Preparation of stabilized alumina having enhanced resistance...

Details Preparation of stabilized alumina having enhanced resistance... Preparation of stabilized alumina having enhanced resistance...

C - Chemistry, Metallurgy

01

F

C01F 7/02 (2006.01) B01J 13/00 (2006.01)

Patent

CA 2131795

A process for preparing stabilized alumina having increased surface area retention at high temperature in which a gel of a boehmite alumina which has been obtained by hydrothermally treating an aqueous mixture of a precursor beohmite alumina having a pH of from about 5 to about 9 for a period of time sufficient to convert the greater portion of the precursor boehmite alumina to a colloidal sol is subjected to working as, for example, by using a sufficient shearing force for a sufficient period of time to produce a worked boehmite alumina which has an increase in pore volume of at least about 30 percent and an increase of median pore radius of at least about 20 percent, a stabilizer being added to the boehmite alumina, the stabilizer being an oxide of a metal such as barium or a metal included in the lanthanide series of metals or a compound of such metals which converts to an oxide at elevated temperatures.

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