Preparation of alumina having increased porosity

Details Preparation of alumina having increased porosity Preparation of alumina having increased porosity

Filed on

1995-02-22

Date issued

1996-07-02

Examiner

Bos, Steven

Patent Class

Chemistry of inorganic compounds

SubClass

Oxygen or compound thereof

SubSubClass

Metal containing

Other Related Categories

423626, 423628, C01F 702

Type

Patent

Status

active

Patent number

055319769

Description

ABSTRACT:
A process for making high porosity boehmite alumina comprising forming an aqueous dispersion of a boehmite alumina which has been obtained by hydrothermally treating an aqueous mixture of a precursor boehmite alumina at 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, treating the dispersion of the hydrothermally treated alumina to form a viscous gel and subjecting the gel to sufficient shearing force for a sufficient period of time to increase the pore volume by at least 30% and the median pore radius by at least 20%.

REFERENCES:
patent: 4248852 (1981-02-01), Wakabayashi et al.
patent: 4676928 (1987-06-01), Leach et al.
patent: 4861410 (1989-08-01), Clark et al.
patent: 5055019 (1991-10-01), Meyer et al.
patent: 5077032 (1991-12-01), Mizukami et al.

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