caa a22 4500 46580814X CHVBK 20180323112108.0 cr unu---uuuuu 170327e19900501xx s 000 0 eng 10.1007/BF00641351 doi (NATIONALLICENCE)springer-10.1007/BF00641351 Bobonich F. L. V. Pisarzhevskii Institute of Physical Chemistry, Academy of Sciences of the Ukrainian SSR, Kiev aut Chemical composition and ion exchange properties of zeolites [Elektronische Daten] [F. Bobonich] Series of exchange selectivity for alkali cations in zeolites change in a regular manner in dependence on the ratio (z) between the number of particles capable of solvating cations in the frameworks of zeolites (molecules of zeolite water, one-fourth of the framework oxygen ions) and the number of zeolite cations. For z=5-6 zeolites have maximum selectivity for large cations, for z<3-4 they selectively absorb sodium, while if z<2 they selectively absorb lithium. An analysis is given of the reasons of this dependence of the ion exchange selectivity of zeolites on the chemical composition of their frameworks. It is shown that the free energy of solvation of cations in zeolites is less than the free energy of their hydration. The effect of transformation of the selectivity series of zeolites can be connected with the contribution, on the part of the effect of redistribution of water between the solid and liquid phases of the ion exchange system, to the free energy of ion exchange reactions, which differs in dependence on the composition and structure of the crystals. Plenum Publishing Corporation, 1990 Theoretical and Experimental Chemistry Kluwer Academic Publishers 26/3(1990-05-01), 355-359 0040-5760 26:3<355 1990 26 11237 https://doi.org/10.1007/BF00641351 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00641351 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Bobonich F. L. V. Pisarzhevskii Institute of Physical Chemistry, Academy of Sciences of the Ukrainian SSR, Kiev aut NATIONALLICENCE 773 0- Theoretical and Experimental Chemistry Kluwer Academic Publishers 26/3(1990-05-01), 355-359 0040-5760 26:3<355 1990 26 11237 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer