DEF/NOx reduction

Stamicarbon offers technology concepts to produce 32.5% urea-in-solution - often known as AUS32 or DEF (Diesel Exhaust Fluid) - for NOx reduction in diesel engines". As a licensor of urea technology, Stamicarbon is in an ideal position to develop a state-of-the-art solution not only taking into account the current regulations but also anticipating future developments and requirements.

Although it seems easy to make such a solution without an in depth knowledge of the application it is used for, crucial and costly mistakes are easily made. Realizing this, Stamicarbon has thoroughly investigated all the requirements, evaluated the options and designed a cost effective solution for our customers ensuring, guaranteed, the highest quality product for now and for the future. Such a solution used for NOx reduction cannot be made by simply diluting or dissolving urea as it was thought originally. It has to be virtually free from everything but urea, which proves to be a challenge as most urea contains a certain concentration of free ammonia, biuret and formaldehyde.

This is often out of the required specification, and as such, prone to either damage or foul the expensive catalyst, used for NOx reduction. This is however not the only issue. Also the water added for dilution or the water formed while producing urea, contains an unwanted byproduct (corrosion or polymerization products) which is not acceptable for the market. Not every plant is directly suited to produce such a urea solution and as result of this, investments may well be much higher than originally anticipated. Stamicarbon designs will supply a reliable and high quality solution for the long term with lifetime support.

Download DEF/NOX reduction leaflet