A Multiscale Structural Analysis of Soft and Hard Coal Deposits in Deep High-Gas Coal Seams

Figure 9

Low-temperature nitrogen adsorption and desorption curves of the coal samples in each coal seam. (a) No. 4 hard coal. (b) No. 4 soft coal. (c) No. 13 hard coal. (d) No. 13 soft coal.

(a)

(b)

(c)

(d)