Characterization of accessible and inaccessible pores in microporous carbons by a combination of adsorption and small angle neutron scattering

Nguyen, Thanh X. and Bhatia, Suresh K. (2012) Characterization of accessible and inaccessible pores in microporous carbons by a combination of adsorption and small angle neutron scattering. Carbon, 50 8: 3045-3054. doi:10.1016/j.carbon.2012.02.091


Author Nguyen, Thanh X.
Bhatia, Suresh K.
Title Characterization of accessible and inaccessible pores in microporous carbons by a combination of adsorption and small angle neutron scattering
Journal name Carbon   Check publisher's open access policy
ISSN 0008-6223
1873-3891
Publication date 2012-07-01
Sub-type Article (original research)
DOI 10.1016/j.carbon.2012.02.091
Volume 50
Issue 8
Start page 3045
End page 3054
Total pages 10
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2013
Language eng
Formatted abstract
We determine the pore size distribution for five activated carbons (comprising carbide derived as well as commercial activated carbon samples) by the interpretation of experimental small angle neutron scattering (SANS) intensity profiles, based on the primary assumption of an infinitely dilute solution of hollow spherical particles. The interpretation yields the pore size distribution of the carbon samples that have predominantly micropore populations (size <20 ), but not for carbons which have significant mesopore populations of sizes up to 48 and high mass fractal degrees. The pore size distribution (PSD) results based on SANS data reveal significant populations of micropores of size <6.1 , and mesopores of size >20 , which are not present in the PSD results based on adsorption isotherms of either Ar at 87 K or CO 2 273 K. This inaccessible porosity becomes accessible to CO 2 and Ar on heat treatment, leading to increase in the adsorption based pore volume. However, the surface area does not commensurately increase, indicating the inaccessible microporosity to predominantly comprise surface defects and roughness that are removed on heat treatment or activation. This finding sheds the light onto the evolution of porosity of activated carbons during gasification or post synthesis-treatment.
Keyword Carbide-Derived Carbons
Heat-Treatment
Fibers
Coal
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 7 March 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2013 Collection
 
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