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Preparation of amorphous silica-alumina particles by acid- treating spherical P-type zeolite particles crystallized from a sodium aluminosilicate gel
Preparation of amorphous silica-alumina particles by acid- treating spherical P-type zeolite particles crystallized from a sodium aluminosilicate gel
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° C. to 200° 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.
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