MPAT system

Marine Propulsion After Treatment for ultra-low sulphur fuel (EN590)

This system has been specifically developed for application on inland navigation vessels, but can also be used with regard to other engines that run on ultra-low sulphur fuel.

The MPAT system is an all-in-one combination of SCR DeNox and a DPF (diesel particulate filter) system with all related components. The system replaces a standard silencer and with a sound attenuation between 40 and 45 dB(A) as standard.



The MPAT system can be supplied as a compact or an in-line model. The compact model will usually fit at the location of an (existing) silencer, but is wider than a standard silencer. If this will not fit, an in-line configuration can be supplied.

A customised solution, of course, is possible for very narrow/complex engine rooms.

The system can be supplied in the following phases so that you can spread your investment costs:

  1. MPAT unit with dummy elements for SCR and diesel particulate filters.
    This option can be installed instead of a silencer and is only in preparation.
  2. MPAT-SCR prepared for later installation of diesel particulate filters.
    When compared to (1), here the SCR system has been installed including SCR catalyst, an injector, a pump and dosing set and a controller. Dummy blocks have been installed at the location of the diesel particulate filters.  
  3. MPAT-SCR+DPF prepared for active regeneration.
    When compared to (2), here the oxidation catalyst and diesel particulate filters have been installed, but without active regeneration. This is only possible with regard to specific engine types and sailing profiles where the average exhaust gas temperature is sufficiently high.
  4. MPAT-SCR+DPF+AR, full system.
    This is the MPAT system in the most extensive model with an SCR system and diesel particulate filter including active regeneration. The diesel particulate filters can regenerate with regard to every sailing profile.


MPAT Compact System overview


MPAT In-Line system overview


Examples of deliverable options are:

  • Stainless steel unit
  • Intake and exhaust at alternative positions
  • Deviating diesel particulate filter or SCR catalyst types for special sailing profiles or engine models
  • Engine load signal analogue instead of J1939
  • External communication through Mod or CAN bus.

SCR system

Xeamos SCR systems operate using urea solution to reduce harmful nitrogen oxides (NOx). Reductions of more than 95% are possible. Xeamos SCR systems work with reliable compressed air atomizing and are suitable for a 32.5% (Ad-blue of AUS32) or 40% (AUS40) urea solution.

More information can be found on the Tech Talk page.


Diesel particulate filter system

The diesel particulate filters of the MPAT system work in combination with a Diesel Oxidation Catalyst or DOC. It provides a partial conversion of nitrogen monoxide to nitrogen dioxide. Nitrogen dioxide ensures that particulate matter caught in the diesel particulate filter is converted into harmless carbon dioxide and nitrogen. The advantage of this proven regeneration method is that it already takes place at a relatively low temperature. We use diesel particulate filters without a catalytic coating that have a very long service life within this context. This means that the operating costs of our systems are lower than systems with catalytically coated diesel particulate filters.

We will be more than happy to make a calculation for you of the expected costs in the long term.

If the engine runs regularly and for longer periods at a low load, the SFB burner system ensures that the exhaust gases are regularly heated so that the diesel particulate filter stays clean. We will gladly offer advice when this is required.

More information can be found on the Tech Talk page.


Achievable emission reductions

Nitrogen oxides NOx up to 95%*
Hydrocarbons HC up to 90%
Carbon monoxide CO  up to 90% 
Fine dust or particulates  PM10  >95% 
Noise    40-45 dB(A) 

 * The future NOx value for the EU Stage V standard for inland navigation amounts to at most 1.8 g/kWh. In practice, this value is achieved at a reduction of 60-85% depending on the engine type and year of construction.

More information on emission technology can be found on the Tech Talk page


MPAT diagram



Contact Xeamos for more information about this system.