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The present invention provides a cerium oxide particulate composition and a process for preparing a cerium oxide particulate composition comprising aggregates of approximately spherical primary particles of cerium oxide. The method involves preparing a solution of a cerium oxide precursor, aerosoliz

The present invention provides a cerium oxide particulate composition and a process for preparing a cerium oxide particulate composition comprising aggregates of approximately spherical primary particles of cerium oxide. The method involves preparing a solution of a cerium oxide precursor, aerosolizing the cerium oxide precursor solution, and heating the aerosol to provide the cerium oxide particle composition.

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1. A cerium oxide particulate composition comprising aggregates consisting essentially of approximately spherical primary particles of cerium oxide, wherein the aggregates comprise a mixture of cenospherical and aciniform aggregates.2. The composition of claim 1, wherein about 90% or more (by weight

1. A cerium oxide particulate composition comprising aggregates consisting essentially of approximately spherical primary particles of cerium oxide, wherein the aggregates comprise a mixture of cenospherical and aciniform aggregates.2. The composition of claim 1, wherein about 90% or more (by weight) of the aggregates are cenospherical aggregates.3. The composition of claim 2, wherein about 95% or more (by weight) of the aggregates are cenospherical aggregates.4. The composition of claim 3, wherein about 98% or more (by weight) of the aggregates are cenospherical aggregates.5. The composition of claim 1, wherein the primary particles have an average diameter (by number) of about 30 nm or less.6. The composition of claim 5, wherein the primary particles have an average diameter (by number) of about 20 nm or less.7. The composition of claim 6, wherein the primary particles have an average diameter (by number) of about 10 nm or less.8. The composition of claim 1, wherein the aggregates have a density of about 6 g/cm3 or more.9. The composition of claim 8, wherein the aggregates have a density of about 6-7 g/cm3.10. The composition of claim 1, wherein the cenospherical aggregates have an average diameter (by weight) of about 1-20 μm.11. The composition of claim 10, wherein the cenospherical aggregates have an average diameter (by weight) of about 5-10 μm.12. The composition of claim 1, wherein the aciniform aggregates have an average diameter (by number) of about 500 nm or less.13. The composition of claim 12, wherein the aciniform aggregates have an average diameter (by number) of about 200 nm or less.14. The composition of claim 13, wherein the aciniform aggregates have an average diameter (by number) of about 100 nm or less.15. The composition of claim 1, wherein the aggregates have a surface area of about 50 m2/g or more.16. The composition of claim 15, wherein the aggregates have a surface area of about 70 m2/g or more.17. The composition of claim 1, wherein the primary particles have a crystallite size of about 1-30 nm.18. The composition of claim 17, wherein the primary particles have a crystallite size of about 5-15 nm.