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Description
Aftermarket Cordierite SCR+ASC Catalyst for Trucks and Buses Reduces Harmful Gases and Enhances Air QualityProduct Introduction SCR+ASC for Diesel Exhaust Systems Product name SCR+ASC Material Cordierite Diameter 240mm High 100 127mm Cpsi 300 400 Customization Support Error 0. 1mm Quality High standard Package Neutral packaging Price includes 1 pcs Filter +1 pcs liner Sellers Notes Checklist Important things 1 Due to the small number of sample orders, it is difficult for us to coat and we need to wait for production with other customers. The delivery time
Product Introduction
SCR+ASC for Diesel Exhaust Systems
| Product name | SCR+ASC | Material | Cordierite |
| Diameter | 240mm | High | 100/127mm |
| Cpsi | 300/400 | Customization | Support |
| Error | ±0.1mm | Quality | High standard |
| Package | Neutral packaging | Price includes |
1 pcs Filter +1 pcs liner |
Sellers’ Notes Checklist
Important things |
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|---|---|
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1 |
• Due to the small number of sample orders, it is difficult for us to coat and we need to wait for production with other customers. The delivery time is about 10-15 days. If you mind the delivery time, please do not pay, or buy 5-10 pieces, we can expedite the order |
|
2 |
• Vanadium-based molecular sieves cannot be used in EURO6 models because they cannot convert nitrogen oxides in the low temperature range. EURO5 models can use vanadium-based molecular sieves/copper-based molecular sieves. EURO6 models can only use copper-based molecular sieves. |
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3 |
• ASC is usually made together with SCR copper molecular sieve. For example, for a 5-inch high-speed, we usually use the last 2 inches to coat ASC. (Note: This is our general solution. If there are special requirements, we can customize it.) |
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4 |
• Color Difference •Vanadium molecular sieve--yellow •Copper molecular sieve--light green |
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5 |
• In addition, SCR usually has three kinds of base materials, and one is iron molecular sieve, but we use it less. If you need iron molecular sieve SCR-ASC, please contact us |
| Product link is the price of a single sample | For bulk purchases, please contact our staff | |
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| Project | SCR | SCR+ASC |
|---|---|---|
| Function | Converts nitrogen oxides (NOx) in exhaust gas into harmless nitrogen (N₂) and water (H₂O). | On the basis of SCR, further eliminate unreacted residual ammonia (NH₃ escape) to avoid secondary pollution |
| How it works | 1. Urea injection: Urea solution is sprayed into the exhaust pipe and hydrolyzed at high temperature to generate ammonia (NH₃). 2. Catalytic reduction: NH₃ undergoes a selective reduction reaction with NOx on the surface of the SCR catalyst to generate N₂ and H₂O. 3. Catalyst type: Vanadium-based (V₂O₅-WO₃/TiO₂) or zeolite molecular sieve (such as Cu-ZSM-5) |
1. Location: ASC is located downstream of the SCR catalyst. 2. Catalytic oxidation: Use precious metal catalysts (such as Pt/Pd) to selectively oxidize escaped NH₃ to N₂ instead of NOx. 3. Anti-overoxidation: The reaction conditions need to be precisely controlled to avoid excessive oxidation of NH₃ to generate NOx. |
| Catalytic reaction equation |
Main reaction (ideal conditions): 4NH3+4NO+O2--4N2+6H2O Side reactions (high NO₂ ratio): 2NH3+NO+NO2--2N2+3H2O |
Main reaction of NH₃ oxidation: 4NH3+3O2--2N2+6H2O Synergistic reaction with residual NOx: 4NH3+6NO--5N2+6H2O |
| Item | SCR | SCR + ASC |
|---|---|---|
| Core Function | Remove NOₓ | Remove NOₓ + Eliminate NH₃ slip |
| Reducing Agent Requirement | Require urea solution | Require urea solution |
| Catalyst Type | Vanadium - based or zeolite molecular sieve | SCR catalyst + precious metals (Pt/Pd, etc.) |
| Reaction Product | N₂ + H₂O | N₂ + H₂O (no NH₃ residue) |
| Emission Control | Meet NOₓ limit value | Meet NOₓ limit value + NH₃ emission limit value |
| System Complexity | Lower | Higher (require ASC module integration) |
Summary of technical points
1. SCR is the core of NOx purification, but the amount of urea injection needs to be precisely controlled to avoid insufficient NH₃ (low NOx conversion rate) or excessive NH₃ (NH₃ escape).
2. ASC is a supplement to SCR to solve the problem of NH₃ escape, especially suitable for scenarios where regulations have strict restrictions on NH₃ emissions (such as National VI b stage).
3. Collaborative design: SCR and ASC need to match exhaust flow rate and temperature window (ASC operating temperature is usually 200-450°C) to ensure overall efficiency.
FAQ on SCR and SCR+ASC catalytic conversion reaction of diesel vehicles
1. What are SCR and SCR+ASC?
SCR (Selective Catalytic Reduction): By injecting urea solution into the exhaust gas, urea decomposes to produce ammonia (NH₃). Under the action of the catalyst, ammonia selectively reduces nitrogen oxides (NOₓ) to nitrogen (N₂) and water (H₂O), mainly used to reduce NOₓ emissions in diesel vehicle exhaust.
SCR+ASC (Ammonia Escape Catalytic Converter): Add an ASC module on the basis of SCR. ASC can catalytically oxidize excess ammonia (ammonia escape) after the SCR reaction into nitrogen and water, further reducing ammonia pollution to the environment.
2. What is the core difference between SCR and SCR+ASC?
SCR only reduces NOₓ, while SCR+ASC can not only reduce NOₓ, but also eliminate ammonia that may escape from the SCR system, meeting stricter NOₓ and NH₃ emission limits.
3. What are the advantages of SCR+ASC?
Reduce the pollution of ammonia escape to the atmosphere (such as avoiding the formation of ammonium salt particles);
Meet more stringent emission regulations (such as controlling NOₓ and NH₃ emissions at the same time);
Improve the overall efficiency of the system and avoid ammonia waste.
4. In what scenarios is SCR+ASC suitable?
In areas with strict emission regulations (such as National VI and above);
Application scenarios with extremely high requirements for exhaust emissions, such as urban buses, logistics transport vehicles, etc.
5. What are the precautions for the maintenance of both?
SCR: Regularly check whether the urea injection system is blocked and monitor the activity of the catalyst (to avoid high-temperature sintering or poisoning).
SCR+ASC: In addition to the maintenance of SCR, it is necessary to pay extra attention to whether the ASC module is blocked or the catalyst fails, and regularly clean up impurities such as carbon deposits.
6. How is the emission effect compared?
SCR: Only control NOₓ emissions to within the limit;
SCR+ASC: While controlling NOₓ, NH₃ emissions are also reduced to an extremely low level, which is more environmentally friendly.
7. How to solve the ammonia slip problem in SCR?
Through the SCR+ASC system, the catalyst of the ASC module (such as precious metal Pt/Pd) is used to catalytically oxidize the escaped ammonia into harmless nitrogen and water.
8. What factors affect the life of the catalyst?
Temperature: Too high a temperature (such as > 600℃) may cause the catalyst to sinter and deactivate;
Urea quality: Impurities in inferior urea (such as biuret) will contaminate the catalyst;
Sulfur content: Sulfur in fuel or urea will poison the catalyst and shorten its life. Generally, the life of SCR catalyst is 2-5 years, and SCR+ASC requires comprehensive maintenance to extend the overall life.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy