US2011076202A1PendingUtilityA1

Particulate combustion catalyst, particulate filter and exhaust gas purifying apparatus

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Assignee: MITSUI MINING & SMELTING COPriority: May 29, 2008Filed: Oct 23, 2008Published: Mar 31, 2011
Est. expiryMay 29, 2028(~1.8 yrs left)· nominal 20-yr term from priority
Inventors:Takahito AsanumaHiromitsu TakagiIsamu YashimaAkira Abe
B01D 53/944B01D 53/96F01N 2370/00B01D 2255/20715B01D 2255/9207B01D 2255/104B01D 2258/012F01N 3/035B01J 37/08B01D 39/2068B01J 21/066B01J 23/50B01D 53/94B01J 35/612B01J 35/613
53
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Claims

Abstract

Provided is a particulate combustion catalyst including a carrier formed of monoclinic zirconium oxide particles, and metallic Ag or Ag oxide, which serves as a catalyst component and is supported on the carrier, wherein the amount of the catalyst component is 0.5 to 10 mass %, as reduced to metallic Ag, on the basis of the mass of the carrier, and preferably, the catalyst has a BET specific surface area of 8 to 21 m 2 /g. Also provided are a particulate filter coated with the particulate combustion catalyst; and an exhaust gas cleaning apparatus including a particulate filter coated with the particulate combustion catalyst.

Claims

exact text as granted — not AI-modified
1 . A particulate combustion catalyst characterized by comprising a carrier formed of monoclinic zirconium oxide particles, and metallic Ag or Ag oxide, which serves as a catalyst component and is supported on the carrier, wherein the amount of the catalyst component is 0.5 to 10 mass %, as reduced to metallic Ag, on the basis of the mass of the carrier. 
     
     
         2 . A particulate combustion catalyst according to  claim 1 , which is produced through firing at 600 to 900° C. for 10 hours or longer. 
     
     
         3 . A particulate combustion catalyst according to  claim 1 , which has a BET specific surface area of 8 to 21 m 2 /g. 
     
     
         4 . A particulate combustion catalyst according to  claim 1 , which exhibits a combustion initiation temperature (Tig) of 300° C. or lower. 
     
     
         5 . A particulate combustion catalyst characterized by comprising a carrier formed of monoclinic zirconium oxide particles, and metallic Ag or Ag oxide, which serves as a catalyst component and is supported on the carrier, wherein the amount of the catalyst component is 1 to 9 mass %, as reduced to metallic Ag, on the basis of the mass of the carrier, and the catalyst has a BET specific surface area of 11 to 20 m 2 /g. 
     
     
         6 . A particulate combustion catalyst according to  claim 5 , which exhibits a combustion initiation temperature (Tig) of 260° C. or lower. 
     
     
         7 . A particulate combustion catalyst according to  claim 1 , which is produced through firing at 730 to 870° C. for 10 hours or longer. 
     
     
         8 . A particulate filter characterized by comprising a base coated with a particulate combustion catalyst as recited in  claim 1 . 
     
     
         9 . An exhaust gas cleaning apparatus characterized by comprising a particulate filter coated with a particulate combustion catalyst as recited in  claim 1 . 
     
     
         10 . A particulate combustion catalyst characterized by comprising a carrier formed of monoclinic zirconium oxide particles, and metallic Ag or Ag oxide, which serves as a catalyst component and is supported on the carrier, wherein the amount of the catalyst component is 0.5 to 10 mass %, as reduced to metallic Ag, on the basis of the mass of the carrier. 
     
     
         11 . A particulate combustion catalyst according to  claim 10 , which is produced through firing at 600 to 900° C. for 10 hours or longer. 
     
     
         12 . A particulate combustion catalyst according to  claim 10 , which has a BET specific surface area of 8 to 21 m 2 /g. 
     
     
         13 . A particulate combustion catalyst according to  claim 11 , which has a BET specific surface area of 8 to 21 m 2 /g. 
     
     
         14 . A particulate combustion catalyst according to  claim 10 , which exhibits a combustion initiation temperature (Tig) of 300° C. or lower. 
     
     
         15 . A particulate combustion catalyst according to  claim 13 , which exhibits a combustion initiation temperature (Tig) of 300° C. or lower. 
     
     
         16 . A particulate combustion catalyst characterized by comprising a carrier formed of monoclinic zirconium oxide particles, and metallic Ag or Ag oxide, which serves as a catalyst component and is supported on the carrier, wherein the amount of the catalyst component is 1 to 9 mass %, as reduced to metallic Ag, on the basis of the mass of the carrier, and the catalyst has a BET specific surface area of 11 to 20 m 2 /g. 
     
     
         17 . A particulate combustion catalyst according to  claim 16 , which exhibits a combustion initiation temperature (Tig) of 260° C. or lower. 
     
     
         18 . A particulate combustion catalyst according to  claim 10 , which is produced through firing at 730 to 870° C. for 10 hours or longer. 
     
     
         19 . A particulate combustion catalyst according to  claim 11 , which is produced through firing at 730 to 870° C. for 10 hours or longer. 
     
     
         20 . A particulate combustion catalyst according to  claim 12 , which is produced through firing at 730 to 870° C. for 10 hours or longer. 
     
     
         21 . A particulate combustion catalyst according to  claim 15 , which is produced through firing at 730 to 870° C. for 10 hours or longer. 
     
     
         22 . A particulate filter characterized by comprising a base coated with a particulate combustion catalyst as recited in  claim 10 . 
     
     
         23 . A particulate filter characterized by comprising a base coated with a particulate combustion catalyst as recited in  claim 11 . 
     
     
         24 . A particulate filter characterized by comprising a base coated with a particulate combustion catalyst as recited in  claim 12 . 
     
     
         25 . A particulate filter characterized by comprising a base coated with a particulate combustion catalyst as recited in  claim 15 . 
     
     
         26 . An exhaust gas cleaning apparatus characterized by comprising a particulate filter coated with a particulate combustion catalyst as recited in  claim 10 . 
     
     
         27 . An exhaust gas cleaning apparatus characterized by comprising a particulate filter coated with a particulate combustion catalyst as recited in  claim 11 . 
     
     
         28 . An exhaust gas cleaning apparatus characterized by comprising a particulate filter coated with a particulate combustion catalyst as recited in  claim 12 . 
     
     
         29 . An exhaust gas cleaning apparatus characterized by comprising a particulate filter coated with a particulate combustion catalyst as recited in  claim 15 .

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