Pore Characteristics and Hydrothermal Stability of Mesoporous Silica: Role of Oleic Acid

Table 1

Specific surface area and pore volume of nonmodified sample and oleic acid (OA) modified samples with heat treatment at various temperatures before and after hydrothermal and water treatment.

Heat treatment condition	Before treatment		Hydrothermall treatment at 105°C		Water treatment at 25°C
	Specific surface area (m^2/g)	Pore volume (cm^3/g)	Specific surface area (m^2/g)	Pore volume (cm^3/g)	Specific surface area (m^2/g)	Pore volume (cm^3/g)
Nonmodified	480	0.83	332	0.51	397	0.64
Heat treated at 80°C	272	0.6	604	1.09	518	0.83
Heat treated at 120°C	314	0.62	661	1.07	521	0.79
Heat treated at 180°C	284	0.63	512	0.86	390	0.64
Heat treated at 240°C	674	0.99	415	0.88	680	0.95