Method for the preparation of a catalysed particulate filter and catalysed particulate filter

Abstract

A catalysed particulate filter coated with a wash coat on its dispersion side and its permeate side and within partition walls of the filter. The wash coat contains a first catalyst active in burning off soot, together with a second catalyst active in a selective catalytic reduction of nitrogen oxides.

What is claimed is: 
     
         10 . A catalysed particulate filter coated with a wash coat on its dispersion side and its permeate side and within partition walls of the filter, said wash coat containing a first catalyst active in burning off of soot, together with a second catalyst active in a selective catalytic reduction of nitrogen oxides. 
     
     
         11 . The catalysed particulate filter of  claim 10 , wherein the filter is in form of a wall flow monolith with a plurality of longitudinally extending passages formed by longitudinally extending walls bounding and defining flow passages, the dispersion side of the passages have an open inlet end and a closed outlet end, and the permeate side of the passages have a closed inlet end and an open outlet end. 
     
     
         11 . The catalysed particulate filter of  claim 10 , wherein the first and second catalyst in the wash coat suspension have a particle size smaller than the mean pore size of the filter walls. 
     
     
         12 . The catalysed particulate filter of  claim 10 , wherein the first or the second catalyst in the wash coat suspension has a particle size equal to or larger than the mean pore size of the filter walls.