Table 2. Acidic Properties of These Samples Analyzed by Pyridine-FTIR.

	acid amount (umol/g)
samples	Brönsted	Lewis	Total	B/L
AC	2.81	24.38	27.19	0.11
S0	2.92	28.56	31.48	0.10
S2	2.50	23.76	26.26	0.11
S4	2.46	24.05	26.51	0.10
S6	1.62	24.83	26.45	0.07
S8	1.53	25.49	27.02	0.06
S10	1.45	25.84	27.29	0.06