CATALYTIC FILTER HAVING A SOOT CATALYST AND AN SCR CATALYST

摘要

A catalytic filter is provided having a mixture of an SCR catalyst and soot oxidation catalyst where the soot oxidation catalyst is a copper doped ceria, iron doped ceria or manganese doped ceria. The mixture of an SCR catalyst and soot oxidation catalyst provides for a lowering of the peak oxidation temperature for soot removal from the filter. The use of the filter allows for improved soot combustion and reduces the susceptibility of an SCR catalyst contained on a filter to deterioration. The soot oxidation catalyst also improves the resistance of the SCR catalyst to poisoning and subsequent deterioration of SCR performance.

主权项

1. A composition comprising a mixture of an SCR catalyst and a soot catalyst comprising copper doped ceria, iron doped ceria or manganese doped ceria, wherein the composition is formulated for application to a filter.