Diesel Oxidation Catalyst (DOC) Honeycomb Carrier
- Diameter Size : 93-330mm
- Length: 76~177.8mm
- Material: Cordierite Ceramic
- Application :designed to efficiently purify harmful pollutants in exhaust gas and meet global strict emission standards
- Specification
- FAQs
Diesel Oxidation Catalyst (DOC) Honeycomb Carrier
Product Introduction
The Diesel Oxidation Catalyst (DOC) Honeycomb Carrier is the core component of the diesel engine exhaust after-treatment system, designed to efficiently purify harmful pollutants in exhaust gas and meet global strict emission standards. It serves as a stable substrate for precious metal catalysts (Pt/Pd), ensuring rapid activation and long-term reliable operation in harsh diesel exhaust environments.
Core Material & Structural Advantages
The main material of our DOC honeycomb carrier is cordierite (chemical formula: 2MgO·2Al₂O₃·5SiO₂), which features excellent thermal shock resistance with a low thermal expansion coefficient (≈1.0×10⁻⁶/℃). It can withstand continuous high temperatures of 800-1000℃ and short-term high temperatures of up to 1200℃, along with high mechanical strength, acid and alkali resistance, and cost-effectiveness, making it the preferred choice for mainstream diesel exhaust applications. The chemical formula of cordierite is stable at high temperatures, ensuring no decomposition or structural damage during the exhaust purification process.
For scenarios requiring rapid cold-start ignition, we also offer optional metal carriers (Fe-Cr-Al alloy), which have faster thermal conductivity and quicker light-off performance, adapting to high-frequency cold-start working conditions.
Key Specifications
• Cell Density (CPSI): 300/400/600 CPSI (mainstream specifications), 100-600 CPSI customizable; 400/4 and 600/3 thin-wall models are recommended for National VI/Euro VI emission standards.
• Wall Thickness: 0.16-0.5 mm, thin-wall design effectively reduces back pressure and improves exhaust flow efficiency.
• Open Area Ratio: 60%-70%, with a large specific surface area (100-200 m²/L) to ensure sufficient catalyst loading and reaction efficiency.
• Dimensions & Shape: Circular is the mainstream shape, with oval, racetrack and custom special shapes available. Routine dimensions are shown in the following table:
|
Shape Type |
Key Dimensions |
Common Specifications |
|
Circular (Mainstream) |
Diameter (Φ): 76mm-330.2mm; Length (H): 30mm-203.2mm |
Φ76×50mm, Φ101.6×100mm, Φ101.6×152.4mm, Φ127×152mm, Φ150×100mm, Φ266.7×203.2mm |
|
Oval |
Long Axis × Short Axis × Length |
112×80×(30-152.4)mm, 120.65×80.01×(30-152.4)mm |
|
Racetrack |
Special oval-like structure |
Φ101.6×100mm (racetrack type), 146.8×77×86.4mm, 120.6×80×152.4mm |
• Note: All routine dimensions are compatible with 300/400/600 CPSI (mainstream cell density) and meet Euro 4/5/6, National III-VI emission standards.
Core Functions & Performance
After coating with precious metal catalysts (Pt/Pd), the DOC honeycomb carrier achieves the following core functions, among which the purification reaction is realized through specific chemical reactions:
1.Pollutant Oxidation: Efficiently oxidizes CO to CO₂, HC to CO₂ and H₂O, and SOF (Soluble Organic Fraction) to CO₂ and H₂O. The key chemical reaction formulas for purification are clearly listed below, which are the core principles of the DOC honeycomb carrier's pollutant purification function:
1. Carbon Monoxide (CO) Purification Reaction: 2CO + O₂ → 2CO₂ (Under the catalysis of Pt/Pd, carbon monoxide is completely oxidized into non-toxic carbon dioxide)
2. Hydrocarbon (HC) Purification Reaction (taking propane, a typical HC component in diesel exhaust, as an example): C₃H₈ + 5O₂ → 3CO₂ + 4H₂O (Hydrocarbons are oxidized into harmless carbon dioxide and water)
3. Soluble Organic Fraction (SOF) Purification Reaction: CₙHₘ + (n + m/4)O₂ → nCO₂ + (m/2)H₂O (SOF, the soluble organic component in particulate matter, is fully oxidized to achieve purification)
The purification efficiency reaches ≥90% for CO, ≥80% for HC, and 20%-40% for PM reduction.
4.Temperature Control Assistance: The exothermic oxidation reaction raises the exhaust gas temperature to 250-400℃, providing necessary temperature conditions for DPF regeneration and SCR efficient reaction.
5.Structural Support: The honeycomb structure provides a stable attachment surface for catalysts, with strong vibration resistance and high-temperature aging resistance, extending the service life of the entire after-treatment system to more than 80,000 kilometers.
Product Size :
|
Product Size |
|||||||
|
No. |
Specification (D×L) (in.×in.) |
Cell Density (cpsi) |
Diameter (in.) |
Height (in.) |
Diameter (mm) |
Height (mm) |
Volume (L/pc) |
|
1 |
5.66×3 |
600 |
5.66 |
3 |
143.8 |
76.2 |
1.236 |
|
2 |
5.66×4 |
600 |
5.66 |
4 |
143.8 |
101.6 |
1.648 |
|
3 |
5.66×5 |
600 |
5.66 |
5 |
143.8 |
127 |
2.061 |
|
4 |
5.66×6 |
600 |
5.66 |
6 |
143.8 |
152.4 |
2.473 |
|
5 |
6.77×3 |
600 |
6.77 |
3 |
172 |
76.2 |
1.769 |
|
6 |
6.77×4 |
600 |
6.77 |
4 |
172 |
101.6 |
2.358 |
|
7 |
6.77×5 |
600 |
6.77 |
5 |
172 |
127 |
2.948 |
|
8 |
6.77×6 |
600 |
6.77 |
6 |
172 |
152.4 |
3.538 |
|
9 |
7.5×3 |
600 |
7.5 |
3 |
190.5 |
76.2 |
2.171 |
|
10 |
7.5×4 |
600 |
7.5 |
4 |
190.5 |
101.6 |
2.894 |
|
11 |
7.5×6 |
600 |
7.5 |
6 |
190.5 |
152.4 |
4.342 |
|
12 |
7.5×7.5 |
600 |
7.5 |
7.5 |
190.5 |
190.5 |
5.427 |
|
13 |
9×6 |
600 |
9 |
6 |
228.6 |
152.4 |
6.252 |
|
14 |
9.5×4 |
600 |
9.5 |
4 |
241.3 |
101.6 |
4.644 |
|
15 |
9.5×4.5 |
600 |
9.5 |
4.5 |
241.3 |
114.3 |
5.224 |
|
16 |
9.5×5 |
600 |
9.5 |
5 |
241.3 |
127 |
5.805 |
|
17 |
9.5×6 |
600 |
9.5 |
6 |
241.3 |
152.4 |
6.966 |
|
18 |
9×7.5 |
600 |
9 |
7.5 |
228.6 |
190.5 |
7.815 |
|
19 |
10.5×4 |
600 |
10.5 |
4 |
266.7 |
101.6 |
5.673 |
|
20 |
10.5×4.5 |
600 |
10.5 |
4.5 |
266.7 |
114.3 |
6.382 |
|
21 |
10.5×5 |
600 |
10.5 |
5 |
266.7 |
127 |
7.091 |
|
22 |
10.5×6 |
600 |
10.5 |
6 |
266.7 |
152.4 |
8.509 |
|
23 |
10.5×7 |
600 |
10.5 |
7 |
266.7 |
177.8 |
9.928 |
|
24 |
11.25×4 |
600 |
11.25 |
4 |
285.8 |
101.6 |
6.515 |
|
25 |
11.25×4.5 |
600 |
11.25 |
4.5 |
285.8 |
114.3 |
7.329 |
|
26 |
11.25×5 |
600 |
11.25 |
5 |
285.8 |
127 |
8.143 |
|
27 |
11.25×6 |
600 |
11.25 |
6 |
285.8 |
152.4 |
9.772 |
|
28 |
11.25×7 |
600 |
11.25 |
7 |
285.8 |
177.8 |
11.401 |
|
29 |
12×4 |
600 |
12 |
4 |
304.8 |
101.6 |
7.41 |
|
30 |
12×4.5 |
600 |
12 |
4.5 |
304.8 |
114.3 |
8.336 |
|
31 |
12×5 |
600 |
12 |
5 |
304.8 |
127 |
9.262 |
|
32 |
12×6 |
600 |
12 |
6 |
304.8 |
152.4 |
11.114 |
|
33 |
12×7 |
600 |
12 |
7 |
304.8 |
177.8 |
12.967 |
|
34 |
13×4 |
600 |
13 |
4 |
330.2 |
101.6 |
8.696 |
|
35 |
13×4.5 |
600 |
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