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.