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NOx emissions – the major problem with diesel engines
Diesel trucks are renowned for their high towing capacity, durability over long distances, and fuel efficiency. However, these advantages come with high emissions, particularly NOx (Nitrogen Oxides). These gases can cause acid rain, air pollution, and directly impact human health, especially in densely populated urban areas.
Given the increasingly serious pollution situation, international emission standards – from Euro 4, Euro 5 to Euro 6 – require vehicles to reduce NOx emissions to extremely low levels. For long-haul trucks, meeting emission standards is no longer an option but a mandatory requirement for registration and legal operation.
Urea water – the key to SCR systems.
How does the SCR system operate?
To reduce NOx emissions, many newer trucks are equipped with SCR (Selective Catalytic Reduction) systems. This is an advanced exhaust gas treatment technology that uses chemical reactions to convert toxic gases into harmless substances. In this mechanism, urea plays a crucial role.
When injected into hot exhaust gases, the urea solution decomposes to produce ammonia (NH₃). The ammonia then reacts with NOx, converting it into nitrogen (N₂) and water vapor (H₂O), which is completely environmentally safe. Thanks to this mechanism, the SCR system can reduce NOx emissions by up to 80–90%, helping trucks meet Euro standards while maintaining operational efficiency.
Why can't trucks skip urea?
Modern trucks, especially those carrying heavy loads, operate continuously on long routes. Without urea, the SCR system becomes almost useless. Sensors will constantly report errors, and some vehicles may even reduce power or limit speed to protect the engine.
Furthermore, not using a standard solution can cause the SCR catalytic converter to fail prematurely, nozzles to become clogged, and NOx sensors to malfunction. The cost of repairing or replacing these parts is often many times higher than using standard urea solution from the start.
This shows that, for trucks, urea solution is not an option but a mandatory operating requirement.
Urea water and AdBlue – key points to understand.
Many people confuse urea water with AdBlue. Essentially, AdBlue® is the trade name for a urea water solution that meets European standards. All AdBlue products are urea water, but not all urea water is AdBlue.
Many commercially available solutions, whether adulterated or diluted, are ineffective in SCR systems and can damage sensors or catalysts. Therefore, drivers and transport companies need to choose solutions that meet ISO 22241 standards, ensuring the correct urea content, clean deionized water, and no metal impurities.
See more: Products Urea meet standards
- The benefits of urea water for trucks
Using standard urea water offers many practical benefits. First, it reduces NOx emissions, helping vehicles meet Euro standards and be permitted to circulate. At the same time, it ensures stable operation of the SCR system, accurate NOx sensing, smooth engine operation, reduced smoke, and improved fuel efficiency.
These benefits not only have a technical impact but also indirectly reduce maintenance costs, extend the lifespan of catalysts and sensors, and reduce the risk of penalties for violating emission standards.
- Risks of using low-quality solutions
Using substandard urea can cause serious problems. Metal impurities in poor-quality solutions can cause deposits in fuel injectors, damage the SCR catalytic converter, cause NOx sensor malfunctions, and reduce engine performance. In severe cases, the vehicle may experience reduced power, continuous DEF error messages, and require repairs, disrupting operation.
In reality, transport businesses that use unregulated urea will incur high maintenance and replacement costs for SCR components, whereas investing in a standard solution from the start can completely avoid this risk.
- Effective storage and use of urea water.
For urea solution to be effective, it needs to be stored properly. The solution must be kept at room temperature, away from direct sunlight and dusty environments. When pouring it into a container, use a clean funnel and do not dilute it with regular water.
Additionally, regularly checking the urea level in the truck helps ensure the SCR system is always operating optimally, preventing error messages or power reductions while on the road.
Urea water – the foundation for sustainable transportation.
With the development of stringent environmental standards, urea water has become a mandatory element for trucks to operate legally and sustainably. It not only helps reduce NOx emissions but also guarantees performance, durability, and long-term operating costs.
The SCR system combined with urea water demonstrates that clean technology and high efficiency can go hand in hand, laying the foundation for a green transportation industry, minimizing pollution, and meeting increasingly stringent international requirements.
Buy: Exhaust gas treatment solution for Euro 4, 5, and 6 diesel engines.
