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US 4,226,743 AGranted
Silica-alumina hydrogel catalyst
AssigneeW. R. Grace & Co.
InventorsMark A. Seese, Edwin W. Albers, John S. Magee, Jr.
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Abstract
A dense, attrition resistant catalyst is prepared by precipitating a silica alumina hydrogel at high pH, and subsequently reacting the alkaline hydrogel with sufficient acid aluminum salt at a pH below 4 to obtain an acidic hydrogel slurry. The slurry is then processed into a catalyst by spray drying, washing and ion exchanging. The catalyst may include substantial quantities of clay and/or crystalline aluminosilicate zeolites.
Claims8
A process for preparing a silica-alumina hydrogel catalyst which comprises:
- (a) reacting solutions of sodium silicate and acid aluminum salt at a pH of about 9.0 to 9.6 to obtain a silica-alumina cogel;
- (b) reacting said silica-alumina cogel with sodium aluminate solution to obtain an alkaline gel slurry having a pH of about 11.8 to 12.3;
- (c) reacting said gel slurry with an acid aluminum salt to obtain an acid gel slurry having a pH of below 4;
- (d) reacting said acid gel slurry with a base to precipitate alumina and to obtain a silica-alumina hydrogel catalyst slurry having a pH of about 4.5 to 6;
- (e) recovering the hydrogel from said slurry;
- and
- (f) washing, forming and drying said hydrogel to obtain dense, attrition resistant catalyst particles.
4 more elements
Dependencies are inferred from the claim text.