The combination of
hydrogen oxidation reactor packed noble
metal catalysts and
water vapor absorber has been applied to the atmospheric detritiation system of the
tritium handling facility. Commercial synthetic
zeolite such as molecular sieve 5A has been used as an adsorbent of ADS absorber. In the case of application of molecular sieve 5A to the ADS absorber of a large-scale
tritium handling facility such as a future fusion plant, an absorber becomes huge due mainly to the difficulty in
dehydration from molecular sieve 5A. Hence, application of CaY
Faujasite-type
zeolite with a high framework
silica-to-
alumina ratio to the adsorbent for atmospheric detritiation system was investigated. It was clear that the
dehydration behavior at room temperature was significantly improved using CaY
zeolite. In contrast, detritiation factor for CaY
zeolite with a high framework
silica-to-
alumina ratio depended strongly on the space velocity through the absorber. To apply CaY
zeolite with a high framework SiO(2)/Al(2)O(3) ratio to the ADS absorbent, the space velocity less than 250h(-1) was recommended to maintain the detritiation factor more than 1000. The steep increase in water adsorption at the relative pressure lower than 0.05 is a feature of synthetic
zeolite with
calcium cation. However, such an increase was not observed in water adsorption on CaY
zeolite with a framework SiO(2)/Al(2)O(3) ratio more than 7.0. Consequently, the CaY
zeolite with the framework SiO(2)/Al(2)O(3) ratio of 5.0 is a promising candidate as absorbent of ADS absorber.