Levendis, Yiannis A. and Flagan, Richard C. and Gavalas, George R. (1989) Oxidation Kinetics of Monodisperse Spherical Carbonaceous Particles of Variable Properties. Combustion and Flame, 76 (3-4). pp. 221-241. ISSN 0010-2180. doi:10.1016/0010-2180(89)90108-9. https://resolver.caltech.edu/CaltechAUTHORS:20150805-110050653
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Abstract
Synthetic chars of variable physical and chemical properties have been developed to study char oxidation mechanisms and rates. The char particles were spherical and monodisperse, with sizes ranging from a few microns to several tens of microns. The particles were made from a carbon-yielding polymer and pore-forming additives. The surface areas of the chars made from different additives varied by more than two orders of magnitude and the porosities varied by a factor of five. The pore size distributions included both micro and transitional pores. X-ray studies revealed that all chars were amorphous when heat treated to temperatures up to 1600 K in an inert atmosphere. However, upon oxidation at 1600 K, the carbon matrix underwent partial graphitization. This transformation was particularly pronounced for some of the polymer pore-former chars. Combustion experiments showed that the total surface area of the chars increased dramatically with conversion, revealing the existence of a vast network of micropores. Apparent oxidation rates were higher for the chars that contained transitional pores in a microporous matrix. When compared with the rates reported in the literature for coal derived chars, the calculated intrinsic rates were lower at intermediate particle temperatures (800-1600 K) but comparable at elevated temperatures (1800-2300 K). As the temperature was increased further, the intrinsic rates decreased consistent with the Nagle and Strickland-Constable kinetic mechanism [l].
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Additional Information: | © 1989 by The Combustion Institute. Received 5 January 1988; revised 10 May 1988. This research was supported by the U.S. Department of Energy University Coal Programs grant number DE-FG22-84PC70775. The authors gratefully acknowledge technical assistance from Paul Scott Northrop, Patric Kohen, Sten Samson, Bob Johnson, and Bob Hously. | |||||||||
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Issue or Number: | 3-4 | |||||||||
DOI: | 10.1016/0010-2180(89)90108-9 | |||||||||
Record Number: | CaltechAUTHORS:20150805-110050653 | |||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150805-110050653 | |||||||||
Official Citation: | Yiannis A. Levendis, Richard C. Flagan, George R. Gavalas, Oxidation kinetics of monodisperse spherical carbonaceous particles of variable properties, Combustion and Flame, Volume 76, Issues 3–4, June 1989, Pages 221-241, ISSN 0010-2180, http://dx.doi.org/10.1016/0010-2180(89)90108-9. (http://www.sciencedirect.com/science/article/pii/0010218089901089) | |||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
ID Code: | 59214 | |||||||||
Collection: | CaltechAUTHORS | |||||||||
Deposited By: | Irina Meininger | |||||||||
Deposited On: | 11 Sep 2015 22:26 | |||||||||
Last Modified: | 10 Nov 2021 22:16 |
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