White smoke reduction system for diesel vehicle

Abstract

A white smoke reduction system for a diesel vehicle reduces white smoke generated from a diesel vehicle. The white smoke reduction system includes a diesel oxidation catalyst (DOC) mounted on an exhaust line connected to an engine to oxidize exhaust gas through a catalyst. A filter module is connected to a rear end of the DOC to collect particulate matter contained in the exhaust gas and is coated with a ceria (CeO 2 ) ingredient such that sulfur oxide is separated at a temperature equal to or more than 600° C.

What is claimed is: 
     
         1 . A white smoke reduction system for a diesel vehicle, which reduces white smoke generated from a diesel vehicle, the system comprising:
 a diesel oxidation catalyst (DOC) mounted on an exhaust line connected to an engine to oxidize exhaust gas through a catalyst; and   a filter module connected to a rear end of the DOC to collect particulate matter contained in the exhaust gas, the filter module being coated with a ceria (CeO 2 ) ingredient such that sulfur oxide is separated at a temperature equal to or more than 600° C.   
     
     
         2 . The white smoke reduction system of  claim 1 , wherein:
 the filer module is a diesel particulate filter (DPF) connected to the rear end of the DOC; and   the DPF is coated with the ceria ingredient.   
     
     
         3 . The white smoke reduction system of  claim 1 , wherein:
 the filer module comprises a DPF connected to the rear end of the DOC and a white smoke reduction catalyst connected to a rear end of the DPF; and   the white smoke reduction catalyst includes a carrier through which the exhaust gas passes, the carrier being coated with the ceria ingredient.   
     
     
         4 . The white smoke reduction system of  claim 2 , wherein a coating amount of the ceria ingredient is 10% or more of an amount of a coating material coated on the DOC. 
     
     
         5 . The white smoke reduction system of  claim 4 , wherein platinum (Pt) is contained in the coating material coated on the DOC. 
     
     
         6 . The white smoke reduction system of  claim 4 , wherein the coating material coated on the DOC comprises alumina (Al 2 O 3 ) and zeolite, and a coating amount of the ceria ingredient is 50% or more of the amount of the coating material coated on the DOC. 
     
     
         7 . The white smoke reduction system of  claim 3 , wherein a coating amount of the ceria ingredient is 10% or more of an amount of a coating material coated on the DOC. 
     
     
         8 . The white smoke reduction system of  claim 2 , wherein the DPF includes a plurality of porous partition walls and collects the particulate matter passing through the DOC.