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Physicochemical properties of alkali-metal exchanged type X zeolites

Abstract

The changes in the physicochemical properties of a series of faujasite type X zeolites cation exchanged with K+, Rb+ and Cs+ have been studied by XRD, IR, thermoanalytical methods and sorption measurements. As a consequence of the enhanced scattering of X-rays by larger alkali metal cations, the percent relative intensity of the XRD peaks of cation exchanged zeolites was found to have decreased considerably. The framework IR spectra also showed analogous changes. The alkali metal exchange was found to enhance the thermal stability of the parent zeolite. The available void volume and specific surface area (obtained by low temperature nitrogen sorption) also decreased with the increase in the degree of exchange and cationic size. Equilibrium sorption capacities (298 K andP/P 0=0.5) for water,n-hexane, cyclohexane and 1,3,5-trimethylbenzene also exhibited the same trend.

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Correspondence to V. P. Shiralkar.

Additional information

NCL communication no. 6056.

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Tamhankar, S.S., Shiralkar, V.P. Physicochemical properties of alkali-metal exchanged type X zeolites. J Incl Phenom Macrocycl Chem 17, 221–235 (1994). https://doi.org/10.1007/BF00708782

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Key words

  • Alkali metal exchanged X zeolites
  • structural
  • thermal and sorption properties