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Oxidation Kinetics of Monodisperse Spherical Carbonaceous Particles of Variable Properties

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.

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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].

Item Type:Article
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URLURL TypeDescription
Flagan, Richard C.0000-0001-5690-770X
Gavalas, George R.0000-0003-1468-6835
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.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG22-84PC70775
Issue or Number:3-4
Record Number:CaltechAUTHORS:20150805-110050653
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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, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59214
Deposited By: Irina Meininger
Deposited On:11 Sep 2015 22:26
Last Modified:10 Nov 2021 22:16

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