| 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) |
|||