US2005197244A1PendingUtilityA1

Exhaust treatment system and catalyst system

33
Priority: Mar 5, 2004Filed: Mar 5, 2004Published: Sep 8, 2005
Est. expiryMar 5, 2024(expired)· nominal 20-yr term from priority
Inventors:Moroz L'VovichKarl KharasMikhail Yurievich SmirnovBobrin AlexanderValerii Ivanovich Bukhtlyarov
B01D 2257/502B01D 53/945B01J 23/40B01D 53/944B01D 2257/702Y02T10/12B01J 37/0246B01J 23/56B01J 29/7415B01D 2255/106B01J 23/52B01D 2255/912B01J 35/19
33
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Claims

Abstract

A catalyst system comprises a gold catalyst capable of oxidizing CO; a hydrocarbon oxidation catalyst; and a hydrocarbon adsorbing material.

Claims

exact text as granted — not AI-modified
1 . A catalyst system comprising: 
 a gold catalyst capable of oxidizing CO;    a hydrocarbon oxidation catalyst; and    a hydrocarbon adsorbing material.    
     
     
         2 . The catalyst system of  claim 1 , wherein the gold catalyst, the hydrocarbon oxidation catalyst, and the hydrocarbon adsorbing material are in a physical mixture.  
     
     
         3 . The catalyst system of  claim 1 , wherein the hydrocarbon oxidation catalyst; and the hydrocarbon adsorbing material are disposed upstream of the gold catalyst.  
     
     
         4 . The catalyst system of  claim 1 , wherein a first substrate comprises the gold catalyst, the hydrocarbon oxidation catalyst, and the hydrocarbon adsorbing material disposed thereon; and a second substrate located upstream of the first substrate comprises the hydrocarbon oxidation catalyst, and the hydrocarbon adsorbing material disposed thereon.  
     
     
         5 . The catalyst system of  claim 1 , further comprising a support material disposed on a substrate, wherein the gold catalyst and the hydrocarbon catalyst are disposed on the support material.  
     
     
         6 . The catalyst system of  claim 5 , wherein the support material is an alumina selected from the group consisting of the gamma alumina, delta alumina, and theta alumina.  
     
     
         7 . The catalyst system of  claim 1 , wherein the gold catalyst has a gold particle size less than or equal to about 10 nm.  
     
     
         8 . The catalyst system of  claim 7 , wherein the gold particle size is less than or equal to about 7 nm.  
     
     
         9 . The catalyst system of  claim 8 , wherein the gold particle size is less than or equal to about 4 nm.  
     
     
         10 . The catalyst system of  claim 1 , wherein the hydrocarbon oxidation catalyst is platinum or palladium, and the adsorption material is selected from the group consisting of beta zeolite, ultra-stable Y zeolite and UTD-1 zeolite.  
     
     
         11 . The catalyst system of  claim 1 , wherein a ratio of a gold catalyst volume to a hydrocarbon oxidation volume is greater than or equal to about 1:12.5.  
     
     
         12 . The catalyst system of  claim 1 , wherein the gold catalyst is capable of converting greater than or equal to 50% CO present in an exhaust stream to CO 2  at temperatures less than or equal to about 100° C. in an atmosphere comprising a hydrocarbon at a space velocity less than or equal to 250,000 hr −1 .  
     
     
         13 . The catalyst system of  claim 12 , wherein the space velocity is less than or equal to about 37,000 hr −1 .  
     
     
         14 . The catalyst system of  claim 13 , wherein the space velocity is less than or equal to about 25,000 hr −1 .  
     
     
         15 . The catalyst system of  claim 1 , wherein the catalyst system is used in an exhaust treatment system.  
     
     
         16 . The catalyst system of  claim 1 , wherein the catalyst system is used in air purification system for a household use.  
     
     
         17 . A method of using a catalyst system comprising: 
 passing an exhaust stream over a catalyst system comprising a gold catalyst capable of oxidizing CO, a hydrocarbon oxidation catalyst; and a hydrocarbon adsorbing material; and    oxidizing at least a portion of CO present in the exhaust stream.    
     
     
         18 . The method of  claim 17 , wherein the gold catalyst, the hydrocarbon oxidation catalyst, and the hydrocarbon adsorbing material are in a physical mixture.  
     
     
         19 . The method of  claim 17 , wherein the hydrocarbon oxidation catalyst; and the hydrocarbon adsorbing material are disposed upstream of the gold catalyst.  
     
     
         20 . The method of  claim 17 , wherein a first substrate comprises the gold catalyst, the hydrocarbon oxidation catalyst, and the hydrocarbon adsorbing material disposed thereon; and a second substrate located upstream of the first substrate comprises the hydrocarbon oxidation catalyst, and the hydrocarbon adsorbing material disposed thereon.  
     
     
         21 . The method of  claim 17 , wherein greater than or equal to 50% CO in the exhaust stream is converted to CO 2  at a space velocity less than or equal to 250,000 hr −1  at a temperature less than or equal to about 100° C.  
     
     
         22 . The catalyst system of  claim 21 , wherein the space velocity is less than or equal to about 37,000 hr −1 .  
     
     
         23 . The catalyst system of  claim 22 , wherein the space velocity is less than or equal to about 25,000 hr −1 .

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