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Adsorption rate of hydrogen isotopes on Ca-mordenite

Kawamura, Yoshinori; Edao, Yuki; Yamanishi, Toshihiko

To develop an adsorbent that is suitable for a separation column of gas chromatograph for hydrogen isotope analysis, the mordenite-type zeolite of which cations (Na$$^{+}$$) were exchanged with other cations have been prepared and their hydrogen isotope adsorption behavior is being investigated. Then, it has been shown experimentally that mordenite-type zeolite of which cation has been exchanged with Ca$$^{2+}$$ (Ca-MOR) has fairly large adsorption capacity. So, breakthrough curves of H$$_{2}$$ (or D$$_{2}$$) adsorption on Ca-MOR at 194 K and 175 K have been observed and mass transfer coefficients have been estimated from them. The rate-controlling step of hydrogen adsorption is hydrogen diffusion in porous adsorbent. And, isotopic difference of effective diffusivity in Ca-MOR is larger than that in Na-MOR. Therefore, in comparison with Na-MOR, use of Ca-MOR is expected to enhance the hydrogen isotope separation capability.

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Category:Nuclear Science & Technology

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