Authors: A.E. Vorob'yov, A.N. Korchevskyi, K.A. Vorob'ev

Title of the article: Classification and characteristics of coal pores

Year: 2026, Issue: 1, Pages: 161-170

Branch of knowledge: 2.8.8 Geotechnology, mining machines

Index UDK: 662.749; 662.276; 539.217

DOI: 10.26730/1999-4125-2026-1-161-170

Abstract: The paper presents a classification and characterization of coal pores. Various types of pores and nanopores in coals are shown. The study utilized modern coal pore testing technologies and classification methods to systematically summarize and scientifically describe the main characteristics of coal pore structure. Thus, innovative analytical technologies such as optical and scanning electron microscopy (OM and SEM) were used to study and describe the qualitative and quantitative assessment of the complex coal pore structure. The coal pore classification methods were based on their division by genetic type, size, and morphology. According to this classification, all coal pores were divided into micropores (<10 nm in diameter), transitional pores (10-100 nm in diameter), mesopores (100-1000 nm in diameter), and macropores (>1000 nm in diameter). Based on the nature of their interaction with gases (primarily methane), micropores and transition pores are classified as adsorption pores (<100 nm ), which are the primary space for gas adsorption, while mesopores and macropores are classified as gas permeation pores (>100 nm ). The influence of coal quality on porosity is explained. The pore size distribution for various coal samples and the change in pore volume depending on coal grade are presented. The influence of metamorphism on the development of coal pores is described. It was established that metamorphism, tectonic deformation, and existing macerals are the main internal factors influencing the characteristics and distribution parameters of coal pores. The relationship between specific surface area, porosity, average pore radius, and coal grade is presented.

Key words: coal porosity pore classification pressures distribution parameters

Receiving date: 04.08.2025

Approval date: 15.01.2026

Publication date: 19.03.2026

CITE DOWNLOAD