Dual grid catalyst basket and method of independently supporting primary and secondary catalysts

Abstract

An ammonia oxidation catalyst basket design has two support grids. A first grid supports the primary catalyst and a separate, second grid supports the secondary catalyst. This dual grid design separates the two catalysts, and enables the catalysts to be independent of each other. Any interruption in the primary or the secondary catalyst does not impede or adversely impact on the structure or function of the other catalyst.

It is claimed: 
     
         1 . A catalyst basket comprising:
 a housing;   first support grid mounted to the housing for supporting an associated primary catalyst; and   a separate, second support grid mounted to the housing independently supporting an associated secondary catalyst.   
     
     
         2 . The catalyst basket of  claim 1  wherein the second support grid is spaced from the first support grid. 
     
     
         3 . The catalyst basket of  claim 1  wherein the first support grid includes openings that allow gas flow therethrough. 
     
     
         4 . The catalyst basket of  claim 3  wherein the second support grid includes openings that allow gas flow therethrough. 
     
     
         5 . The catalyst basket of  claim 1  wherein a primary catalyst is sealed along a periphery thereof. 
     
     
         6 . A method of supporting first and second catalysts in a catalyst basket comprising:
 supplying a housing   mounting a first support grid to the housing for supporting a primary catalyst; and   mounting a separate, second support grid to the housing for supporting a secondary catalyst and does not support the primary catalyst.   
     
     
         7 . The method of  claim 6  wherein the first and second support grids are mounted in spaced relation to independently support the primary and secondary catalysts, respectively.