BASF will introduce its innovative LNT+CS4F emissions control system for diesel engines at the International Vienna Motor Symposium, 8-9 May 2014 in Vienna, Austria. The new system combines the features of a Lean NOx Trap (LNT) and a multifunctional catalyzed soot filter (CS4F).
The LNT+CS4F can remove PM (Particulate Matter), as well as CO (Carbon Monoxide), HC (Hydrocarbons) and NOx (Nitrogen Oxides) from diesel-engine exhaust, helping automakers meet strict new emissions regulations including Euro 6c.
|Euro 6 (like Euro 5) is being introduced in three stages. The first stage (Euro 6a) was voluntary and enabled vehicles to be introduced with Euro 6 type approval, earlier than required, but without the new particulate measurement procedure. Euro 6a requires Euro 6 emissions excluding the revised measurement procedure for particulates, the particle number standard and the flexible fuel vehicle low temperature emission testing with biofuel.|
|Euro 6b allows positive ignition (PI) engined vehicles, only, to continue being type approved to Euro 6 without the new particulate measurement procedure, after the deadline for completion of Euro 6a. Euro 6b requires Euro 6 emissions including the revised measurement procedure for particulates, the particle number standard for CI vehicles and the flexible fuel vehicle low temperature emission testing with biofuel.|
|Euro 6c is the full Euro 6 emissions standard, ie. Euro 6b plus the particle number standard for PIDI (direct injection positive ignition) vehicles.|
|For diesel (compression ignition) passenger cars, the Euro 6c NOx maximum is 80 mg/km (128 mg/mile).|
To meet NOx emission limits under these demanding conditions, LNT catalysts for Euro 6c must have fast NOx adsorption kinetics and high NOx adsorption capacity when compared with LNT technologies developed for Euro 6a applications.
A multifunctional catalyzed soot filter (CS4F) is also required to remove PM plus convert secondary emissions like ammonia (NH3), hydrogen sulfide (H2S), CO, and HC resulting from soot filter and LNT regeneration, and to remove additional NOx, increasing the NOx reduction activity of the overall system.
Compared to the LNT+CSF+UF-SCR (Under Floor–Selective Catalytic Reduction) catalyst system already in the market, the LNT+CS4F system eliminates one catalytic component, resulting in lower system weight, space and complexity.
However, a filter with high porosity is required to incorporate all these functions, and the component must be carefully designed so that it also meets the particle number regulation. In addition, the exhaust backpressure should not increase when changing from the LNT+CSF+UF-SCR system to the two-component LNT+CS4F system.
The LNT+CS4F system will be showcased in a presentation led by Dr. Klaus Harth, BASF’s Vice President, Environmental Catalysis Research
The combination of newly developed NOx storage materials with tailored precious metal particles led to this improved LNT technology for Euro 6c legislation. In addition, the development of the new CS4F multifunctional catalyzed soot filter was required to further enhance the emissions reduction performance for diesel passenger car applications.—Dr. Harth. “
Euro 6 legislation will be implemented in 2014. This legislation requires a significant decrease of NOx emissions to less than 80 mg/km when evaluated under the New European Driving Cycle (NEDC). With the implementation of Euro 6c in 2017, still tighter requirements will come into play. Real Driving Emission (RDE) requirements will be applied, and will be evaluated using PEMS (Portable Emission Measurement Systems). These new conditions will lead to new challenges for the aftertreatment systems.
Beyond emissions catalysts, BASF will also showcase its fuel additives, synthetic lubricants for axles and transmissions, engineering plastics and battery materials at the 2014 Vienna Motor Symposium.