Process for preparing crystalline aluminosilicate compositions using charge density matching
US7578993B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2004 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Apr 5, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B39/48
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for preparing crystalline alumino-silicate compositions has been developed. The process involves preparing a charge density mismatch reaction mixture comprising sources of aluminum, silicon, optionally an E metal and at least one charge density mismatch (CDM) template. The CDM template is an organic nitrogen containing template, in the hydroxide form, e.g. tetraethylammonium hydroxide and is characterized in that it is incapable of inducing crystallization. To this mixture there is added a solution comprising a second templating agent termed a crystallization template (CT). The CT can be an organic template different from the CDM template, an alkali metal, an alkaline earth metal and mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.