Precious Metal Water-Gas Shift Catalyst with Oxide Support Modified with Rare Earth Elements

Abstract

A water gas shift catalyst comprising a platinum group metal dispersed on an inorganic oxide support modified with a carbon-containing burn-out additive and a rare earth oxide. A water gas shift catalyst containing alumina, a platinum group metal, and oxides of Pr and Nd are also disclosed.

1 . A catalyst useful for producing hydrogen from an input gas stream comprising carbon monoxide and steam, the catalyst comprising an inorganic oxide support modified by addition of a carbon-containing burn-out additive and subsequent removal of said additive by heat, said catalyst containing a platinum group metal dispersed on said modified support. 
   
   
       2 . The catalyst of  claim 1  wherein the platinum group metal is selected from the group consisting of platinum, palladium, rhodium, ruthenium, and iridium. 
   
   
       3 . The catalyst of  claim 1  wherein said platinum group metal is present in amounts of from 0.1 to 10 wt. % based on said inorganic oxide support. 
   
   
       4 . The catalyst of  claim 1  wherein said oxide support is modified by adding said additive in amounts of from about 1 to 20 wt. % relative to said inorganic oxide support. 
   
   
       5 . The catalyst of  claim 1  wherein said burn-out additive is selected from the group consisting of sugars, starches, lignin, grain flour, wood flour, and polymers. 
   
   
       6 . The catalyst of  claim 4  wherein said additive is wood flour. 
   
   
       7 . The catalyst of  claim 1  wherein said inorganic oxide support is further modified by addition of a rare earth oxide. 
   
   
       8 . The catalyst of  claim 7  wherein said rare earth oxide is present in amounts of from about 2 to 20 wt. % relative to the inorganic oxide support. 
   
   
       9 . The catalyst of  claim 1  wherein said inorganic oxide support is alumina. 
   
   
       10 . The catalyst of  claim 7  further including an alkali metal compound added to said modified inorganic oxide support. 
   
   
       11 . A catalyst useful for producing hydrogen from an input gas stream comprising carbon monoxide and steam, the catalyst comprising a rare earth oxide-modified alumina support and a platinum group metal, said rare earth oxide selected from praseodymium and neodymium oxide. 
   
   
       12 . The catalyst of  claim 11  wherein said platinum group metal is selected from the group consisting of platinum, palladium, rhodium, ruthenium, and iridium. 
   
   
       13 . The catalyst of  claim 11  wherein said platinum group metal is present in amounts of from 0.1 to 10 wt. % based on said alumina support. 
   
   
       14 . The catalyst of  claim 11  wherein said rare earth oxide is present in amounts of from 2 to 20 wt. % relative to the modified alumina support. 
   
   
       15 . The catalyst of  claim 11  further containing an alkali metal component comprising Li, Na, K, Rb, or Cs. 
   
   
       16 . The catalyst of  claim 15  wherein said alkali metal component is present in amounts of 0.2 to 15 wt. % as metal relative to said alumina support. 
   
   
       17 . The catalyst of  claim 1  or  11  wherein the catalyst is in the form of a washcoat composition deposited on a honeycomb monolith. 
   
   
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