Carbon monoxide oxidation catalyst, method for preparation of carbon monoxide oxidation catalyst and method for production of hydrogen-containing gas

Abstract

Provided is a catalyst for selective oxidation of CO gas in a gas of essentially hydrogen, and a method for producing the catalyst. The catalyst is highly active in a relatively high temperature range. The catalyst is for selectively oxidizing CO gas with hydrogen, and this carries ruthenium held on a carrier of titania and alumina, or carries ruthenium with an alkali metal and/or an alkaline earth metal held thereon. For producing the catalyst, a solution containing ruthenium and an alkali metal and/or an alkaline earth metal is applied to the carrier.

1 - 10 . (Canceled).  
     
     
         11 . A method for producing a CO oxidation catalyst comprising ruthenium with an alkali metal held on a carrier of titania and alumina, wherein the weight ratio of titania to alumina falls between 1/99 and 15/85, and the amount of ruthenium falls between 0.3 and 3% by weight of the carrier, which comprises applying a solution of ruthenium and a solution of an alkali metal to the carrier.  
     
     
         12 . The method for producing a CO oxidation catalyst as claimed in  claim 11 , wherein the carrier has titania adhering onto a shaped alumina.  
     
     
         13 . The method for producing a CO oxidation catalyst as claimed in  claim 12 , wherein the shaped alumina is a solid grains or powder of alumina.  
     
     
         14 . A method for producing a CO-reduced, hydrogen-containing gas, which comprises selectively oxidizing carbon monoxide in a gas of essentially hydrogen, with oxygen in the presence of a CO oxidation catalyst produced in the process of  claim 11 .  
     
     
         15 . The method for producing a hydrogen-containing gas as claimed in  claim 14 , wherein the gas of essentially hydrogen is obtained by reforming or partially oxidizing a hydrogen-producing starting material.  
     
     
         16 . The method for producing a hydrogen-containing gas as claimed in  claim 14 , wherein the hydrogen-containing gas produced is for fuel cells.  
     
     
         17 . A method for producing a CO-reduced, hydrogen-containing gas, which comprises selectively oxidizing carbon monoxide in a gas of essentially hydrogen, with oxygen in the presence of a CO oxidation catalyst comprising ruthenium with an alkali metal held on a carrier of titania and alumina wherein the weight ratio of titania to alumina falls between 1/99 and 15/85, the amount of ruthenium falls between 0.3 and 3% by weight of the carrier, and the alkali metal is at least one selected from the group consisting of potassium, cesium, rubidium, sodium and lithium.  
     
     
         18 . The method for producing a hydrogen-containing gas as claimed in  claim 17 , wherein the carrier has titania adhering onto a shaped alumina.  
     
     
         19 . The method for producing a hydrogen-containing gas as claimed in  claim 18 , wherein the shaped alumina is a solid grains or powder of alumina.  
     
     
         20 . The method for producing a hydrogen-containing gas as claimed in  claim 17 , wherein the gas of essentially hydrogen is obtained by reforming or partially oxidizing a hydrogen-producing starting material.  
     
     
         21 . The method for producing a hydrogen-containing gas as claimed in  claim 18 , wherein the gas of essentially hydrogen is obtained by reforming or partially oxidizing a hydrogen-producing starting material.  
     
     
         22 . The method for producing a hydrogen-containing gas as claimed in  claim 17 , wherein the hydrogen-containing gas produced is for fuel cells.