Process for preparation of ferrierite type zeolites

Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing

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423118, 423329, 423330, 502 60, 502 77, C01B 3328

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046506543

ABSTRACT:
A ferrierite type zeolite having a high purity and a high SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio is prepared by reacting simultaneously and continuously an aqueous sodium and/or potassium silicate solution with an aluminum-containing solution to obtain a homogeneous phase compound of a granular amorphous aluminosilicate containing Al in an amount of 3 to 14 wt. % as calculated as anhydrous Al.sub.2 O.sub.3 and Na and/or K in an amount of 1 to 17 wt. % as calculated as anhydrous Na.sub.2 O and/or K.sub.2 O; and then, crystallizing the homogeneous phase compound in the form of a slurry in water or in an aqueous sodium hydroxide and/or potassium hydroxide solution. The molar ratio of K.sup.+ to the total of (K.sup.+ +Na.sup.+) in the slurry is 0.1 to 0.9.

REFERENCES:
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patent: 3933974 (1976-01-01), Winquist
patent: 3966883 (1976-06-01), Vaughan et al.
patent: 4017590 (1977-04-01), Cormier et al.
patent: 4046859 (1977-09-01), Plank et al.
patent: 4530824 (1985-07-01), Arika et al.
Kibby et al, "Journal of Catalyst", 35, 1974, pp. 256-277.

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