High porosity cerium and zirconium containing oxide
This disclosure generally relates to an oxide composition basically composed of cerium and zirconium that has exceptional and stable porosity, surface area and lattice oxygen mobility. The oxide composition can contain one or more other rare earth oxides other than cerium oxide. For example, some compositions can contain one or more of lanthanum oxide, yttrium oxide and neodymium oxide. The oxide composition can be useful as a catalyst, catalyst support, sensor applications and combinations thereof.
1. A composition comprising zirconium oxide, cerium oxide and optionally one or more other rare earth oxides other than cerium oxide, wherein the composition has a hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for 10 hours of from about 0.5 to about 1.1 molar ratio of H 2 consumption/CeO 2 , and wherein one or more of the following are true:
(i) wherein the composition has a total pore volume of about 0.7 to about 3.5 cc/g; and
(ii) wherein the composition has one or more of a BET and apparent surface area selected from the group consisting of from about 1.0 to about 6.0 m 2 /g after calcinations at 1200 degrees Celsius for a period of 10 hours or more in an oxidizing environment, from about 20 m 2 /g to about 30 m 2 /g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment, from about 45 m 2 /g to about 70 m 2 /g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment, and combinations thereof.
2. The composition of claim 1 , wherein (i) is true.
3. The composition of claim 2 , wherein the total pore volume is about 0.7 cc/g, and wherein the hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for 10 hours is about 0.5 molar ratio of H 2 consumption/CeO 2 .
4. The composition of claim 2 , wherein the total pore volume is about 3.20 cc/g, and wherein the hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment is about 0.99 molar ratio of H 2 consumption/CeO 2 .
5. The composition of claim 2 , wherein the total pore volume is about 0.7 cc/g, and wherein the hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment is about 0.99 molar ratio of H 2 consumption/CeO 2 .
6. The composition of claim 2 , wherein the total pore volume is about 3.20 cc/g, and wherein the hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for 10 hours is about 0.5 molar ratio of H 2 consumption/CeO 2 .
7. The composition of claim 1 , wherein (i) and (iii) are true.
8. The composition of claim 7 , wherein the total pore volume is about 0.7 cc/g, and wherein the one or more of a BET and apparent surface area is about 20 m 2 /g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment.
9. The composition of claim 7 , wherein the total pore volume is about 3.20 cc/g, and wherein the one or more of a BET and apparent surface area is about 30 m 2 /g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment.
10. The composition of claim 7 , wherein the total pore volume is about 0.7 cc/g, and wherein the one or more of a BET and apparent surface area is about 45 m 2 /g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment.
11. The composition of claim 7 , wherein the total pore volume is about 3.20 cc/g, and wherein the one or more of a BET and apparent surface area is about 70 m 2 /g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment.
12. The composition of claim 1 , wherein (ii) is true.
13. The composition of claim 12 , wherein the hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for 10 hours is about 0.5 molar ratio of H 2 consumption/CeO 2 , and wherein the one or more of a BET and apparent surface area is about 20 m 2 /g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment.
14. The composition of claim 12 , wherein the hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment is about 0.99 molar ratio of H 2 consumption/CeO 2 , and wherein the one or more of a BET and apparent surface area is about 30 m 2 /g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment.
15. The composition of claim 12 , wherein the hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment is about 0.99 molar ratio of H 2 consumption/CeO 2 , and wherein the one or more of a BET and apparent surface area is about 45 m 2 /g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment.
16. The composition of claim 12 , wherein the hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for 10 hours is about 0.5 molar ratio of H 2 consumption/CeO 2 , and wherein the one or more of a BET and apparent surface area is about 70 m 2 /g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment.
17. The composition of claim 1 , wherein the zirconium oxide comprises from about 1 to about 99 wt % of the composition, wherein the cerium oxide comprises from about 1 to about 99 wt % of composition, and wherein the one or more rare earth oxides other than cerium oxide comprise from about 0.1 to about 30 wt % of the composition.
18. The composition of claim 1 , wherein the zirconium oxide comprises from about 60 wt % to about 85 wt % of the composition, wherein the cerium oxide comprises from about 5 wt % to about 30 wt % of the composition.
19. The composition of claim 1 , wherein the composition comprises from about 5 wt % to about 20 wt % of the one or more rare earth oxides other than cerium oxide.
20. The composition of claim 1 , wherein the composition comprises from about 1.5 wt % to about 6 wt % lanthanum oxide.
21. A composition comprising zirconium oxide, cerium oxide and optionally one or more other rare earth oxides other than cerium oxide, wherein the composition has a hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for 10 hours of from about 0.54 to about 0.99 molar ratio of H 2 consumption/CeO 2 , and wherein one or more of the following are true:
(i) wherein the composition has a total pore volume of about 0.65 to about 3.20 cc/g; and
(ii) wherein the composition has one or more of a BET and apparent surface area selected from the group consisting of from about 1.9 to about 5.2 m 2 /g after calcinations at 1200 degrees Celsius for a period of 10 hours or more in an oxidizing environment, from about 24 m 2 /g to about 29 m 2 /g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment, from about 50 m 2 /g to about 65 m 2 /g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment, and combinations thereof.
22. The composition of claim 21 , wherein (i) is true.
23. The composition of claim 21 , wherein (ii) is true.
24. The composition of claim 21 , wherein (i) and (ii) are true.
25. The composition of claim 21 , wherein the zirconium oxide comprises from about 1 to about 99 wt % of the composition, wherein the cerium oxide comprises from about 1 to about 99 wt % of composition, and wherein the one or more rare earth oxides other than cerium oxide comprise from about 0.1 to about 30 wt % of the composition.
26. The composition of claim 21 , wherein the zirconium oxide comprises from about 60 wt % to about 85 wt % of the composition, wherein the cerium oxide comprises from about 5 wt % to about 30 wt % of the composition.
27. The composition of claim 21 , wherein the composition comprises from about 5 wt % to about 20 wt % of the one or more rare earth oxides other than cerium oxide.
28. The composition of claim 21 , wherein the composition comprises from about 1.5 wt % to about 6 wt % lanthanum oxide.
29. A composition comprising zirconium oxide, cerium oxide and optionally one or more other rare earth oxides other than cerium oxide, wherein the zirconium oxide comprises from about 60 wt % to about 85 wt % of the composition, wherein the cerium oxide comprises from about 5 wt % to about 30 wt % of the composition, wherein the one or more other rare earth oxides other than the cerium oxide or yttrium comprise from about 0.1 to about 30 wt % of the composition, wherein the composition has a hydrogen thermal program reduction uptake after calcination at 1000 degrees Celsius for 10 hours of about 0.5 to about 1.1 molar ratio of H 2 consumption/CeO 2 , and wherein one or more of the following are true:
(i) wherein the composition has a total pore volume of from about 0.7 to about 3.5 cc/g; and
(ii) wherein the composition has one or more of a BET and apparent surface area selected from the group consisting of from about 1.0 to about 6.0 m 2 /g after calcinations at 1200 degrees Celsius for a period of 10 hours or more in an oxidizing environment, from about 20 m 2 /g to about 30 m 2 /g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment, from about 45 m 2 /g to about 70 m 2 /g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment, and combinations thereof.
30. The composition of claim 29 , wherein (i) and (ii) are true.