| 摘要 |
The invention provides a method of preparing zeolite Y of high degree of purity and having a silica to alumina molar ratio of from greater than 3 up to about 6.2 which comprises preparing an aluminosilicate reaction mixture having oxide molar ratios of SiO2/Al2O3, Na2O/SiO2 and H2O/Na2O lying within specified ranges, at least part of the siliceous component of the reaction mixture being a particular hydrated sodium metasilicate and then heating the reaction mixture until zeolite Y crystallizes from the reaction mixture, the particular hydrated sodium metasilicate being defined by its ability to form substantially pure zeolite X under specified conditions.
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