Process for preparation of synthetic faujasite molded body
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United States of America Patent
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May 15, 1990
Grant Date -
N/A
app pub date -
Dec 12, 1986
filing date -
Dec 13, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A synthetic faujasite molded body having high purity and high crystallinity is prepared with a good reproducibility by a process wherein a structure-inducing substance is incorporated in a starting material mixture comprising as main components a silica source, an alumina source, an alkali source and water; the mixture is kneaded and molded into a desired shape; and the molded body is heated in an aqueous solution of an alkali metal silicate or hydroxide. The structure-inducing material has a composition defined by the following oxide molar ratios: SiO.sub.2 /Al.sub.2 O.sub.2 =14 to 60, M.sub.2 O/Al.sub.2 O.sub.3 =15 to 40 and H.sub.2 O/M.sub.2 O=12 to 40 (M=alkali metal), and is prepared by mixing together an aqueous alkali metal silicate solution, an aqueous alkali metal aluminate solution and an aqueous alkali metal hydroxide solution to prepare a liquid phase substance having a composition defined by the following oxide molar ratios: SiO.sub.2 /Al.sub.2 O.sub.3 =8 to 14, M.sub.2 O/Al.sub.2 O.sub.3 =7 to 30, and H.sub.2 O/M.sub.2 O=10 to 14, aging the liquid phase substance at 20.degree. to 60.degree. C. for 10 minutes to 6 hours; and incorporating an aqueous alkali metal silicate solution into the aged liquid phase substance.
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