High porosity cerium and zirconium containing oxide
AssigneeNeo Performance Materials (Singapore) Pte. Ltd.
InventorsDmitrios Psaras, Szu Hwee Ng, Happy, Shaun Pei Xiong Tio
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Abstract
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.
Claims30
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 H2 consumption/CeO2, 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 m2/g after calcinations at 1200 degrees Celsius for a period of 10 hours or more in an oxidizing environment, from about 20 m2/g to about 30 m2/g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment, from about 45 m2/g to about 70 m2/g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment, and combinations thereof.
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 H2 consumption/CeO2, 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 m2/g after calcinations at 1200 degrees Celsius for a period of 10 hours or more in an oxidizing environment, from about 24 m2/g to about 29 m2/g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment, from about 50 m2/g to about 65 m2/g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment, and combinations thereof.
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 H2 consumption/CeO2, 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 m2/g after calcinations at 1200 degrees Celsius for a period of 10 hours or more in an oxidizing environment, from about 20 m2/g to about 30 m2/g after calcination at 1100 degrees Celsius for a period of 10 hours in an oxidizing environment, from about 45 m2/g to about 70 m2/g after calcination at 1000 degrees Celsius for a period of 10 hours in an oxidizing environment, and combinations thereof.
Dependencies are inferred from the claim text.