Influence of Pore Density of Honeycomb Ceramic Carrier on Noble Metal Distribution
Briefly introduce the influence of honeycomb ceramic carrier pore density on precious metal distribution.
Influence of Pore Density of Honeycomb Ceramic Carrier on Noble Metal Distribution
Pore density (cpsi) directly affects coating loading, uniformity of precious metal distribution, and mass transfer efficiency.
The Influence of Pore Density on Coating and Precious Metal Distribution
Pore density | Coating uniformity | Precious metal distribution | Explanation |
100-150 | Good | Small area, low utilization rate | Suitable for dusty conditions |
200-300 | Excellent | Uniform, highest utilization rate | Preferred for industrial applications |
350-400 | Poor | Pore aggregation, insufficient internal density | Difficult to control high-pore density coating |
High-porosity carrier slurry deposits at the pore opening, resulting in an excessively thick inlet coating and insufficient internal coating. Most precious metals concentrate at the pore opening, leading to reduced utilization.
The Influence of Pore Density on Mass Transfer and Pressure Drop
Pore density | Mass transfer efficiency | Pressure drop | Characteristics |
100-150 | General | Low | Wide channel |
200-300 | High | Medium | Optimal overall |
350-400 | High but limited | High | Flow deviation risk |
Selection Recommendations
Application Scenarios | Recommended Pore Densities |
Dust-laden exhaust gas | 100-150 cpsi (anti-clogging) |
Conventional VOCs treatment | 200-300 cpsi (most commonly used) |
High concentration, high efficiency requirements | 300-350 cpsi |
Laboratory/scale testing | 200-300 cpsi |
Summary
The impact of pore density on precious metal distribution can be summarized as follows: 200-300 cpsi is the optimal range—resulting in uniform coating, high precious metal utilization, good mass transfer efficiency, and moderate pressure drop.
Low pore density (100-150) is suitable for dusty conditions, but results in low precious metal utilization; high pore density (350-400) produces a large coating area but uneven distribution and severe pore pooling. Selection must be coordinated with the coating process; simply increasing pore density cannot guarantee improved precious metal utilization.