critical fluids are also discussed in this paper. (C) 2001 Elsevier Science B.V. All rights reserved.
Keyword Chemistry, Physical
Activated Carbon
Pore Size Distribution
Pore Filling
Multi-layering Adsorption
Pore-size Distribution
Horvath-kawazoe Equations
Microporous Vycor Glass
Capillary Condensation
Activated Carbons
Adsorption-isotherm
Porous-media
Transport
Adsorbents
Nanospace
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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Created: Tue, 14 Aug 2007, 16:18:57 EST