Preparation of amorphous silica-alumina particles by acid-treati

Details Preparation of amorphous silica-alumina particles by acid-treati Preparation of amorphous silica-alumina particles by acid-treati

1991-06-18

1993-08-17

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

4233282, 4233291, 4233301, 423710, 502 68, 502 85, C01B 3326

Patent

active

052366804

ABSTRACT:
The invention is a process for preparing amorphous silica alumina spherical particles by mixing sodium silicate or silicic acid gel with sodium aluminate and sodium hydroxide in an aqueous solution to form a gel, homogenizing the formed gel, crystallizing this intermediate product at 85.degree. C. to 200.degree. under atmospheric pressure or under hydrothermal conditions to form spherical zeolite particles with an x-ray diffraction pattern inherent to P-type zeolites and with a notched surface, treating the zeolite particles with acid to remove the sodium, thereby rendering the particles amorphous.

REFERENCES:
patent: 4440958 (1984-04-01), Gregory et al.
patent: 4576805 (1986-03-01), Chang et al.
patent: 4752458 (1988-06-01), Robinson
patent: 4775520 (1988-10-01), Unger
patent: 4925613 (1990-05-01), Harada et al.
patent: 4929431 (1990-05-01), Hagiwara et al.

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