CATALYTIC ACTIVE PARTICLE FILTER
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- UMICORE AG & CO KG
- Filing Date
- 2017-12-19
- Publication Date
- 2026-06-11
AI Technical Summary
There is a need for catalytically active particulate filters that can effectively remove particles, carbon monoxide, hydrocarbons, and nitrogen oxides from the exhaust gas of combustion engines operating with a stoichiometric air/fuel mixture, while meeting stringent emission standards such as EU-6c, which traditional three-way catalytic converters and wall-flow filters are inadequate for.
A particulate filter design incorporating a wall flow filter with two distinct catalytic coatings, Y and Z, each containing precious metals and oxygen storage components, applied differently along the length of the filter to enhance catalytic activity and compliance with emission standards, particularly using coatings with cerium/zirconium/rare earth metal mixed oxides and specific precious metal ratios.
The filter achieves improved removal of particles, carbon monoxide, and nitrogen oxides, demonstrating enhanced start-up behavior and dynamic conversion efficiency, meeting future emission limits and outperforming comparative designs.