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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19132

Title: Reductive pyrolysis of leonardite humic acids
Authors: Stefanova, Maia
Gonsalvesh, Lenia-Nezaet
Marinov, S. P.
Czech, Jan
Carleer, Robert
Yperman, Jan
Issue Date: 2014
Abstract: Leonardite humic acids from Kaz Daglari (Turkey) are studied by reductive pyrolysis. Sample is pyrolysed in a H-2 flow in the temperature range 250 degrees C divided by 950 degrees C. Volatiles are trapped in two ice-cooled Tenax tubes. Atmosphere Pressure-Temperature Programmed Reduction (AP-TPR) technique coupled "off-line" with thermal desorption gas chromatography - mass spectrometry (TD-GC/MS) apparatus is used to specify organic compounds in the pyrolysate. During sample thermal decomposition a broad range of species is produced. Aliphatic compounds, i.e. n-alkenes/n-alkanes, i.e. nC(6)divided by nC(14); aromatic compounds, i.e. benzene, alkylated benzenes, naphthalenes, biphenyls; oxygen containing compounds, i.e. phenols, methoxy phenols, furans, benzofurans; sulphur containing compounds, i.e. polysulphides, thiophenes and nitrogen compounds, i.e. benzonitriles, indoles and quinolines. Leonardite organic matter is rich in oxygen, where phenolic structures are the most abundant. Compounds are quantitatively interpreted. According to pyrolysis data "average" structural units of leonardite humic acids from Kaz Daglari deposit are mainly composed by 1-2 aromatic cycles, condensed or coupled. Heteroatom compounds are also admitted. Experimental data argue for sample low maturity as rests of lignin building blocks, i.e. methoxy phenols, and carbohydrate degradation products, i.e., 2-methyl-2-cyclopenten-1-one, are still present.
Notes: [Stefanova, M.; Gonsalvesh, L.; Marinov, S. P.] Bulgarian Acad Sci, Ctr Phytochem, Inst Organ Chem, BU-1113 Sofia, Bulgaria. [Czech, J.; Carleer, R.; Yperman, J.] Hasselt Univ, Res Grp Appl & Analyt Chem, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/19132
ISI #: 000358337100020
ISSN: 0324-1130
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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