Particle filter having a catalytically active coating to accelerate burning off accumulated soot particles during a regeneration phase

Abstract

The present invention is directed to a particle filter to remove soot from the exhaust gas of a diesel engine. The particle filter contains a catalytically active coating on a filter body to accelerate burn-off during a regeneration phase of the soot particles collected on the filter. The particle filter comprises a catalytic coating containing compounds of barium, compounds of magnesium, and at least one element of the platinum group metals. The invention is further directed to a process for accelerated combustion of soot particles collected on the filter from lean exhaust gas of a diesel engine in which the soot particles have a soot ignition temperature and the particle filter is actively regenerated from time to time by raising the temperature of the particle filter above the soot ignition temperature and burning off the soot particles.

1 - 10 . (canceled)  
   
   
       11 . A process for accelerated combustion of soot particles collected on a particle filter from lean exhaust gas from combustion engines, wherein said process comprises regenerating a particle filter by raising the temperature of the particle filter above the soot ignition temperature and burning off the soot particles, wherein the particle filter has a catalytic coating comprising compounds of barium, compounds of magnesium and at least one element of the platinum group.  
   
   
       12 . The process of  claim 11 , wherein the raising of the temperature of the filter above the soot ignition temperature is accomplished by post-injection of diesel fuel into the engine.  
   
   
       13 . The process of  claim 12 , further comprising burning post-injection diesel fuel on a diesel oxidation catalyst that is positioned upstream of the filter.