Open AccessThermal analysis of mechanochemically activated humic acids of brown coal
Author(s) -
С.Г. Мамылов,
Tatiana Skripkina,
В. Д. Тихова,
А. Л. Бычков,
O. I. Lomovsky
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1675/1/012093
Subject(s) - thermal decomposition , chemistry , decarboxylation , decomposition , humic acid , inert gas , coal , inert , gel permeation chromatography , brown coal , pyrolysis , salt (chemistry) , alkali metal , inorganic chemistry , organic chemistry , polymer , catalysis , fertilizer
Humic acids of brown coal before and after mechanochemical treatment under various conditions were studied by TG and DSC (carried out both in air and in an inert atmosphere, with the temperature range of 300–800 K), and gel permeation chromatography. The obtained data were used to calculate the values of the energy of activation and the thermal effects for each stage of thermal decomposition. Influence of mechanochemical treatment upon humic acids thermolysis stages was shown. Hypothesis of thermal stages chemical interpretation was proposed. The staged decomposition of humic acids includes the stages of decarboxylation of acid groups of various types. A change in the staging of decomposition is observed upon mechanochemical introduction of alkali into humic acids, associated with the conversion of acid groups to the salt form.