An optimal NOx assisted abatement of diesel soot in an advanced catalytic filter design

Two standard soot catalytic filter configurations and a so-called TU Delft (TUD) catalytic filter have been investigated in laboratory equipment to evaluate its potential as diesel soot exhaust catalytic filter. The first configuration, where Pt/SiC foam catalyst was placed upstream of soot loaded on SiC foam, showed the lowest NO2-slip and the lowest soot oxidation rate. In the second configuration, soot was loaded on Pt/SiC foam. This gives rise to a higher soot oxidation rate at the expense of a higher NO2-slip. An improvement on the utilisation of NO2 with lower NO2-slip has been observed in the TUD catalytic filter in addition with the highest soot oxidation rate. As with all diesel particulates filter TUD catalytic filter up to 10% CO (around 50 ppm) is. formed as soot combustion product, whereas for the miniaturisation of the commercially available continuously regeneration trap (CRT) system at the same diesel soot oxidation rate 120-140 ppm CO is observed. Calculations to assess the potential application of the system showed that the system is promising. (C) 2002 Elsevier Science B.V. All rights reserved.