Experimental Study on the Pore Structure of Middle- and Low-Rank Coal and Its Influence on Methane Adsorption

Table 2

Test results of pore specific surface area by liquid nitrogen adsorption method.

Project		PDS	WZ	XJ
BET specific surface area (m^2/g)		7.2	9.1	5.2
Area ratio of each aperture (%)	<10 nm	87.4	80.3	68.2
	10~100 nm	9.2	14.9	31.1
	>100 nm	3.4	4.8	0.7