Fixation of krypton in type-A zeolites and its leakage characteristics

Michihiro Miyake, Toru Konishi, Takashi Suzuki, Shozo Osada, Hironao Kojima

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Kr was loaded forcibly into ion-exchanged type-A zeolites (Na+-, K+-, Rb+- and Ca2+-A) by applying both high temperature (300°-500°C) and pressure (51-101 MPa) and the leakage behaviour of the fixed Kr has been investigated. The sufficient amount of Kr was successfully encapsulated into the α-cages of Na+-, K+-, and Rb+-A, although they were hydrated to some extent. The temperatures of maximum rate of Kr leakage increased with increase in the ionic radii of exchanged alkali cations, while the amount of Kr fixed in zeolites decreased. The coexistent hydrated water in the Kr-loaded type-A zeolites was found not to influence the leakage of Kr from them. It was concluded that the fixation of Kr into the α-cages of hydrated type-A zeolites is possible when the effective diameter of the 8-membered oxygen rings is reduced to narrower size by the exchangeable cations with larger ionic radii than Rb+ and the encapsulated zeolites are stored in water-free atmosphere.

Original languageEnglish
Pages (from-to)291-294
Number of pages4
Issue number3
Publication statusPublished - Jul 1984
Externally publishedYes


  • Zeolite A

ASJC Scopus subject areas

  • General Environmental Science


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