| 摘要 |
Disclosed is a zeolite having a composition of the following formula: xM2/nO.Al2O3.(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/Al2O3=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 DEG to 200 DEG 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 Al2O3 (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. |
