Catalyst and method of making the same
View Patent ↗In one embodiment, a method for making a composition can comprise combining a Type II aluminum hydroxide gel with a Type II oxygen storage gel prior to calcination to form a combined gel, and spray drying the combined gel to form a dried composite. A composition can comprise a composite comprising a Type II aluminum oxide component and about 5 wt % to about 70 wt % Type II oxygen storage component, based upon a total weight of the composite. The oxygen storage component can comprises a cluster of primary oxygen storage particles having a particle size, measured along a major axis, of about 50 Å to about 100 Å.
1. A composition, comprising:
a composite comprising a Type II aluminum oxide component matrix having pore size of 120 Å to 1000 Å in diameter; and
about 5 wt % to about 70 wt % Type II oxygen storage crystallite component, based upon a total weight of the composite, wherein the oxygen storage crystallite component comprises clusters of primary oxygen storage particles having a particle size, measured along a major axis, of about 50 Å to about 100 Å;
said clusters being porous with a pore size of 120 Å to 1000 Å in diameter;
wherein the clusters comprise about 5 to about 500 primary oxygen storage particles, and wherein the clusters are dispersed within the aluminum oxide component matrix;
said composition having been made by a method comprising:
combining a Type II aluminum hydroxide gel with a Type II oxygen storage gel prior to any calcination to form a combined gel; and
spray drying the combined gel to form a dried composite.
2. The composition of claim 1 , wherein the composite comprises about 10 wt % to about 50 wt % oxygen storage crystallite component, based upon a total weight of the composite.
3. The composition of claim 2 , wherein the composite comprises about 20 wt % to about 40 wt % oxygen storage crystallite component, based upon a total weight of the composite.
4. The composition of claim 1 , wherein the clusters comprise about 10 to about 150 primary oxygen storage particles.
5. The composition of claim 4 , wherein the clusters comprise about 20 to about 50 primary oxygen storage particles.
6. The composition of claim 1 , wherein the composite comprises a pore volume of about 0.2 cm 3 /g to about 1.2 cm 3 /g.
7. The composition of claim 6 , wherein the pore volume is about 0.6 cm 3 /g to about 1.0 cm 3 /g.
8. The composition of claim 1 , wherein the composite comprises a surface area of about 40 to about 200 m 2 /g.
9. The composition of claim 8 , wherein the surface area is about 80 m 2 /g to about 150 m 2 /g.
10. The composition of claim 1 , wherein the oxygen storage crystallite component comprises cerium, zirconium, and an additive selected from the group consisting of alkaline earth metal, rare earth metal, transition metal, and mixtures thereof.
11. The composition of claim 10 , wherein the additive is selected from the group consisting of a strontium, calcium, lanthanum, yttrium, praseodymium, neodymium, manganese, iron, nickel, cobalt, and mixtures thereof.
12. The composition of claim 11 , wherein the oxygen storage crystallite component comprises greater than or equal to 2 additives.
13. A composition, comprising:
a composite comprising a Type II aluminum oxide component matrix having pore size of 120 Å to 1000 Å in diameter and a Type II oxygen storage crystallite component, wherein the aluminum oxide component has alumina primary particles with a particle size, as measured along a major axis, of about 50 Å to about 500 Å;
wherein the oxygen storage crystallite component comprises clusters of primary oxygen storage particles having a particle size, measured along a major axis, of about 50 Å to about 100 Å;
said clusters being porous with a pore size of 120 Å to 1000 Å in diameter;
wherein the clusters comprise about 5 to about 500 primary oxygen storage particles which are dispersed within the aluminum oxide component matrix;
said composition having been made by a method comprising:
combining a Type II aluminum hydroxide gel with a Type II oxygen storage gel prior to any calcination to form a combined gel; and
spray drying the combined gel to form a dried composite.
14. A method for making a composition, which composition comprises
a Type II aluminum oxide component matrix having pore size of 120 Å to 1000 Å in diameter; and
about 5 wt % to about 70 wt % Type II oxygen storage crystallite component, based upon a total weight of the composite, wherein the oxygen storage crystallite component comprises clusters of primary oxygen storage particles having a particle size, measured along a major axis, of about 50 Å to about 100 Å;
said clusters being porous with a pore size of 120 Å to 1000 Å in diameter;
wherein the clusters comprise about 5 to about 500 primary oxygen storage particles, and wherein the clusters are dispersed within the aluminum oxide component matrix;
said method comprising:
combining a Type II aluminum hydroxide gel with a Type II oxygen storage gel prior to any calcination to form a combined gel; and
spray drying the combined gel to form a dried composite.
15. The method of claim 14 , further comprising calcining the dried composite to form a calcined composite comprising an oxygen storage component and an aluminum oxide matrix.
16. The method of claim 14 , further comprising forming an aluminum hydroxide precursor, stabilizing the aluminum hydroxide precursor, and forming the Type II aluminum hydroxide gel.
17. The method of claim 14 , further comprising forming the Type II oxygen storage gel from an oxygen storage component precursor comprising cerium salt, zirconium salt, and an additive selected from the group consisting of alkaline earth salt, rare earth salt, transition metal salt, mixtures thereof.
18. The method of claim 17 , wherein the additive is selected from the group consisting of a strontium salt, calcium salt, lanthanum salt, yttrium salt, praseodymium salt, neodymium salt, manganese salt, iron salt, nickel salt, cobalt salt, and mixtures thereof.
19. An exhaust emission control device, comprising:
a housing;
a substrate comprising a catalyst supported on a composite, wherein the composite comprises
a Type II aluminum oxide component matrix having a pore size of 120 Å to 1000 Å in diameter and a Type II oxygen storage crystallite component, wherein the aluminum oxide component has alumina primary particles with a diameter, as measured along a major axis, of about 50 Å to about 500 Å;
wherein the oxygen storage crystallite component comprises clusters of primary oxygen storage particles having a particle size, measured along a major axis, of about 50 Å to about 100 Å and having a pore size of 120 Å to 1000 Å in diameter;
wherein the clusters comprise about 5 to about 500 primary oxygen storage particles; and
wherein the clusters are dispersed within the aluminum oxide component matrix; and
a retention material disposed between the housing and the substrate.
20. A composition, comprising:
a composite comprising a Type II aluminum oxide component matrix having pore size of 120 Å to 1000 Å in diameter; and
about 5 wt % to about 70 wt % Type II oxygen storage crystallite component, based upon a total weight of the composite, wherein the oxygen storage crystallite component consists of clusters of primary oxygen storage particles having a particle size, measured along a major axis, of about 50 Å to about 100 Å;
said clusters being porous with a pore size of 120 Å to 1000 Å in diameter;
wherein the clusters comprise about 5 to about 500 primary oxygen storage particles, and wherein the clusters are dispersed within the aluminum oxide component matrix;
said composition having been made by a method comprising:
combining a Type II aluminum hydroxide gel with a Type II oxygen storage gel prior to any calcination to form a combined gel; and
spray drying the combined gel to form a dried composite.