Reducing NOx emissions

The EU is concerned about the level of NOx emissions in key parts of Europe and remains concerned that even if NOx Tier III requirements are being implemented in the Baltic and the North Sea in 2021, these will be too slow to take effect, as they only apply to new builds. There is a change of implementation of local or regional regulations for NOx emissions on top of existing Marpol requirements.

Compliance with NOX Tier III standards can be achieved by using a Marine Selective Catalytic Reduction (SCR) system.

Marine SCR (Selective Catalytic Reduction)

Selective Catalytic Reduction is a simple, low-cost means of converting nitrous oxides in the exhaust with the help of a catalyst into diatomic nitrogen and water. The utilization of marine SCR technology allows for achieving the IMO Tier III emissions limits.

Marine SCR Systems typically use a urea 40% solution, and can remove up to 99% of NOx emissions. SCR technology and infrastructure are well developed and have been employed for many years in a range of applications, including the reduction of NOx from power plants and generators.

SCR technology is the industry standard for removing NOx emissions from diesel truck engines and has been used in marine applications for around 30 years.

How does it work?

Small quantities of urea 40% solution are injected into the exhaust upstream of the catalytic converter. The hot exhaust vaporizes the urea solution into ammonia and carbon dioxide. The ammonia mixing in the catalytic converter converts the N0x into harmless nitrogen and water.

Our Contacts in Your Region

Carolyn O’Connor Marine Emissions Americas +1 (732) 841-9163

Nishant Bahl Marine Emissions EMEA +49 201 6496 1853

Jeremy Sim Marine Emissions Asia Pacific +65 6914 2187


Contact us today by completing the short form to find out more about our specialty chemical product line, or if you have a question about our marine emission solutions.

Carolyn O’Connor
Marine Emissions Americas
+1 (732) 841-9163


Brenntag has the capability to provide marine chemicals in different concentrations directly to your vessel or shore site.


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