Abstract
13C 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 aC) 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 aC, to the coal structure. Our results are compared with literature data for both coal types.
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