Thermally stable phosphate containing alumina precipitates and their method of preparation

Thermally stable phosphate containing alumina precipitates and their method of preparation

Thermally stable composite precipitates containing aluminum phosphate and alumina and having a surface area of from about 100 to about 200 m2/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 a...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: KEHL, WILLIAM L
Format: Patent
Sprache:eng
Schlagworte:
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Thermally stable composite precipitates containing aluminum phosphate and alumina and having a surface area of from about 100 to about 200 m2/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 PO4 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 AlPO4. Due to their thermal stability these alumina-aluminum phosphates are particularly useful as catalyst supports for various reactions, including polymerization of ethylene.