Thermally stable phosphate containing alumina precipitates...

Details Thermally stable phosphate containing alumina precipitates... Thermally stable phosphate containing alumina precipitates...

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B01J 27/14 (2006.01) B01J 27/16 (2006.01) B01J 37/03 (2006.01) C01B 25/36 (2006.01) B01J 35/10 (2006.01)

Patent

CA 1073435

THERMALLY STABLE PHOSPHATE CONTAINING ALUMINA PRECIPITATES AND THEIR METHOD OF PREPARATION Abstract of the Disclosure 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 .ANG. 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 gas 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 particu- larly useful as catalyst supports for various reactions, including polymerization of ethylene.

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