Microporous rare earth silicates and method of producing same
US6379641B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | May 1, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B39/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Crystalline microporous rare earth silicates are provided. These microporous compositions have a three dimensional framework structure of at least silicon tetrahedral oxide units and at least one M oxide unit. M is a rare earth element. Optionally, the microporous compositions may contain as part of the framework an M′ element having a valence of +2, +3, +4 or +5 such as zinc (+2), iron (+3), zirconium (+4) and tantalum (+5). The composition is represented by the empirical formula:An(M1−zM′z)wSi1−yGeyOxwhere A is a cation such as sodium and “n”, “z”, “w”, “y” and “x” are the mole fractions of the various elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.