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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3908

Title: CHARACTERIZATION BY C-13 CP/MAS NMR-SPECTROSCOPY OF THE STRUCTURAL-CHANGES IN COALS AFTER CHEMICAL TREATMENTS
Authors: FRANCO, Dirk
GELAN, Jan
Martens, H.
VANDERZANDE, Dirk
Issue Date: 1991
Publisher: BUTTERWORTH-HEINEMANN LTD
Citation: FUEL, 70(7). p. 811-817
Abstract: C-13 CP/MAS spectra have been used for the characterization of two different coal types and their derived products, obtained after mild and severe treatment. The carbon aromaticity (f(a)C) was determined by fitting signal areas in CP/MAS spectra to an expression that describes the evolution of carbon magnetization with the experimental contact time. Proper modification of the CP/MAS pulse sequence allows separation of protonated and non-protonated carbons. This technique is used to determine the carbon aromaticity of the non-protonated carbons. This parameter is related, together with the f(a)C, to the coal structure. Our results are compared with literature data for both coal types.
Notes: FRANCO, DV, LIMBURGS UNIV CENTRUM,DEPT SBM,B-3590 DIEPENBEEK,BELGIUM.
URI: http://hdl.handle.net/1942/3908
DOI: 10.1016/0016-2361(91)90187-F
ISI #: A1991FV51400002
ISSN: 0016-2361
Type: Journal Contribution
Appears in Collections: Research publications

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