Catalyst Technologies for Gasoline Engines with Respect to CO
Besides the further reduction of the harmful gaseous emissions
(HC, CO and NOx) to reach upcoming emission limits, the discussion
on lowering the CO₂ emissions is omnipresent. From engine
development point of view further optimization of the
stoichiometric-operated gasoline engine as well as the introduction
of lean-operated engines are the main development trend.
The emission control system can support the engine development
by dedicated catalyst technologies as presented in this paper.
A new family of TWC technologies offers to tune the catalyst
system to the engine performance and the back pressure requirement
- which helps to reduce CO₂ emissions. In addition these
technologies show improved performance in HC, CO, NOx light-off,
and in CO and NOx conversions under dynamic conditions - this again
can positively impact the CO₂ emissions as less harsh heating
strategies for cold start is required.
By further optimization of the aftertreatment system with regard
to system integration (catalyst volume, precious metal
distribution, calibration) a considerable reduction in precious
metal is realized with improved overall performance when compared
to the current series applications.