Porous aluminum hydrate
AssigneeRhodia Operations
InventorsJulien Hernandez, Olivier Larcher
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Abstract
The present invention relates to a porous aluminum hydrate, to a process for preparing same and to the use of same as intermediate in the preparation of an alumina or of a mixed oxide based on aluminum, on cerium and on zirconium. The invention also relates to the alumina obtained from the aluminum hydrate.
Claims20
An aluminum hydrate identified by X-ray diffraction as including boehmite, which may optionally comprise at least one additional element selected from lanthanum, praseodymium or a mixture of the two elements, characterized in that, after having been calcined in air at a temperature of 900° C. for 2 h, it has:
- a pore volume in the domain of the pores having a size of less than or equal to 20 nm (denoted by VP20nm-N2) such that VP20nm-N2:
- is greater than or equal to 30%×VPT-N2;
- is less than or equal to 60%×VPT-N2;
- and
- a pore volume in the domain of the pores having a size of between 40 and 100 nm (denoted by VP40-100nm-N2) such that VP40-100nm-N2 is greater than or equal to 20%×VPT-N2;
- VPT-N2 denoting the total pore volume of the aluminum hydrate after calcination in air at 900° C. for 2 hours and being between 0.65 and 1.15 mL/g;
- the pore volumes being determined by the nitrogen porosimetry technique.
Dependencies are inferred from the claim text.