Obtaining of Zeolite NaY by the method of sol-gel technology: Zeolites Y is molecular sieve family Faujasite (FAU) zeolites. This zeolite has a three-dimensional porous structure (with pore sizes 7.35Å), good acid resistance and heat resistance, which makes it extremely useful as a catalyst, adsorbent and ion exchanger.
The amount of chromium retained in NaY zeolites in competitive systems is slightly smaller than in single ion-exchange systems. On the other hand, a large decrease in chromium uptake was observed in NaX zeolite. The dynamic selectivity for NaY zeolite should be written as Cr 3+ > Mg 2+, Cr 3+ > Ca 2+ and Cr 3+ > K +.
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in NaY zeolite, possibly because benzene proton spins are able to evolve only in networks corresponding to molecular benzene clusters. Figure 3a shows the average size of the spin network as a function of preparation time, N(tp), for NaY zeolite samples containing bulk average benzene loadings of one-half molecule
The powder X-ray diffractograms of NaY and heterogeneous catalysts are shown in Figure 2. These samples display the expected patterns of hydrated NaY zeolites, and no diffraction lines assigned to any new phase were detected , which indicats that the encapsulated Cu(II) complexes are highly dispersed in the zeolite structure.
Zeolites are widely used as ion-exchange beds in domestic and commercial water purification, softening, and other applications. In chemistry, zeolites are used to separate molecules (only molecules of certain sizes and shapes can pass through), and as traps for molecules so they can be analyzed.
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