. 2010 Oct 18;15(10):7188–7196. doi: 10.3390/molecules15107188

Table 1.

The textural properties of the materials.

Samples	N₂ adsorption^(a)			S content (mmol g⁻¹)	Total acid density (mmol H⁺g⁻¹)	SO₃H density (mmol g⁻¹)
Samples	S. A.	P. V.	P. D.	S content (mmol g⁻¹)	Total acid density (mmol H⁺g⁻¹)	SO₃H density (mmol g⁻¹)
AC	751	0.47	2.5	0.26	0.30	0
AC-SO₃H	602	0.38	2.4	0.90	1.01	0.64
Nafion NR50	<1			0.45	0.49	0.45
Amberlyst-15	45			4.60	4.66	4.60

^(a) BET surface area (S. A.) in m² g⁻¹, pore volume (P. V.) in cm³ g⁻¹, pore diameter (P. D.) in nm.