Catalyst for oxidizing carbon monoxide and method of manufacturing the same

Abstract

A catalyst that oxidizes carbon monoxide includes a bimetal consisting of platinum and a transition metal in a bimetallic phase that is loaded on γ-alumina support. The catalyst is manufactured by uniformly mixing a platinum precursor, a transition metal precursor, and γ-alumina (γ-Al 2 O 3 ) in a dispersion medium to provide a mixture; drying the mixture; calcining the dried mixture; and reducing the calcined dried mixture. Since the catalyst that oxidizes carbon monoxide has high reaction activity even at low temperature and excellent reaction selectivity, and a methanation reaction and reoxidization do not occur, and the catalyst can effectively eliminate carbon monoxide in the fuel.

1 . A catalyst that oxidizes carbon monoxide, comprising a bimetal consisting of platinum (Pt) and a transition metal other than platinum in a bimetallic phase, wherein the bimetal is loaded on a γ-alumina (γ-Al 2 O 3 ) support, and wherein the transition metal of the bimetal is reduced.  
     
     
         2 . The catalyst of  claim 1 , wherein the catalyst has a peak between 130 to 180° C. in a temperature programmed reduction (TPR) analysis and is not reoxidized until the temperature reaches 500° C. in a temperature programmed oxidation (TPO) analysis.  
     
     
         3 . The catalyst of  claim 1 , wherein the transition metal is selected from the group consisting of Ni, Co, Cu, and Fe.  
     
     
         4 . The catalyst of  claim 1 , wherein the atomic ratio of the transition metal to platinum is from 0.5 to 20.  
     
     
         5 . The catalyst of  claim 1 , wherein the amount of platinum is in the range of 0.3 to 5% by weight based on the weight of the catalyst.  
     
     
         6 . The catalyst of  claim 1 , wherein the catalyst has a reaction selectivity such that when the catalyst oxidizes carbon monoxide, a methanation reaction does not occur.  
     
     
         7 . A method of manufacturing a catalyst that oxidizes carbon monoxide, the method comprising: 
 uniformly mixing a platinum precursor, a transition metal precursor, and γ-alumina (γ-Al 2 O 3 ) in a dispersion medium to provide a mixture;    drying the mixture;    calcining the dried mixture; and    reducing the calcined dried mixture.    
     
     
         8 . The method of  claim 7 , wherein the weight ratio of the platinum precursor and the transition metal precursor is adjusted such that the atomic ratio of the transition metal to platinum is from 0.5 to 20.0.  
     
     
         9 . The method of  claim 7 , wherein the calcining is performed at a temperature of 300 to 500° C. for 1 to 12 hours.  
     
     
         10 . The method of  claim 7 , wherein the reducing is performed at a temperature of 150 to 500° C. for 1 to 12 hours.  
     
     
         11 . The method of  claim 7  wherein the platinum precursor and the transition metal precursor are compounds that do not contain a halogen.  
     
     
         12 . The method of  claim 7 , wherein the platinum precursor is Pt(NH 3 ) 4 (NO 3 ) 2 .  
     
     
         13 . The method of  claim 7 , wherein the transition metal precursor is selected from the group consisting of Ni(NO 3 ) 2 .6H 2 O, Co(NO 3 ) 2 .6H 2 O, Cu(NO 3 ) 2 .H 2 O and Fe(NO 3 ) 2 .9H 2 O.  
     
     
         14 . A fuel processor comprising the catalyst of  claim 1 .  
     
     
         15 . A fuel processor of  claim 14 , comprising a desulfurization device, at least one shift reaction device, and a PROX reaction device, wherein the catalyst is included in the PROX reaction device.  
     
     
         16 . A fuel cell system comprising the catalyst of  claim 1 .  
     
     
         17 . A fuel cell system of  claim 16 , comprising a fuel cell stack and a fuel processor, wherein the catalyst is included in the fuel processor.  
     
     
         18 . A fuel cell system of  claim 17 , wherein the fuel processor comprises a desulfurization device, at least one shift reaction device, and a PROX reaction device, and wherein the catalyst is included in the PROX reaction device.