Authors: Yu.N. Dudnikova, Sozinov , N.I. Fedorova, Ismagilov Z.R.

Title of the article: Method for determination of porous structure parameters for fossil coals of metamorphism series

Year: 2019, Issue: 4, Pages: 55-63

Branch of knowledge: 05.17.07 Chemical technology of fuel and high-energy substances

Index UDK: 539.217.1

DOI: 10.26730/1999-4125-2019-4-55-63

Abstract: The paper presents methodological aspects of the porous structure measuring parameters on the analyzer ASAP 2020 "Micromeritics" for fossil coals. The conditions for sample preparation (degassing temperature, degassing time) were selected, which make it possible to record reproducible adsorption isotherms of nitrogen desorption by the studied samples of fossil coal of various grades. The textural characteristics of the fossil coals of metamorphism series, such as specific surface, total pore volume, volume of micro- and mesopores in coal samples of various grades were determined. The textural characteristics of the fossil coal of various grades were calculated by various methods (the specific surface area of the pores was calculated using the Brunauer-Emmette-Taylor method (BET); micropore volume was determined using the comparative t-Plot method; mesopore volume was determined using the Barrett-Joyner-Halenda method (BJH)) from the nitrogen adsorption-desorption isotherms at low temperature (77K) obtained by the ASAP 2020 «Micromeritics» analyzer software. The results of the study of the porous structure of fossil coals of a metamorphism series make it possible to identify their macro- and microstructural features, as well as to obtain information about the adsorption properties of coal. This information can be used to optimize the use of coal, such as the extraction of methane from coal seams, gasification, combustion, liquefaction, enrichment, production of metallurgical coke.

Key words: Fossil coals specific surface area micropores mesopores low temperature nitrogen adsorption

Receiving date: 01.07.2019

Publication date: 19.12.2019

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