Gradient catalyst compositions and applications thereof
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:
a plurality of centerposts defined by intersection of a plurality of inner partition walls, wherein at least one of the centerposts comprises a concentration of first catalytic material therein that is at least 1.3 times less than concentration of the first catalytic material within a central region of one or more of the inner partition walls.
2. The structural catalyst body of claim 1 , wherein greater than 50% of the centerposts comprise a concentration of the first catalytic material therein that is at least 1.3 times less than the concentration of the first catalytic material within a central region of the one or more inner partition walls.
3. The structural catalyst body of claim 1 , wherein at least one of the centerposts comprises a concentration of second catalytic material therein that is at least 1.3 times less than concentration of the second catalytic material within a central region of the one or more inner partition walls.
4. The structural catalyst body of claim 3 , wherein greater than 50% of the centerposts comprise a concentration of the second catalytic material therein that is at least 1.3 times less than the concentration of the second catalytic material within a central region of the one or more inner partition walls.
5. The structural catalyst body of claim 3 , wherein the second catalytic material is operable for the selective catalytic reduction of nitrogen oxides.
6. The structural catalyst body of claim 5 , wherein the second catalytic material is selected from the group consisting of V 2 O 5 , WO 3 , MoO 3 and Ru.
7. The structural catalyst body of claim 1 , wherein the first catalytic material is operable for the selective catalytic reduction of nitrogen oxides.
8. The structural catalyst body of claim 7 , wherein the first catalytic material is selected from the group consisting of V 2 O 5 , WO 3 , MoO 3 and Ru.
9. The structural catalyst body of claim 1 , wherein the concentration of the first catalytic material in the centerpost is at least 2 times less than the concentration of the first catalytic material within the central region of the one or more inner partition walls.
10. The structural catalyst body of claim 9 , wherein greater than 50% of the centerposts comprise a concentration of the first catalytic material therein that is at least 2 times less than the concentration of the first catalytic material within the central region of the one or more inner partition walls.
11. The structural catalyst body of claim 10 , wherein the first catalytic material is selected from the group consisting of V 2 O 5 , WO 3 , MoO 3 and Ru.
12. The structural catalyst body of claim 1 , wherein the concentration of the first catalytic material in the centerpost is at least 3 times less than the concentration of the first catalytic material within the central region of the one or more inner partition walls.
13. The structural catalyst body of claim 12 , wherein greater than 50% of the centerposts comprise a concentration of the first catalytic material therein that is at least 3 times less than the concentration of the first catalytic material within the central region of the one or more inner partition walls.
14. The structural catalyst body of claim 13 , wherein the first catalytic material is selected from the group consisting of V 2 O 5 , WO 3 , MoO 3 and Ru.
15. The structural catalyst body of claim 1 , wherein at least one of the centerposts comprises a concentration of second catalytic material therein that is at least 2 times less than concentration of the second catalytic material within a central region of the one or more inner partition walls.
16. The structural catalyst body of claim 15 , wherein greater than 50% of the centerposts comprise a concentration of the second catalytic material therein that is at least 2 times less than the concentration of the second catalytic material within the central region of the one or more inner partition walls.
17. The structural catalyst body of claim 16 , wherein the second catalytic material is selected from the group consisting of V 2 O 5 , WO 3 , MoO 3 and Ru.
18. The structural catalyst body of claim 1 , wherein at least one of the centerposts comprises a concentration of second catalytic material therein that is at least 3 times less than concentration of the second catalytic material within a central region of the one or more inner partition walls.
19. The structural catalyst body of claim 18 , wherein greater than 50% of the centerposts comprise a concentration of the second catalytic material therein that is at least 3 times less than the concentration of the second catalytic material within the central region of the one or more inner partition walls.
20. The structural catalyst body of claim 19 , wherein the second catalytic material is selected from the group consisting of V 2 O 5 , WO 3 , MoO 3 and Ru.