Process for making molecular sieves
US10899627B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2020 |
| Grant date | Jan 26, 2021 |
| Priority date | — |
| Expiry date | Jun 4, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B37/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of synthesising a molecular sieve of DDR framework type. The method comprises: preparing a synthesis mixture capable of forming a molecular sieve of DDR framework type, said synthesis mixture comprising water, a silicon source, optionally a source of a trivalent element X, optionally a source of a pentavalent element Z, optionally a source of hydroxide ions, optionally a source of a metal cation M, a structure directing agent, and seed crystals having a framework type selected from CHA and LEV; said synthesis mixture being substantially free from fluoride ions; heating said synthesis mixture under static crystallization conditions for a time sufficient to form crystals of said molecular sieve of DDR framework type, said crystallization conditions including a temperature of from 100° C. to 220° C.; and, recovering said crystals of the molecular sieve of DDR framework type from the synthesis mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.