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Adsorption behavior of hydrogen isotopes on mordenite adsorbents at 77K

77Kにおけるモルデナイト吸着材の水素同位体吸着挙動

宗像 健三*; 河村 繕範

Munakata, Kenzo*; Kawamura, Yoshinori

低温吸着法はヘリウム中の低濃度水素同位体の回収に有効で、核融合炉トリチウム増殖ブランケットのスイープガスからのトリチウム回収への適用が検討されている。筆者らはヘリウム中の水素同位体回収により適した吸着材を求め、スクリーニングテストを行い、天然モルデナイトの吸着容量が大きいことを見いだした。そして、破過曲線解析から吸着速度を定量したところ、細孔内拡散速度がMS5Aとほぼ同等であることがわかった。これより、天然モルデナイトは吸着速度において、ヘリウム中の低濃度水素同位体の回収に適していることがわかった。

Cryogenic adsorption is effective for the recovery of hydrogen isotopes of small concentrations from the bulk helium gas. Thus, the cryogenic adsorption method is considered to be applied to the recovery of tritium from the blanket sweep gas which recovers tritium from ceramic breeder materials. The authors performed a screening test to find more suitable adsorbents for the recovery of hydrogen isotopes from the bulk helium gas at 77K. The screening test indicates that a natural mordenite adsorbent has a quite high adsorption capacity for hydrogen under the helium atmosphere. The adsorption rate of hydrogen isotopes was quantified by analyzing breakthrough curves obtained in the experiments. Evaluated effective pore diffusivities of hydrogen isotopes in the mordenite adsorbents are comparable to that in MS5A adsorbents. Thus, it can be said that mordenite adsorbents are also suitable for adsorption of hydrogen isotopes from the viewpoint of adsorption rates.

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パーセンタイル:28.8

分野:Nuclear Science & Technology

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