Catalytic applications of mesoporous metallosilicate molecular sieves and methods for their preparation
US5855864A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1997 |
| Grant date | Jan 5, 1999 |
| Priority date | — |
| Expiry date | Feb 11, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C46/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A neutral templating route to mesoporous molecular sieves based on H-bonding and self-assembly between neutral primary amine or diamine surfactants (S.degree.) and neutral inorganic precursors (I.degree.) has been used to prepare hexagonal and lamellar mesoporous silicas with site isolated transition metal centers. This templating approach allows for the preparation of hexagonal or hexagonal-like mesoporous oxidation catalysts with large framework wall thickness of at least about 17 .ANG., small elementary particle size (.ltoreq.400 .ANG.), and unique combinations of framework-confined mesopores and textural mesopores while at the same time providing for facile recovery of the neutral template by simple solvent extraction. The templating of neutral metallosilicate precursors (I.degree.) with neutral diamine surfactants (S.degree.-S.degree.) affords thermally stable pillared lamellar metallosilicates exhibiting complementary framework-confined microporosity and textural mesoporosity while at the same time also providing for template recovery by solvent extraction. In addition, a hexagonal transition metal-substituted catalysts, analogous to MCM-41, have been prepared using the media…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.