Structure and Chemical Composition of the New Zeolite ISC-1 from the Data of Nanocluster Modeling

The cluster analysis and modeling of self-assembly of the crystal structures of zeolites, i.e., zeolite RHO, paulingite PAU, and hypothetical zeolite ISC-1 separated as a local structure in the paulingite framework, have been performed. It has been established using the tiling method that the RHO, PAU, and ISC-1 frameworks contain two, seven, and five topological types of cavities, which are occupied by extraframework cations and/or water molecules. The zeolite structures have been described as ensembles of nanoclusters that represent local regions of the tetrahedral T framework and uniquely determine the topological features of the framework. The structure of the synthesized paulingite-Na, K, TEA (where TEA is tetraethylammonium) has been analyzed using X-ray powder diffraction. The chemical formula of the ISC-1 zeolite in the form Na(14)K(24)Al(38)Si(202)O(480 center dot)nH(2)O has been proposed from the data on the composition and structure of paulingite (minerals and synthetic phases).