Rolls-Royce launches new exhaust after-treatment system for marine propulsion systems

• Unrestricted operation in IMO III emission-controlled zones with a new integrated exhaust after-treatment solution

• Rolls-Royce expands its propulsion system portfolio for offshore vessels, ferries, crew boats and patrol boats

1 September 2026

Rolls-Royce is launching a new exhaust gas after-treatment solution. It complies with the stringent IMO Tier III emission standards. This completes the company’s portfolio for the key mtu marine propulsion systems. The new system is being certified in collaboration with exhaust gas after-treatment specialist Eminox for Series 2000 mtu engines.


Rolls-Royce is launching a new exhaust gas after-treatment solution designed to meet the most stringent IMO Tier III emission standards, thereby completing its portfolio for all major mtu marine propulsion systems. The new system is being certified for the mtu Series 2000 in collaboration with Eminox, a specialist in exhaust after-treatment systems. The SCR system enables offshore supply vessels, ferries and patrol boats fitted with mtu Series 2000 engines to operate in emission-controlled areas.   Image by Rolls-Royce Group plc.

Exhaust gas after-treatment using selective catalytic reduction (SCR) enables offshore supply vessels, ferries and patrol boats fitted with engines from the mtu Series 2000 to operate in emission-regulated maritime areas. These include, amongst others, the North Sea and the Baltic Sea.

Dr Lukas Kohler, Senior Vice President Global Marine & Mining at Rolls-Royce Power Systems said:

"With this new offering, all models in the mtu Series 2000 are now available with integrated SCR systems. We have already launched a new, flexible and compact solution for the more powerful mtu Series 4000. This enables us to equip our customers with future-proof propulsion systems to meet the challenges of modern shipping"

The new integrated solution offers ship operators several advantages: it is designed for a service life of up to 16,000 operating hours, depending on the load profile. It requires no compressed air for dosing and can be flexibly integrated into various ship designs.

As with vehicle powertrains, an aqueous urea solution reacts with the nitrogen oxides in the exhaust gases and converts them into harmless substances. The SCR system reduces nitrogen oxide emissions by 75 per cent compared with the IMO II limits.

Rolls-Royce Group plc press release