Table 1.
Physical and structural properties of the samples.
| Sample | Dcrysta (nm) | SSAb (m2g−1) | Dpc (nm) | Reaction rate constants kd (min−1) | Normalized rate constant kse (×10−3 min−1 Lm−2) | Eg (eV) |
|---|---|---|---|---|---|---|
| 140/30 | 56 | — | — | 0.035 | — | 2.00 |
| 160/30 | — | 174.6 | 2.97 | 0.033 | 0.94 | 1.91 |
| 180/30 | 47 | 61.02 | 2.97 | 0.063 | 5.16 | 1.93 |
| 200/15 | 68 | 28.85 | 3.08 | 0.087 | 15.08 | 1.94 |
| 200/30 | 68 | 35.61 | 2.88 | 0.083 | 11.65 | 1.95 |
| 200/60 | 47 | 35.62 | 2.88 | 0.072 | 10.10 | 1.95 |
| 200/15/400 | 79 | — | — | — | — | 2.05 |
| 200/15/450 | 79 | — | — | — | — | 2.02 |
| 200/15/500 | 68 | — | — | — | — | 2.01 |
| Commercial | 47 | 15.19 | 5.05 | 0.029 | 9.54 | 2.05 |
a
Dcryst is the crystal domain size determined from x-ray line broadening by using the Scherrer equation.
b
SSA is the specific surface area evaluated by using the BET method.
c
Dp is the BJH mean pore size obtained on the desorption branch.
d
k is the apparent reaction rate constant calculated from a pseudo-first-order kinetic model.
e
ks is the rate constant k normalized to SSA, ks = k (catalyst concentration × SSA)−1.