THERMALLY STABLE DOPED AND UNDOPED POROUS ALUMINUM OXIDES AND NANOCOMPOSITE CeO2-ZrO2 AND Al2O3 CONTAINING MIXED OXIDES
AssigneeMagnesium Elektron Limited
InventorsRoberta Di Monte, Jan Kaspar, Stefano Desinan
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Abstract
The present invention relates to doped or undoped aluminas having after calcination at 1200° C. for 5-24 hours a pore volume ≧0.5 ml/g and a BET surface area greater then 35 m2/g. The invention also relates to a method for preparing these aluminas comprising the steps of: a. preparing an aqueous solution of an aluminum salt with optional co-dopants, b. treating the aqueous solution with hydrogen peroxide, c. precipitating the alumina using a base, and d. filtering, drying and calcining the alumina.
Claims30
A doped or undoped alumina having after calcination at 1200° C. for 5-24 hours a pore volume ≧0.5 ml/g and a BET surface area greater than 30 m2/g wherein the alumina is an alumina-containing nanocomposite material containing within its matrix agglomerated particles of more than one crystallographic phase.
(canceled)
A method of preparing thermally stable transitional alumina comprising the following steps:
- a. preparing an aqueous solution of an aluminium salt,
- b. treating the aqueous solution with hydrogen peroxide,
- c. precipitating the alumina using a base, and
- d. filtering, drying and calcining the alumina at a temperature and for a time sufficient to produce a doped or undoped alumina having after calcination at 1200° C. for 5-24 hours a pore volume ≧0.5 ml/g and a BET surface area greater than 30 m2/g wherein the alumina is an alumina-containing nanocomposite material containing within its matrix agglomerated particles of more than one crystallographic phase.
Dependencies are inferred from the claim text.