Crystalline zeolites and method of preparation from amorphous silica particles
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United States of America Patent
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Jan 4, 1994
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N/A
app pub date -
Dec 30, 1992
filing date -
Dec 30, 1992
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Expired
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Abstract
Zeolite is synthesized by reacting amorphous silica particles with NaOH and Al.sub.2 O.sub.3 under hydrothermal reaction conditions. The amorphous silica particles are preferably produced by reaction of fluosilicic acid and alumina to form aluminum fluoride and silica. The silica particles contain some residual fluorine and aluminum, and their surface area is about 1 to 3 m.sup.2 /g. Mordenite and ZSM-5 zeolites are obtained in preferred embodiments of the invention.
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