Evaluation of Advanced Diesel Oxidation Catalyst Concepts: Part 2

The development of diesel powered passenger cars is driven by the enhanced emission legislation. To fulfill the future emission limits there is a need for advanced aftertreatment devices. A comprehensive study was carried out focusing on the improvement of the DOC as one part of these systems, concerning high HC/CO conversion rates, low temperature light-off behaviour and high temperature aging stability, respectively. The first part of this study was published in [1].

Further evaluations using a high temperature DPF aging were carried out for the introduced systems. Again the substrate geometry and the catalytic coating were varied. The results from engine as well as vehicle tests show advantages in a highly systematic context by changing either geometrical or chemical factors. These results enable further improvement for the design of the exhaust system to pass the demanding emission legislation for high performance diesel powered passenger cars.

Introduction of a DOC technology with partial exchange of Pt by Pd in the catalytic coating gives additional advantages with respect to stability of the system and cost reduction. The evaluation of real world aged systems as well as possibilities of simulated aging/testing procedures will offer a “state of the art” interpretation.