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These channels allow the easy drift of the resident ions and molecules into and out of the structure.The aluminosilicate framework is negatively charged and attracts the positive cations that reside in cages to compensate negative charge of the framework.The discovery in 1957 of largedeposits of relatively high purity zeolite minerals in volcanic tuffs in the western United States and in a number of other countries represents the beginning of the commercial natural zeolite era. These are molecular sieve zeolites with Si/Al ratious from 10 to 100 or higher, with different surface characteristics. Prior to that time there was no recognized indication that zeolite minerals with properties useful as molecular sieve materials occurred in large deposits. In contrast to the "low" and "intermediate" silica zeolites, representing heterogeneous hydrophilic surfaces within a porous crystal, the surface of the high silica zeolites is more homogeneous with an organophilic-hydrophobic selectivity [19]. In the early 1950's it was recognized by Union Carbide Laboratories scientists that the tetrahedral aluminum positions in the zeolite frameworks provide a site of instability for attack by acid and water vapor of steam that make synthetic zeolites A and X less stable than their natural analogs, which have superior stability characteristics reflecting higher Si/Al molar ratio of 3-5. Acara with a Si/Al = 3.0 have unique framework topology. Many commercial washing powders thus contain substantial amounts of zeolites that enhance washing efficiency. The framework is represented by tiles assembly showing straight channels in the structure.

Zoliphe-90Zoliphe-16

The naturally occurring zeolites are an important group of minerals for industrial and other purposes [18].

At present, there are 191 unique zeolite frameworks identified[1], and over 40 naturally occurring zeolite frameworks are known.

Zeolites were introduced in 1954 as adsorbents for industrial separations and purifications.

These tetrahedra are linked together by their corners and make a rich variety of beautiful structures.

The framework structure may contain linked cages, cavities or channels, which are big enough to allow small molecules to enter.




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