Heat treatment-induced structural changes in SiC-derived carbons and their impact on gas storage potential

Bonilla, Mauricio Rincon, Bae, Jun-Seok, Nguyen, T. X. and Bhatia, Suresh K. (2010) Heat treatment-induced structural changes in SiC-derived carbons and their impact on gas storage potential. Journal of Physical Chemistry C, 114 39: 16562-16575. doi:10.1021/jp105473x

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Author Bonilla, Mauricio Rincon
Bae, Jun-Seok
Nguyen, T. X.
Bhatia, Suresh K.
Title Heat treatment-induced structural changes in SiC-derived carbons and their impact on gas storage potential
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
Publication date 2010-10-07
Sub-type Article (original research)
DOI 10.1021/jp105473x
Volume 114
Issue 39
Start page 16562
End page 16575
Total pages 14
Place of publication Washington, United States
Publisher American Chemical Society
Collection year 2011
Language eng
Formatted abstract
We investigate the effect of heat treatment on the structure of carbide-derived carbons (CDC) prepared by chlorination from nanosized βSiC particles and on their methane as well as hydrogen storage and delivery performance. Pore size and pore wall thickness distributions of the CDCs are obtained from interpretation of argon adsorption data using the finite wall thickness (FWT) model. The adequacy of the FWT model for adsorption modeling in the SiC-CDC samples is demonstrated by satisfactory prediction of subatmospheric and high pressure adsorption isotherms of CO2 and CH4 at 313 and 333 K. From the characterization results, it is observed that the SiC-CDC particles are predominantly amorphous with slight graphitization of the external surface. The degree of graphitization is more pronounced in the sample prepared at 1000 °C and increases slowly with heat treatment time. During this time the accessibility of methane molecules is found to increase, as a result of short-range ordering and opening up of pore entrances. Nevertheless, methane storage capacity is unsatisfactory, despite the high surface area and porosity, due to accessibility problems. On the other hand improvement in high pressure H2 uptake (4.61 wt % at 77 K) is obtained for SiC-CDC chlorinated at 800 °C and heat treated for one day. The recently predicted optimal delivery temperature of 115 K for hydrogen storage is found to be appropriate for this material. It is demonstrated that accessibility is an important issue to be addressed for methane storage in carbons, but which has hitherto not received attention for this application.
Copyright © 2010 American Chemical Society

Keyword Adsorption
Adsorption isotherms
Dielectric materials
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 15 times in Scopus Article | Citations
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Created: Sun, 24 Oct 2010, 00:13:22 EST