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, Stefan CZECH, Jan CARLEER, Robert YPERMAN, Jan |
Issue Date: | 2014 | Publisher: | BULGARIAN ACAD SCIENCE | Source: | BULGARIAN CHEMICAL COMMUNICATIONS, 46, p. 123-128 | 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. | Keywords: | leonardite; humic acids; pyrolysis; structural study;leonardite; humic acids; pyrolysis; structural study | Document URI: | http://hdl.handle.net/1942/19132 | ISSN: | 0324-1130 | ISI #: | 000358337100020 | Rights: | © 2014 Bulgarian Academy of Sciences, Union of Chemists in Bulgaria. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2016 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
BCC_2014_46-SE-A_123-128.pdf | Published version | 403.93 kB | Adobe PDF | View/Open |
WEB OF SCIENCETM
Citations
2
checked on Oct 15, 2024
Page view(s)
18
checked on Aug 9, 2022
Download(s)
6
checked on Aug 9, 2022
Google ScholarTM
Check
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.