Catalyst compositions and applications thereof

Abstract

In one aspect, structural catalyst bodies comprising one or more gradients of catalytic material are provided herein. In some embodiments, a structural catalyst body described herein comprises an inner partition wall having a first surface and a second surface opposite the first surface, the inner partition wall having a gradient of catalytic material along the width of the inner partition wall.

1 . A structural catalyst body comprising:
 at least one inner partition wall comprising a gradient of a bulk first catalytic material along a width of the inner partition wall.   
     
     
         2 . The structural catalyst body of  claim 1 , wherein the bulk first catalytic material of the gradient decreases in concentration at the periphery of the width of the inner partition wall. 
     
     
         3 . The structural catalyst body of  claim 1 , wherein the bulk first catalytic material of the gradient increases in concentration along a central region of the width of the inner partition wall. 
     
     
         4 . The structural catalyst body of  claim 1 , wherein the gradient of the bulk first catalytic material has a profile substantially symmetrical about a midpoint of the profile. 
     
     
         5 . The structural catalyst body of  claim 3 , wherein the concentration of the bulk first catalytic material at a point in the central region of the width of the inner partition wall is at least 1.3 times greater than a concentration of the bulk first catalytic material at a peripheral point of the width of the first surface. 
     
     
         6 . The structural catalyst body of  claim 3 , wherein the concentration of bulk first catalytic material at a point in the central region of the width of the inner partition wall is at least 2 times greater than a concentration of the bulk first catalytic material at a peripheral point of the width of the first surface. 
     
     
         7 . The structural catalyst body of  claim 1  further comprising a gradient of a bulk second catalytic material along a width of the inner partition wall. 
     
     
         8 . The structural catalyst body of  claim 7 , wherein the bulk second catalytic material of the gradient decreases in concentration at the periphery of the width of the inner partition wall. 
     
     
         9 . The structural catalyst body of  claim 7 , wherein the bulk second catalytic material of the gradient increases in concentration along a central region of the width of the inner partition wall. 
     
     
         10 . The structural catalyst body of  claim 1 , further comprising a plurality of additional inner partition walls comprising a gradient of bulk first catalytic material along a width of the inner partition walls, the bulk first catalytic material increasing in concentration along a central region of the width of the inner partition walls wherein the concentration of the bulk first catalytic material at a point in the central region is at least 1.3 times greater than a concentration of the bulk first catalytic material at a peripheral point of the width of the inner partition walls. 
     
     
         11 . The structural catalyst body of  claim 10 , wherein the bulk first catalytic material is operable for the selective catalytic reduction of nitrogen oxides. 
     
     
         12 . The structural catalyst body of  claim 10 , wherein the bulk first catalytic material is selected from the group consisting of V 2 O 5 , WO 3 , MoO 3  and Ru. 
     
     
         13 . The structural catalyst body of  claim 10 , further comprising a gradient of bulk second catalytic material along the width of the inner partition walls, the bulk second catalytic material increasing in concentration along the central region of the width of the inner partition walls wherein the concentration of the bulk second catalytic material at a point in the central region is at least 1.3 times greater than a concentration of the bulk second catalytic material at a peripheral point of the width of the inner partition walls. 
     
     
         14 . The structural catalyst body of  claim 13 , wherein the bulk second catalytic material is operable for the selective catalytic reduction of nitrogen oxides. 
     
     
         15 . The structural catalyst body of  claim 13 , wherein the bulk second catalytic material is selected from the group consisting of V 2 O 5 , WO 3 , MoO 3  and Ru. 
     
     
         16 . The structural catalyst body of  claim 10 , wherein greater than 50 percent of the inner partition walls of the structural catalyst body comprise the gradient of the bulk first catalytic material. 
     
     
         17 . The structural catalyst body of  claim 10 , wherein greater than 90 percent of the inner partition walls of the structural catalyst body comprise the gradient of the bulk first catalytic material.