Analysis of Surface Area and Pore Structure of Datong Coal

The surface area and pore structure of Datong coal and the influence of coal particle size on them were studied.Nitrogen adsorption experiments at 77.4 K of the coal samples with different particle sizes were done using an ASAP2020 surface area and pore structure analyzer made in American Micromeritics company.Some conclusions are drawn which by analyzing the experimental data.There are seriate pores with continuous diameters in the coal, some of which are fracture-type.The pore volume of the coal is mainly mede up of big-and middle-sized pores,whereas a large portion of the surface area of the coal is composed of small-and middle-sized pores.The coal structure changed with the reduction of the coal particle size,which makes the surface area and pore volume in the coal increase,whereas the average pore diameter in the coal decrease.