Microscopic Pore Structural Characteristics in Coal Particles

Abstract

AbstractIn order to investigate the internal pore structure of coal, the adsorption isotherms of coal particles with different sizes were measured using the Quantachrome Autosorb-iQ specific surface area and pore size analyzer. The pore characteristic parameters obtained were analyzed including the specific surface area, pore volume and average pore diameter. The use of low pressure nitrogen adsorption allowed us to gain clearer insight into the structural characteristics of pores in the coal body. The results indicate that the adsorption isotherms of coal particles with different sizes displayed a similar variation trend. The specific surface area and total pore volume of coal particles decreased gradually with increasing particle size. Whereas, the average pore size increased with the rise of particle size. The results can provide theoretical foundation for studying the gas adsorption, desorption and seepage flow mechanism of coal.