Process for preparing silica-alumina

Details Process for preparing silica-alumina Process for preparing silica-alumina

1986-05-23

1987-12-08

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Silicon containing or process of making

502263, B01J 2112

Patent

active

047118687

ABSTRACT:
A process for preparing silica-alumina compositions comprises mixing a first aqueous solution containing an aluminum salt (preferably KAl(SO.sub.4).sub.2) and an ammonium salt (preferably (NH.sub.4).sub.2 SO.sub.4) with a second solution containing an alkali metal silicate (preferably Na.sub.2 SiO.sub.3), wherein the mol ratio of the alkali metal silicate to the aluminum salt is in the range of from about 2:1 to about 20:1, and the concentration of the ammonium salt is chosen so as to afford coprecipitation of silica-alumina hydrogel (preferably at a pH of about 3-6). The thus coprecipitated silica-alumina hydrogel can be separated from the mixture of the two solutions, optionally washed, and calcined so as to prepare acidic silica-alumina suitable as cracking catalyst material.

REFERENCES:
patent: Re23438 (1951-12-01), Ryland
patent: 2395524 (1946-02-01), Weiser et al.
patent: 2428895 (1947-10-01), Shoeld
patent: 2437533 (1948-03-01), Huffman
patent: 2448860 (1951-04-01), Bond, Jr.
patent: 2595339 (1952-05-01), Den Herder et al.

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