NDLI: The kinetics of thermo-oxidative humic acids degradation studied by isoconversional methods

Content Provider	Springer Nature Link
Author	Válková, D. Kislinger, J. Pekař, M. Kučerík, J.
Copyright Year	2007
Abstract	Humic acids represent a complicated mixture of miscellaneous molecules formed as a product of mostly microbial degradation of dead plant tissues and animal bodies. In this work, lignite humic acids were enriched by model compounds and the model-free method suggested by Šimon was used to evaluate their stability over the whole range of conversions during the first thermooxidative degradation step. The kinetic parameters obtained were used to predict the stability at 20 and 180°C, respectively, which served for the recognition of processes induced by heat and those naturally occurring at lower temperatures. Comparison of the conversion times brought a partial insight into the kinetics and consequently into the role of individual compounds in the thermooxidative degradation/stability of the secondary structure of humic acids. It has been demonstrated that aromatic compounds added to humic acids, except pyridine, increased stability of humic acids and intermediate chars. The same conclusion can be drawn for acetic and palmitic acids. Addition of glucose or ethanol decreased the overall humic stability; however, the char of the former showed the highest stability after 40% of degradation.
Starting Page	957
Ending Page	964
Page Count	8
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	89
Issue Number	3
e-ISSN	15728943
Language	English
Publisher	Springer US
Publisher Date	2007-08-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	DSC lignite humic acids isoconversional methods stability Measurement Science, Instrumentation Inorganic Chemistry Physical Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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