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Changes in coal composition during air oxidation at 200–250°C

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. 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0016-2361(87)90234-1DOIArticle
http://www.sciencedirect.com/science/article/pii/0016236187902341PublisherArticle
ORCID:
AuthorORCID
Gavalas, G. R.0000-0003-1468-6835
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.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG22-83 PC60801
Subject Keywords:oxidation of coal instrumental methods; chemical characterization
Issue or Number:2
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:03 Oct 2019 09:13

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