Synthesis of microporous ceramics
US6624228B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1996 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Jul 26, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B38/0022
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides for microporous ceramic materials having a surface area in excess of 50 m2/gm and an open microporous cell structure wherein the micropores have a mean width of less than 20 Angstroms and wherein said microporous structure comprises a volume of greater than about 0.015 cm3/gm of the ceramic. The invention also provides for a preceramic composite intermediate composition comprising a mixture of a ceramic precursor and finely divided particles comprising a non-silicon containing ceramic, carbon, or an inorganic compound having a decomposition temperature in excess of 400° C., whose pyrolysis product in inert atmosphere or in an ammonia atmosphere at temperatures of up to less than about 1100° C. gives rise to the microporous ceramics of the invention. Also provided is a process for the preparation of the microporous ceramics of the invention involving pyrolysis of the ceramic intermediate under controlled conditions of heating up to temperatures of less than 1100° C. to form a microporous ceramic product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.