Preparation of zeolites of type ZSM-5
US4891199A · kind A · utility
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8Claims
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Key dates
| Filing date | Dec 22, 1986 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Dec 22, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B39/38
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Zeolites of type ZSM-5, well suited as absorbents/catalysts, are facilely prepared by (i) intimately admixing a source of alumina with a source of silica, in aqueous reaction medium having a pH ranging from 1 to 7 and wherein the molar ratio SiO.sub.2 /Al.sub.2 O.sub.3 ranges from 5 to 100, (ii) adding a source of alkali metal oxide to the reaction mixture resulting from said stage (i), said combined reaction mixture having a pH ranging from 8 to 12, and thence (iii) crystallizing a zeolite of type ZSM-5 therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.