Method of making AEI-type zeolites having a high silica to alumina molar ratio (SAR)
US12319582B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2019 |
| Grant date | Jun 3, 2025 |
| Priority date | — |
| Expiry date | Aug 2, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of forming AEI-type zeolites in a hydrothermal synthesis without the use of hydrogen fluoride (HF) and in the presence of an FAU zeolite NaY with SAR ≤5, a Y zeolite with a SAR ≥5, or a combination thereof. A gel composition formed upon using this method includes one or more sources of silica, alumina, organic structure directing agents (OSDA), and alkali metal ions; zeolite seeds; and water. This gel composition is defined by the molar ratios of: SiO2/AI2O3 18:1 to 100:1; M2O/SiO2 0.15:1 to 0.30:1; ROH/SiO2 0.05:1 to 0.13:1; and H2O/SiO2 5:1 to 20:1; wherein M is the alkali metal ion and R is an organic moiety derived from the OSDA. This gel composition, after reacting at a temperature between 135° C. to about 200° C. for 10 hours to 168 hours forms the crystalline AEI-type zeolite having a silica to alumina ratio (SiO2:AI2O3) that is greater than 15:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.