Zeolite and process for preparation thereof

Details Zeolite and process for preparation thereof Zeolite and process for preparation thereof

C - Chemistry, Metallurgy

01

B

252/15

C01B 33/26 (2006.01) C01B 39/30 (2006.01)

Patent

CA 1215348

- 27 - NOVEL ZEOLITE AND PROCESS FOR PREPARATION THEREOF ABSTRACT OF THE DISCLOSURE Disclosed is a zeolite having a composition of the following formula: xM2/nO?A12O3 (5-10)SiO2?yH2O wherein M is at least one cation having a valency of n, and x is 0.8 - 2 and y is 0 - 10, and exhibiting an X-ray powder diffraction pattern shown in Table 1. This zeolite is prepared by a process wherein a reaction mixture comprising a silica source, an alumina source, an alkali source, a potassium source and water and having a composition satisfying the following molar ratios: SiO2/A12O3 = 6 - 40, OH/SiO2 = 0.3 - 1, K2O/M2O = 0.1 - 0.9 (M: the total of alkali metals), and H2O/SiO2 = 10 - 70, is crystallized at 120 to 200°C with stirring. The zeolite is also prepared by a process wherein a granular amorphous aluminosilicate containing aluminum in an amount of 4 to 22 wt.% as A12O3 (on the anhydrous base), which is obtained by reacting an aqueous alkali metal silicate solution with an aqueous aluminum-containing solution, is incorporated in an aqueous alkali metal hydroxide solution and/or an aqueous alkali metal silicate solution, to form a mixture having a composition defined by the above- -mentioned molar ratios, and the mixture is crystallized with stirring.

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