Device For Purifying Exhaust Gases Of An Internal Combustion Engine

Abstract

A device for purifying exhaust gases of an internal combustion engine has a particle filter, which is provided with a catalytically active coating. The catalytically active coating includes a supporting material and an iron-containing material, which is joined to the supporting material and is present on at least the surface of the same. The supporting material is an aluminosilicate or a silicon oxide.

1 - 19 . (canceled)  
   
   
       20 . A device for purifying an exhaust gas of an internal combustion engine, comprising: 
 a particle filter provided with a catalytically active coating, the catalytically active coating having a supporting material and an iron-containing material that is joined to the supporting material and is at least present on the surface of the same, and the supporting material being an aluminosilicate or a silicon oxide.    
   
   
       21 . The device as recited in  claim 20 , wherein the supporting material is a zeolite.  
   
   
       22 . The device as recited in  claim 20 , wherein the supporting material is a silicon oxide, whose skeletal structure is of the type MCM41 or MCM48.  
   
   
       23 . The device as recited in  claim 20 , wherein the iron-containing material includes iron oxide.  
   
   
       24 . The device as recited in  claim 23 , wherein the iron-containing material is up to 100% iron oxide.  
   
   
       25 . The device as recited in  claim 20 , wherein the iron-containing material includes pure iron.  
   
   
       26 . The device as recited in  claim 25 , wherein the iron-containing material is up to 100% pure iron.  
   
   
       27 . The device as recited in  claim 20 , wherein the iron-containing material is joined to the supporting material by coating.  
   
   
       28 . The device as recited in  claim 20 , wherein the iron-containing material is applied to the supporting material by ion exchange.  
   
   
       29 . The device as recited in  claim 20 , wherein the catalytically active coating includes a noble metal.  
   
   
       30 . The device as recited in  claim 29 , wherein the noble metal is applied to the catalytically active coating as an additional layer.  
   
   
       31 . The device as recited in  claim 29 , wherein the noble metal is distributed in the catalytically active coating.  
   
   
       32 . The device as recited in  claim 29 , wherein the noble metal is platinum or palladium.  
   
   
       33 . The device as recited in  claim 21 , wherein the zeolite is a β-zeolite.  
   
   
       34 . The device as recited in  claim 20 , wherein the supporting material is joined to the particle filter with the aid of an adhesive agent.  
   
   
       35 . The device as recited in  claim 34 , wherein the adhesive agent includes silicon oxide, aluminum oxide, cerium oxide, zirconium oxide, or titanium oxide.  
   
   
       36 . The device as recited in  claim 20 , wherein the particle filter is made of ceramic or of metal, having a two-way duct system or an open system.  
   
   
       37 . An exhaust system for an internal combustion engine, comprising: 
 an exhaust pipe; and    a device situated in the exhaust pipe and for purifying an exhaust gas of an internal combustion engine, the device including:    a particle filter provided with a catalytically active coating, the catalytically active coating having a supporting material and an iron-containing material that is joined to the supporting material and is at least present on the surface of the same, and the supporting material being an aluminosilicate or a silicon oxide.    
   
   
       38 . The exhaust system as recited in  claim 37 , wherein the device is coupled to an upstream oxidation catalytic converter.