Crystalline structure transformation of carbon anodes during gasification

Tran, Kien N., Berkovich, Adam J., Tomsett, Alan and Bhatia, Suresh K. (2008) Crystalline structure transformation of carbon anodes during gasification. Energy & Fuels, 22 3: 1902-1910. doi:10.1021/ef700732p


Author Tran, Kien N.
Berkovich, Adam J.
Tomsett, Alan
Bhatia, Suresh K.
Title Crystalline structure transformation of carbon anodes during gasification
Journal name Energy & Fuels   Check publisher's open access policy
ISSN 0887-0624
Publication date 2008-05-01
Year available 2008
Sub-type Article (original research)
DOI 10.1021/ef700732p
Open Access Status
Volume 22
Issue 3
Start page 1902
End page 1910
Total pages 9
Editor M. T. Klein
Place of publication Washington , D.C.
Publisher American Chemical Society
Language eng
Subject C1
960202 Atmospheric Processes and Dynamics
0904 Chemical Engineering
Abstract The crystalline structure transformation of five carbon anodes during gasification in air and carbon dioxide was studied using quantitative X-ray diffraction (XRD) analysis and high-resolution transmission electron microscopy (HRTEM). XRD analysis and HRTEM observations confirmed that anodes have a highly ordered graphitic structure. The examination of partially gasified samples indicated that crystalline structure transformation occurred in two stages during gasification. The first stage involved the consumption of disorganized carbon matter in the initial 15% conversion. Oxygen was found to be more reactive toward disorganized carbon at this stage of the gasification process compared to carbon dioxide. Following this stage, as more carbon was consumed, especially with the removal of smaller crystallites, it was found that the crystalline structure became more ordered with increasing conversion levels. This is due to the merging of neighboring crystallites, required to maintain the minimum energy configuration. In addition, the interaction between the pitch and the coke components was found to be strongly linked to the initial coke structure. “Stress graphitization” occurred at the pitch−coke interface, which helps to enhance the structural development of the anodes.
Keyword X-ray-diffraction
Coal Char
Reactivity
Combustion
Temperature
Oxidation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Publication Date (Web): April 5, 2008

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Chemical Engineering Publications
 
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Created: Tue, 07 Apr 2009, 23:23:40 EST by Katherine Montagu on behalf of School of Chemical Engineering