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Title

Characterization of humic acids from low-rank coals by 13C-NMR and pyrolysis-methylation. Formation of benzenecarboxylic acid moieties during the coalification process

AuthorsRío Andrade, José Carlos del CSIC ORCID ; González-Vila, Francisco Javier CSIC ORCID ; Martín Martínez, Francisco; Verdejo Robles, Trinidad CSIC
KeywordsPeat
Lignite
Coalification
Pyrolysis
Tetramethylammonium hydroxide (TMAH)
CP/MAS 13C-NMR
Benzenecarboxylic acids
Issue Date1994
PublisherElsevier
CitationOrganic Geochemistry 22(6): 885-891 (1994)
AbstractHumic acid (HA) fractions isolated from a peat and lignite deposit were studied by CP/MAS 13C-NMR and pyrolysis-methylation. Loss of carbohydrates, removal of methoxyls and formation of catechols during the coalification process was evident. Pyrolysis-methylation released a great variety of components, the lignin-derived monomers being the most prominent. A very striking feature was the release of benzenecarboxylic moieties after pyrolysis-methylation which have not been observed previously by pyrolytic techniques. These moieties were released in higher amounts from the lignite HA, suggesting that the content in carboxylic groups increase with coalification, at least up to the lignite stage. Oxidation of the C-3 side chain of the lignin structure would produce these benzenecarboxylic acids and benzylic ketones.
DescriptionInstituto de Recursos Naturales y Agrobiologia de Sevilla, C.S.I.C., P.O. Box 1052, 41080-Seville, Spain; E-mail address: delrio@irnase.csic.es
URIhttp://hdl.handle.net/10261/34961
Appears in Collections:(IRNAS) Artículos

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