US2012090299A1PendingUtilityA1

Method to reduce the ignition temperature of soot being accumulated on a particulate trap

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Assignee: MARGRAF JANPriority: Oct 13, 2010Filed: Oct 12, 2011Published: Apr 19, 2012
Est. expiryOct 13, 2030(~4.2 yrs left)· nominal 20-yr term from priority
Inventors:Jan MargrafKlaus SchreweSimon Steigert
F01N 2610/01F01N 2610/12F01N 2610/08Y02T10/40F01N 9/002F01N 2610/06F01N 3/0293F01N 2610/1453
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Claims

Abstract

A method for lowering the ignition temperature of soot accumulated on a particulate filter 2 installed in exhaust tract 1 of an internal combustion engine is described. In this method, a precursor of a catalyst which lowers the oxidation temperature of soot is introduced into exhaust tract 1 downstream from the internal combustion engine and upstream from particulate filter 2 . The precursor introduced into exhaust tract 1 is converted to its gaseous phase within exhaust tract 1 prior to contacting the soot accumulated on particulate filter 2 . The gaseous catalyst precursor is adsorbed by the soot accumulated on particulate filter 2 . Subsequently the catalyst responsible for lowering the ignition temperature is formed from the gaseous precursor in a reaction with at least one other component contained in the exhaust gas flow.

Claims

exact text as granted — not AI-modified
1 . A method for lowering the ignition temperature of soot accumulated in a particulate filter installed in an exhaust tract of an internal combustion engine comprising:
 providing a precursor of a catalyst, said catalyst functioning to lower an ignition temperature of the soot;   introducing the catalyst into the exhaust tract downstream from the internal combustion engine and upstream from the particulate filter;   wherein the precursor introduced into the exhaust gas tract is converted within the exhaust gas tract into its gaseous phase before it contacts the soot accumulated on the particulate filter;   said gaseous catalyst precursor being absorbed by the soot accumulated on the particulate filter; and   said catalyst precursor forming the catalyst responsible for lowering the ignition temperature in a reaction with at least one other gaseous component contained in the exhaust gas flow.   
     
     
         2 . The method as recited in  claim 1 , wherein an oxide is used as the catalyst, which is formed from the gaseous precursor and the oxygen contained in the exhaust gas flow. 
     
     
         3 . The method as recited in  claim 1  wherein to convert the precursor installed in the exhaust tract into its gaseous phase, the precursor is entrained in the exhaust gas flow over a certain dwell time. 
     
     
         4 . The method as recited in  claim 2  wherein to convert the precursor installed in the exhaust tract into its gaseous phase, the precursor is entrained in the exhaust gas flow over a certain dwell time. 
     
     
         5 . The method as recited in  claim 1  wherein a material whose vapor pressure favors a change of the aggregate state into the gaseous phase is introduced into the exhaust tract as precursor. 
     
     
         6 . The method as recited in  claim 2  wherein a material whose vapor pressure favors a change of the aggregate state into the gaseous phase is introduced into the exhaust tract as precursor. 
     
     
         7 . The method as recited in  claim 3  wherein a material whose vapor pressure favors a change of the aggregate state into the gaseous phase is introduced into the exhaust tract as precursor. 
     
     
         8 . The method as recited in  claim 4  wherein a material whose vapor pressure favors a change of the aggregate state into the gaseous phase is introduced into the exhaust tract as precursor. 
     
     
         9 . The method as recited in  claim 1  wherein the precursor is introduced into the exhaust tract in a dissolved form or a gaseous form. 
     
     
         10 . The method as recited in  claims 2  wherein the precursor is introduced into the exhaust tract in a dissolved form or a gaseous form. 
     
     
         11 . The method as recited in  claims 5  wherein the precursor is introduced into the exhaust tract ( 1 ) in a dissolved form or a gaseous form. 
     
     
         12 . The method as recited in  claim 7  wherein the precursor is introduced into the exhaust tract ( 1 ) in a dissolved form or a gaseous form. 
     
     
         13 . The method as recited in  claim 1  wherein the precursor is introduced into the exhaust tract as dissolved or gaseous ferrocene. 
     
     
         14 . The method as recited in one of  claim 3 , wherein the precursor is introduced into the exhaust tract as dissolved or gaseous ferrocene. 
     
     
         15 . The method as recited in  claim 5 , wherein the precursor is introduced into the exhaust tract as dissolved or gaseous ferrocene. 
     
     
         16 . The method as recited in  claim 1  wherein the method is carried out within the scope of a regeneration of the particulate filter with sufficient advance timing before an intended regeneration so that the catalyst may form from the precursor and another gaseous component in the exhaust gas flow. 
     
     
         17 . The method as recited in  claim 2  wherein the method is carried out within the scope of a regeneration of the particulate filter with sufficient advance timing before an intended regeneration so that the catalyst may form from the precursor and another gaseous component in the exhaust gas flow. 
     
     
         18 . The method as recited in  claim 16 , wherein the mixing-in of the precursor is terminated before the regeneration process is started or triggered

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