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Type: Journal article
Title: Evaluation of methods for determining the pore size distribution and pore-network connectivity of porous carbons
Author: Cai, Q.
Buts, A.
Biggs, M.
Seaton, N.
Citation: Langmuir: the ACS journal of surfaces and colloids, 2007; 23(16):8430-8440
Publisher: Amer Chemical Soc
Issue Date: 2007
ISSN: 0743-7463
Statement of
Q. Cai, A. Buts, M. J. Biggs, and N. A. Seaton
Abstract: The pore size distribution (PSD) and the pore-network connectivity of a porous material determine its properties in applications such as gas storage, adsorptive separations, and catalysis. Methods for the characterization of the pore structure of porous carbons are widely used, but the relationship between the structural parameters measured and the real structure of the material is not yet clear. We have evaluated two widely used and powerful characterization methods based on adsorption measurements by applying the methods to a model carbon which captures the essential characteristics of real carbons but (unlike a real material) has a structure that is completely known. We used three species (CH4, CF4, and SF6) as adsorptives and analyzed the results using an intersecting capillaries model (ICM) which was modeled using a combination of Monte Carlo simulation and percolation theory to obtain the PSD and the pore-network connectivity. There was broad agreement between the PSDs measured using the ICM and the geometric PSD of the model carbon, as well as some systematic differences which are interpreted in terms of the pore structure of the carbon. The measured PSD and connectivity are shown to be able to predict adsorption in the model carbon, supporting the use of the ICM to characterize real porous carbons.
Description: Copyright © 2007 American Chemical Society
DOI: 10.1021/la7007057
Appears in Collections:Aurora harvest
Chemical Engineering publications
Environment Institute publications

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