Table 1. Chemical Composition, Acid Density, and Surface Area of N.Coal, MS.C, and SS.C samples.

	N.Coal	MS.C	SS.C
C (wt. %)	68.4	50.2	33.1
S (wt. %)	2.32	7.6	13.2
N (wt %)	2.53	7.8	10.1
H (wt %)	6.3	10.8	14.2
O (wt %)	10.6	24.4	29.3
acid density (mmol/g)	0.064	8.87	14.2
surface area (m2/g)	5.4	27.2	45.8
av pore diameter	50.2	44.2	23.6