Abstract
Abstract An Experimental Charge Density Matching (ECDM) approach to zeolite synthesis is described. The method features the initial formation of a Charge Density Mismatch (CDM) aluminosilicate reaction mixture characterized by the mismatch between the charge density on the organoammonium structure directing agent (SDA) and the charge density on the potential aluminosilicate network that is expected to form. This amounts to creating an aluminosilicate reaction mixture using a large SDA and a low Si/A1 ratio, but also depends on hydroxide levels and crystallization temperature. The crystallization of a zeolite from such a reaction mixture may be difficult, or even impossible. Crystallization can be induced by the controlled addition of supplemental SDA's that have charge densities that are more suitably matched to that of the desired low ratio aluminosilicate network. Advantages of this approach are greater control over the crystallization process and reliable cooperation of multiple templates. The approach is demonstrated in the TEA-TMA template system, in which the new zeolites UZM-4, UZM-5, and UZM-9 are synthesized.
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