Chemistry of inorganic compounds – Zeolite – Aging to induce zeolite formation from inorganic mixture
Patent
1997-08-28
2000-03-14
Bell, Mark L.
Chemistry of inorganic compounds
Zeolite
Aging to induce zeolite formation from inorganic mixture
423711, 423DIG21, 502 79, 95 96, 95130, C01B 3922, B01L 2018, B01J 53047
Patent
active
060369396
ABSTRACT:
A novel heat-resistant low-silica zeolite, an industrial production process, and uses of the low-silica zeolite are provided. The heat-resistant low-silica zeolite contains Si and Al in a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 ranging from 1.9 to 2.1, and has sodium and/or potassium as metal cation, wherein the low-silica zeolite contains low-silica faujasite type zeolite at a content of not lower than 88%, and has a thermal decomposition temperature ranging from 870.degree. C. to 900.degree. C. in the air. The process for producing the heat-resistant low-silica zeolite comprises mixing a solution containing an aluminate with another solution containing a silicate, allowing the resulting mixture to gel, and aging the resulting gel, at the temperature of from 0.degree. C. to 60.degree. C., to prepare a slurry having a viscosity ranging from 10 to 10000 cp and containing amorphous aluminosilicate having a specific surface area of not less than 10 m.sup.2 /g with an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio ranging from 1.9 to 2.1; and subsequently crystallizing the aluminosilicate. The low-silica zeolite ion-exchanged with lithium or an alkaline earth metal is useful for gas separation.
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Funakoshi Hajime
Harada Atsushi
Mori Takashi
Ogawa Nobuhiro
Shirakura Yoshinori
Bell Mark L.
Sample David
Tosoh Corporation
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