Authors: N.I. Fedorova, I.Yu. Zykov

Title of the article: Evaluation of the reactivity of brown coal carbonates using thermogravimetric analysis

Year: 2024, Issue: 1, Pages: 43-51

Branch of knowledge: 2.6.12. Chemical technology of fuel and high-energy substances

Index UDK: 661.183.2

DOI: 10.26730/1999-4125-2024-1-43-51

Abstract: The traditional technology for producing carbon sorbents based on hard coals includes a carbonation stage of the feedstock and an activation stage for the development of a porous structure, directly related to the reactivity of carbonizates with respect to various kinds of oxidants. The porous structure and reactivity to oxidizing agents are prerequisites for good activability of carbon carbonates. Therefore, the study of the oxidation process of carbon materials that differ in structure and physico-chemical parameters is relevant. The purpose of the study is to determine the reactivity to oxygen of porous carbonized materials by thermogravimetric analysis. Five carbonates obtained on the basis of coal of technological grade B. The samples are characterized by different ash content, elemental composition, specific surface area and total pore volume. Based on the results of thermogravimetric analysis, the temperature limits of oxidative pyrolysis of the studied samples were established: ignition temperatures, temperatures at which the maximum oxidation rate is reached, complete combustion temperatures, and the values of the oxidation temperature range were determined. Taking into account the time parameters, the ignition and combustion indices are calculated. Gorenje. It was found that with an increase in the parameter of the degree of molecular association of carbonizate substances (cA), there is a decrease in the values of the temperature range of oxidative degradation (T2–T1), the maximum rate of mass loss (Vmax), as well as the oxidation index (S). Comparative analysis has shown that carbonizate samples with lower temperature limits of the oxidation process have an increased reactivity with respect to oxidants.

Key words: brown coal carbonisates thermogravimetric analysis reactivity ignition temperature ignition index

Receiving date: 12.12.2023

Approval date: 15.02.2024

Publication date: 12.03.2024

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