Kalema, W. S. and Gavalas, G. R. (1987) Changes in coal composition during air oxidation at 200–250°C. Fuel, 66 (2). pp. 158-164. ISSN 0016-2361. doi:10.1016/0016-2361(87)90234-1. https://resolver.caltech.edu/CaltechAUTHORS:20151105-124153112
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Abstract
Air oxidation of two bituminous coals and a lignite was carried out in a fluidized bed reactor at 200–250 °C. The gaseous products were analysed by gas chromatography and solid samples were titrated to determine carboxylic and total acidity and were subjected to ^(13)C n.m.r. spectrometry to determine the fraction of aromatic carbon. Elemental composition, heating value and ash content were also determined. During the first few hours oxidation-induced devolatilization proceeded simultaneously with oxidation. Oxidation of the high volatile bituminous coal for 12 h at 200 °C raised the carboxylic groups from 0.37 to 2.1 meq g^(−1) and the total acidity from 1.5 to 5.3 meq g^(−1). The acidic groups seem to be largely distinct from oxygenated groups that are precursors to CO and CO_2 products. Oxidation of the same coal at 200 °C consumed aromatic as well as aliphatic carbon at relative amounts 1:3 to 1:4.
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| Additional Information: | © 1987 Butterworth & Co. Received 5 March 1986; revised 28 April 1986. Part of this work was funded by DOE-PETC. University Research Program. Grant No. DE-FG22-83 PC60801. | |||||||||
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| Subject Keywords: | oxidation of coal instrumental methods; chemical characterization | |||||||||
| Issue or Number: | 2 | |||||||||
| DOI: | 10.1016/0016-2361(87)90234-1 | |||||||||
| Record Number: | CaltechAUTHORS:20151105-124153112 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20151105-124153112 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 61901 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 06 Nov 2015 19:56 | |||||||||
| Last Modified: | 10 Nov 2021 22:55 |
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