Comparison of Different Diesel Particulate Filters

The present investigation concerns the development of a catalytic wall-flow trap for the simultaneous removal of particulate, CO and marginally for NO _x . Three different geometries (200/17, 300/12, and 300/12-HAC) of commercial SiC filters were catalyzed with a nanostructured perovskite catalyst (La–K–Cu–FeO₃ + 2%Au) via the in situ Solution Combustion Synthesis method, and tested on real diesel exhaust gases on a commercial vehicle engine bench. The pros and cons of all the filters were evaluated on the ground of numerous loading and regeneration cycles. In all filter geometries tested, the La–K–Cu–FeO₃ + 2%Au catalyst entails a much more complete regeneration and lower fuel penalties compared to those of a non catalytic trap.