Table 1.
The main characteristics of mesoporous silica SBA-15 and Pd/SBA-15 composites: SBET, specific surface area (m2/g), Vp, pore volume (cm3/g), Dp, average pore diameter (nm)
| Samplea | Actual Pd contentb (wt<) | ScBET (m2/g) | Vpd (cm3/g) | Dpd (nm) | Pd dispersione (<) |
|---|---|---|---|---|---|
| SBA-15-N |
- |
783 |
0.88 |
5.6 |
- |
| 3.8 wt< Pd/SBA-15-N |
3.2 |
482 |
0.81 |
6.4 |
39.0 |
| SBA-15-S |
- |
561 |
0.68 |
5.6 |
- |
| 3.8 wt< Pd/SBA-15-S | 3.7 | 432 | 0.67 | 6.0 | 19.0 |
SBA-15-N: necklacelike SBA-15; SBA-15-S: spherelike SBA-15.
aNominal palladium loading.
bDetermined by ICP-MS.
cCalculated by BET method.
dCalculated from adsorption branch by BJH method.
eMeasured by H2 chemisorption.