|
Size (mm) |
Pore Volume (ml·g⁻¹) |
Porosity (%) |
Specific Surface Area (m²·g⁻¹) |
Bulk Density (kg·m⁻³) |
Average Crushing Strength (Side, N/particle) |
|
|
φ3 |
0.49–0.55 |
57.6 |
837 |
900 |
150 |
|
|
φ6 |
0.53–0.60 |
59.8 |
953 |
850 |
200 |
|
|
φ10 |
0.62–0.75 |
61.3 |
1032 |
820 |
450 |
|
|
φ13 |
0.68–0.82 |
65.7 |
1175 |
820 |
700 |
|
|
φ19 |
0.73–0.86 |
71.4 |
1196 |
800 |
800 |
|
|
φ25 |
0.83–0.92 |
72.8 |
1241 |
760 |
900 |
|
|
φ50 |
0.96–0.98 |
76.6 |
1423 |
720 |
1000 |
|
Bird's Nest Guard Catalyst, when placed in the top bed of a reactor, serves the following primary functions:
1.1 Filtration of Impurities
It filters both inert and active impurities.
- Inert Impurities: Mainly include gums, carbon particles, silica gel particles, iron sulfide, etc.
- Active Impurities: Mainly oil-soluble organometallic compounds, such as calcium naphthenate, iron naphthenate, etc.
- The unique triangular pore design and high pore density of the Bird's Nest Guard enable highly efficient impurity filtration. Its pore size is controllable, and its loading is graded and configured based on pore size and impurity type, maximizing the utilization of void space throughout the entire bed.
1.2 Reduction of Bed Pressure Drop
The Bird's Nest Guard possesses exceptionally high porosity and bed cross-sectional open area. Compared to conventional guard catalysts, it can reduce pressure drop by 40–50% or more.
1.3 Pre-denitrogenation
The Bird's Nest Guard is impregnated with active metals such as Ni and Mo. Its primary purpose is to decompose oil-soluble organometallic compounds under hydrogenation conditions, but it also possesses denitrogenation functionality.
1.4 Lower Hydrogen Consumption Rate
The Bird's Nest active graded protection system has a significantly larger visible specific surface area and total effective specific surface area than spherical, cylindrical, trilobal, or quadrilobal guard catalysts. This allows gas and liquid to spread more fully along its surface. Furthermore, the Bird's Nest has several times more gas-liquid cutting points than spherical, cylindrical, or trilobal/quadrilobal guards. This multiplies the surface renewal rate of the gas-liquid after cutting as it spreads along the catalyst surface. Consequently, the contact between the feedstock oil and the catalyst surface becomes much more thorough, which greatly enhances hydrogen utilization and significantly reduces the hydrogen consumption rate.
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