| 摘要 |
<p>A faujasite polymorph has a silica to alumina mol ratio greater than 6, and contains tetrapropyl ammonium and/or tetrabutyl ammonium trapped within the supercages of said structure. A process for preparing the aluminosilicate comprises: (a) preparing a reaction mixture comprising an oxide of sodium, a tetrapropyl or tetra hydroxypropyl (or similar tetrabutyl) organic ammonium salt, water, a source of silica, a source of alumina, and sodium aluminosilicate nucleating seeds, said reaction mixture having a composition, in terms of mole ratios of oxides, within the following ranges: <TABLE> where T represents the cation of the organic ammonium template, and said seeds being present in an amount to yield 0.1 to 10 mole percent of the total final alumina content in said aluminosilicate; (b) blending the reaction mixture sufficiently to form a substantially homogeneous mixture; (c) maintaining the reaction mixture at between about 90 DEG C and 160 DEG C under autogenous pressure for a sufficient period of time to form crystals of said aluminosilicate; and (d) recovering said aluminosilicate crystals. d</p> |
