Item | Fresh sample | After one year industrial operation | ||
|
| Upper part of upper layer lower layer | Lower part of upper layer | Middle part of |
Specific area | 115.1 | 105.2 | 92.7 | 99.4 |
Pore volume | 0.3609 | 0.2832 | 0.2953 | 0.3283 |
Average pore radius, nm | 62.81 | 59.50 | 63.63 | 59.99 |
Most probable radius, nm | 3.16 | 2.756 | 3.035 | 2.941 |
Pore distribution |
|
|
|
|
<25 nm | 57.47 | 57.79 | 57.31 | 56.48 |
25 - 50 nm | 5.11 | 6.05 | 7.28 | 5.91 |
50 - 150 nm | 13.95 | 20.38 | 22.61 | 27.11 |
>150 nm | 23.39 | 15.79 | 12.79 | 10.51 |
XRD phase composition | γ-Al2O3 | γ-Al2O3 | γ-Al2O3 | γ-Al2O3 |
| MgAl2O4 | MgAl2O4 | MgAl2O4 | MgAl2O4 |
| K2SO4 (micro amount) |