Crystalline silicate compositions and method of preparation
US5672556A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1995 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Sep 13, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C46/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Crystalline silicate compositions having unique combinations of framework-confined uniform mesopores and textural mesopores and to a method for their preparation. The compositions typically possess a small particle size of .ltoreq.400 .ANG., a ratio of textural to framework-confined mesoporosity of 0.2 or greater, and a novel ability to discriminate, to adsorb, and with a metal element in the mesopores, to catalytically transform large organic molecules. The method for the formation of the mesoporous structure is accomplished by hydrogen bonding between a non-ionic amine template and a non-ionic inorganic oxide precursor followed by hydrolysis and crosslinking under mild reaction conditions. The templated products of this invention are preferably obtained using water as a hydrolyzing reagent and an alcohol as a co-solvent. The framework-confined uniform mesopore size can be expanded without the use of an auxiliary organic (pore expanding agent). The template can be easily recovered and recycled, preferably, by ethanol extraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.