Crystalline silicates and process for the production thereof
US4837000A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1986 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Dec 11, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/36
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Crystalline silicates and processes for the production thereof are described. These crystalline silicates are of new crystalline structure, which, as determined after calcination in the air at 550.degree. C., have a composition represented by the general formula (I): pM.sub.2/n O.Al.sub.2 O.sub.3.qSiO.sub.2 (the symbols are as defined in the appended claims) and give a X-ray diffraction pattern as shown in Table 2. They are superior in heat resistance and acid resistance, and can be used as catalysts for the conversion of various organic compounds, absorbents, or as catalysts for various reactions. They are produced by reacting an aqueous mixture comprising (a) a silica source, (b) an alumina source, (c) an alkali metal and/or alkaline earth metal source, and monoethanolamine at a temperature of 100.degree. to 300.degree. C. until the desired crystalline silicates are formed. Although monoethanolamine does not remain in the crystalline silicates, it plays an important role in the formation of the desired crystalline structure in the course of the production thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.