Mesoporous silicates and method of making same
US6334988B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1999 |
| Grant date | Jan 1, 2002 |
| Priority date | — |
| Expiry date | Aug 20, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B33/26
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of preparing mesoporous silica from a reaction mixture comprising a mineral acid such as HCl, an inorganic oxide source such as tetraethoxysilane, a surfactant such as cetyltrimethlyammonium bromide and water. The reaction mixture is mixed, e.g., by stirring or sonication, until sufficiently polymerized that mesostructured silica may be formed by a subsequent heating step, as indicated by the reaction mixture becoming opaque. This mixing is typically performed at room temperature for about 30-70 minutes. Then, the reaction mixture is heated in a pressurized vessel at a time, temperature and pressure sufficient to form mesostructured silica, e.g., at 60 to 230° C. for 15 to 80 minutes. Finally, mesoporous silica is recovered by filtering, drying and calcining in a furnace having a temperature in the range of 400 to 600° C. in air for at least 6 hours. Mesoporous silica made in accordance with present invention has pores with a narrow diameter distribution (23-24 å), but with highly disordered placement relative to one another. As a result, the mesoporous silica is characterized by powder X-ray diffraction pattern having no discernible peaks or one unusually br…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.