Thermally stable phosphate containing alumina precipitates and their method of preparation
US4080311A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 1976 |
| Grant date | Mar 21, 1978 |
| Priority date | — |
| Expiry date | Aug 31, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J35/647
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Thermally stable composite precipitates containing aluminum phosphate and alumina and having a surface area of from about 100 to about 200 m.sup.2 /g together with an average pore radius of from 75 to 150 A are defined. These materials are prepared by neutralizing an aqueous solution of aluminum cations and PO.sub.4 anions at a controlled pH of between 7 and 10.0, and wherein the neutralizing medium is either ammonia or certain defined amine based materials such as ammonium hydroxide, ammonium carbonate or urea. There is a stoichiometric excess of aluminum to phosphorus over that required to form AlPO.sub.4. Due to their thermal stability these alumina-aluminum phosphates are particularly useful as catalyst supports for various reactions, including polymerization of ethylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.