Process for preparing ultra-stable, high surface area alpha-alumina
US4169883A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1978 |
| Grant date | Oct 2, 1979 |
| Priority date | — |
| Expiry date | Jul 25, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/13
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The preparation of an ultra-stable, high surface area alpha-alumina catalyst and catalyst support suitable for use in high temperature processes such as petroleum refining processes, e.g., resid cat cracking and steam reforming, is disclosed. The process comprises impregnating high surface area gamma-alumina having narrow pores with a carbonaceous material that readily chars to form carbon. The impregnated alumina is then heated to a temperature sufficient to induce charring, following which the gamma-alumina is converted to alpha-alumina by further heating. The carbon is subsequently removed by oxidation. The alpha-alumina thus produced can withstand temperatures up to at least about 1000.degree. C. in the presence of steam without substantial loss of surface area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.