| 摘要 |
PURPOSE:To produce the titled zeolite having improved utility of a silica source and an alkali source, by selecting the composition of an aqueous reaction mixture to which the second alumina source is added, the timing of the addition, the kind of the second alumina source, and the amount of the source. CONSTITUTION:An aqueous reaction mixture having an oxide molar ratio of SiO2/Al2O3=3-20, M2O/Al2O3=2-6 (M is alkali metal) and H2O/Al2O3=50-300 is prepared, heated at >=50 deg.C, and added with the second alumina source to complete the crystallization of the crystalline aluminosilicate zeolite. The produced crystal is recovered to obtain the titled zeolite. The amount of the second alumina source added to the mixture is preferably <=100% of the alumina existing in the above aqueous reaction mixture.
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