Characterization of heat-treated porous carbons using argon adsorption

Nguyen, Thanh X. ; Bhatia, Suresh K. (2006) Characterization of heat-treated porous carbons using argon adsorption Carbon, 44 (4). pp. 646-652. ISSN 0008-6223

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The microstructural variation of Norit R1 Extra activated carbon, progressively heated at 1373 K, was explored in terms of pore size and pore wall thickness distributions, for various periods of heating time, determined by argon adsorption at 87 K, both using an infinite as well as and finite wall thickness model. The latter approach has recently been developed in our laboratory and has been applied to several virgin carbons. The current results show significant variations in small pore size regions (<7 Å) in association with strong growth of thick walls having at least three carbon sheets, as a result of heat treatment. In particular, shrinkage of the smallest pores due to strong interaction between their opposite walls as well as smoothening of carbon wall surfaces due to an increase in graphitization degree under thermal treatment have been found. Further, the results of pore wall thickness distribution are well corroborated by X-ray diffraction. The results of pore size and pore wall thickness distributions are also shown to be consistent with transmission electron microscopy analyses.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Activated Carbon; Adsorption; Heat Treatment; Microstructure; Microporosity
ID Code:2905
Deposited On:09 Oct 2010 05:43
Last Modified:17 May 2011 05:51

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