R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy

[R2-08] High-temperature single-crystal X-ray diffraction study of Cs-exchanged chabazite: a crystallographic study on dehydration behavior

[Presentation award entry]

*Naomi Kawata^1,2, Keiko Fujiwara¹, Makio Ohkawa³, Akihiko Nakatsuka¹ (1. Yamaguchi Univ. Sci. Tech. Innov., 2. Hiroshima Univ. N-BARD, 3. Hiroshima Univ. Sci. Eng.)

Keywords:zeolite, chabazite, high-temperature single-crystal X-ray diffraction, dehydration, ion exchange

To research a key factor of an excellent ability of chabazite as ion-exchangers, we conducted the high-temperature single-crystal X-ray diffraction study of a Cs-exchanged chabazite. Our previous study reported that the occupancies of the exchangeable cations in non-exchanged chabazite changed drastically with their migration. However, in the present study, the occupancy of Cs site in the Cs-exchanged chabazite almost unchanged with heating, indicating that Cs⁺ strongly prefers a specific cation site in contrast to other exchangeable-cations such as Ca²⁺.