Silicon substituted zeolite compositions and process for preparing same
US4503023A · kind A · utility
171Cited by
10References
20Claims
0Family size
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Key dates
| Filing date | Oct 28, 1981 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Oct 28, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/38
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Aluminum from AlO.sub.4 -tetrahedra of as-synthesized zeolites is extracted and substituted with silicon to form zeolite compositions having higher SiO.sub.2 /Al.sub.2 O.sub.3 molar ratios and exhibiting distinctive chemical and physical properties. The preparative procedure involves contact of the starting zeolite with an aqueous solution of a fluorosilicate salt using controlled proportions and temperature and pH conditions which avoid aluminum extraction without silicon substitution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.