Crystalline aluminumphosphate compositions
US5374411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1988 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Jun 15, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Crystalline aluminumphosphate compositions having three-dimensional microporous crystal framework structures whose chemical composition expressed in terms of mole ratios is Al.sub.2 O.sub.3 :1.0.+-.P.sub.2 O.sub.5 are disclosed. These compositions have an X-ray diffraction pattern characterized by d spacings at less than about 40 degrees two-theta as measured using copper K-alpha radiation that are substantially as shown in Table 1. The compositions can further comprise a structure-directing agent. Preparation is by admixing an aluminum source, a phosphorus source and 10-100 moles of water per mole of Al.sub.2 O.sub.3 to form a precursor mixture, admixing the precursor mixture with the structure-directing agent to form a reaction mixture, and reacting the reaction mixture under conditions such that an aluminumphosphate composition of the given X-ray diffraction pattern is formed. Metal substituted aluminumphosphate compositions having an X-ray pattern with the same characterizing d spacings can also be prepared such that oxides of one or more metals are also incorporated in the oxide lattice. Among the metals suitable for substitution are silicon, magnesium, zinc, tin, zirconium, t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.