Euro 4 5 6 Sdpf Catalyst POC DOC CDPF Scr Selective Catalytic Reduction In Diesel Engines Auto catalyst

All specifications in this diesel SCR catalyst series can be customized to meet the specific requirements of our partners. As an experienced emission control catalyst manufacturer, Hualian boasts advanced manufacturing capability and strict quality control, delivering diesel oxidation catalysts that fit seamlessly into your engine or system design. Our customization service ensures optimal performance, regulatory compliance, and reliable long-term operation, giving our partners a strong competitive advantage in emission control.

Specifications
Square honeycomb SCR w/ or w/o NH3-slip catalyst
---Cell desity:40/75/100/200/300 cpsi
---Size:150*150*100/150/200/250/300/400mm
Cylindrical honeycomb SCR w/ or w/o NH3-slip catalyst
---Cell desity: 300/400/600 cpsi
---Size:(ϕ143.8~330.2mm)*(101.6~177.8mm)
Customer customization

Main SCR Reaction Pathways:

Depending on the NO/NO2 content in the exhaust gas, two main SCR reactions are distinguished:

Without NO2: Standard SCR:

4 NH3+ 4 NO + O2 → 4 N2 + 6 H2O

With NO2: Fast SCR:

4 NH3+ 2 NO + 2 NO2 → 4 N2 + 6 H2O

As one of the leading SCR catalyst suppliers, our company has developed SCR catalysts for meeting NOx emission control in both mobile and stationary applications. Depending on the different application scenes, we can provide matched wash-coated catalyst for diesel engines, including Fe/zeolite (450~620 oC), Cu/Zeolite (190~550 oC), vanadium-based metal oxides (230~470 oC) and Mn-containing oxide catalysts (130~250 oC).

Low pressure drop: The honeycomb structure of our diesel SCR catalyst ensures low back pressure, reducing fuel consumption and helping engines maintain higher efficiency under heavy loads.

High surface area:A large contact surface of the NOx reduction catalyst increases reaction activity, leading to higher NOx conversion efficiency and more stable emission reduction.

Good consistency water absorption: Stable water absorption prevents uneven catalyst coating and ensures reliable performance in humid or variable conditions, reducing maintenance risks.

Low thermal expansion coefficient: The ceramic substrate material shows minimal deformation during temperature changes, which prevents cracking and prolongs the service life of the catalyst.

Good heat shock resistance and heat vibration resistance: Our selective catalytic reduction catalyst exhibits strong resistance to sudden temperature shifts and vibration, enabling the catalyst to operate reliably in harsh engine environments and reducing replacement costs.

Ideal matching with various active catalyst components: Our diesel SCR catalyst is compatible with different catalyst formulations such as Cu-zeolite, Fe-zeolite, or V-based systems, enabling flexible solutions for a wide range of temperature windows and emission standards.

As the leading SCR catalyst suppliers with industry experience of over 20 years, our diesel SCR catalysts are engineered to meet the stringent NOx emission standards across various diesel engine applications. Designed for both mobile and stationary systems, our selective catalytic reduction catalyst effectively reduces nitrogen oxides (NOx) in diesel exhaust, ensuring compliance with Euro IV, V, and VI regulations.

Heavy-Duty Diesel Engines

The SCR emission control catalyst is ideal for long-haul trucks, buses, and construction machinery. It enhances engine performance by enabling optimized combustion and reducing NOx emissions. This results in improved fuel efficiency and extended engine life.

Marine Diesel Engines

The catalyst is suitable for marine diesel engines, offering reliable NOx reduction even under varying operational conditions. They contribute to meeting international maritime emission standards and reducing environmental impact.

Stationary Diesel Power Generators

For stationary power generation units, our diesel SCR catalyst minimizes NOx emissions, supporting compliance with local environmental regulations and promoting sustainable energy production.

Industrial Diesel Equipment

In industrial applications, including mining and agriculture, our SCR catalysts provide effective emission control, enhancing equipment reliability and reducing operational costs.

With customizable sizes and configurations, our diesel oxidation catalyst for sale is adaptable to a wide range of diesel engine systems, offering tailored solutions to meet specific emission control requirements.

Can an SCR catalyst be cleaned?

The diesel SCR catalyst is sensitive to physical damage and contamination. Minor deposits can sometimes be removed using gentle back-flushing or air cleaning, but aggressive cleaning may damage the catalyst coating. In most cases, proper engine maintenance and the use of high-quality urea/DEF prevent fouling and extend catalyst life.

How does SCR catalyst work?

The NOx reduction catalyst converts harmful nitrogen oxides (NOx) in diesel exhaust into harmless nitrogen (N₂) and water (H₂O). It does this by reacting NOx with a reductant, usually ammonia (NH₃) or urea, on the catalyst surface. The reaction efficiency depends on exhaust temperature and NO/NO₂ ratio.

What does the SCR catalyst do?

The aftertreatment diesel oxidation catalyst reduces NOx emissions from diesel engines, enabling vehicles and machinery to meet stringent environmental standards. By converting NOx to nitrogen and water, it protects the environment and ensures compliance with Euro IV, V, and VI regulations.

What is a SCR catalyst?  

A SCR (Selective Catalytic Reduction) catalyst is a device installed in diesel exhaust systems to reduce nitrogen oxide emissions. It consists of a honeycomb substrate coated with active catalyst materials that enable chemical reactions between NOx and a reductant.

What is SCR catalyst made of?

The SCR catalysts usually consist of a ceramic honeycomb substrate, commonly made of cordierite, coated with active materials such as vanadium, tungsten, iron, or copper zeolites. The substrate provides structural stability, while the coating enables the chemical reactions that convert NOx into nitrogen and water.