Table 1. Physicochemical properties of mesoporous metal oxides.

materials	pore properties			Wall properties
	SBETa (m2/g)	Vtot b (cm3/g)	Dp c (nm)	phase d	thickness e (nm)
titania (d ~ 4 nm)
Si/Ti = 0	65	014	–	rutile	8.3
0.25	254	0.60	23	anatase (rutile)	5.4
0.50	180	0.44	32	anatase (rutile)	5.1
0.75	195	0.38	20	anatase	4.5
1.0	225	0.33	12	anatase	5.1
2.0	132	0.21	8	anatase	4.8
titania (d ~ 6 nm)
Si/Ti = 1.0	285	0.62	33	anatase	5.7
2.0	245	0.51	27	anatase	5.9
3.0	272	0.59	30	anatase	5.9
tin oxide Si/Sn = 1.00	80	021	13	cassiterite	11.7
mixed oxides
M = Ti + 0.05 Sn Si/M = 0.75	193	0.30	11	anatase	5.8
M = Ti + 0.05 Zr Si/M = 0.75	177	0.41	18	anatase	5.8

^aSurface areas were calculated by BET method.

^bTotal pore volumes of the materials were estimated from N₂ sorption isotherms at p/p₀ = 0.99.

^cMesopore sizes were calculated from the adsorption branches of the N2 sorption isotherms by using BJH method.

^dCrystalline structure were determined from X-ray diffraction patterns.

^eThe wall thickness was calculated by using the Scherrer equation.