EP 0630356 A4 19950614 - PREPARATION OF STABILIZED ALUMINA HAVING ENHANCED RESISTANCE TO LOSS OF SURFACE AREA AT HIGH TEMPERATURES.
Title (en)
PREPARATION OF STABILIZED ALUMINA HAVING ENHANCED RESISTANCE TO LOSS OF SURFACE AREA AT HIGH TEMPERATURES.
Title (de)
HERSTELLUNG VON STABILISIERTEM ALUMINIUMOXID MIT ERHÖHTEM WIDERSTAND GEGEN OBERFLÄCHEVERLUST AUF HOHEN TEMPERATUREN.
Title (fr)
PREPARATION D'ALUMINE STABILISEE PRESENTANT UNE RESISTANCE ACCRUE A LA PERTE DE SUPERFICIE AUX TEMPERATURES ELEVEES.
Publication
Application
Priority
- US 9302104 W 19930310
- US 84974792 A 19920312
- US 84988292 A 19920312
Abstract (en)
[origin: WO9317968A1] 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.
IPC 1-7
IPC 8 full level
C01F 7/02 (2022.01); C01F 7/021 (2022.01)
CPC (source: EP)
C01F 7/02 (2013.01); C01F 7/021 (2013.01); C01P 2006/13 (2013.01); C01P 2006/14 (2013.01); C01P 2006/16 (2013.01); C01P 2006/17 (2013.01)
Citation (search report)
- [A] FR 2550099 A1 19850208 - NIKKI UNIVERSAL CO LTD [JP]
- See references of WO 9317968A1
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI NL SE
DOCDB simple family (publication)
WO 9317968 A1 19930916; CA 2131795 A1 19930916; CA 2131795 C 20040203; EP 0630356 A1 19941228; EP 0630356 A4 19950614
DOCDB simple family (application)
US 9302104 W 19930310; CA 2131795 A 19930310; EP 93907334 A 19930310