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Iwai, Yasunori; Kubo, Hitoshi*; Oshima, Yusuke*
Isotope News, (736), p.12 - 17, 2015/08
We have successfully developed a new hydrophobic platinum catalyst for collecting tritium at nuclear fusion reactors. Catalysts used to collect tritium are called hydrophobic precious metal catalysts. In Japan, hydrophobic precious metal catalysts manufactured from polymers have been used for heavy water refinement.However, this catalyst has issues related to embrittlement to radiation and thermal stability. These technological issues needed to be solved to allow for its application to nuclear fusion reactors requiring further enrichment from highly-concentrated tritiated water. We developed a new method of manufacturing catalysts involving hydrophobic processing with an inorganic substance base. As a result, previous technological issues were able to be solved with the development of a catalyst that exhibited no performance degradation in response to radiation application of 530kGy, a standard for radiation resistance, and maintenance of thermal stability at over 600C, which is much higher than the 70C temperature that is normally used. The catalyst created with this method was also confirmed to have achieved the world's highest exchange efficiency, equivalent to 1.3 times the previously most powerful efficiency. The application of this catalyst to the liquid phase catalytic exchange process is expected to overcome significant technological hurdles with regards to improving the reliability and efficiency of systems for collecting tritium from tritiated water.
Iwai, Yasunori; Kubo, Hitoshi*; Oshima, Yusuke*
Kagaku, 70(5), p.35 - 40, 2015/05
We have successfully developed a new hydrophobic platinum catalyst for collecting tritium at nuclear fusion reactors. Catalysts used to collect tritium are called hydrophobic precious metal catalysts. In Japan, hydrophobic precious metal catalysts manufactured from polymers have been used for heavy water refinement. However, this catalyst has issues related to embrittlement to radiation and thermal stability. These technological issues needed to be solved to allow for its application to nuclear fusion reactors requiring further enrichment from highly-concentrated tritiated water. We developed a new method of manufacturing catalysts involving hydrophobic processing with an inorganic substance base. As a result, previous technological issues were able to be solved with the development of a catalyst that exhibited no performance degradation in response to radiation application of 530 kGy, a standard for radiation resistance, and maintenance of thermal stability at over 600C, which is much higher than the 70C temperature that is normally used. The catalyst created with this method was also confirmed to have achieved the world's highest exchange efficiency, equivalent to 1.3 times the previously most powerful efficiency. The application of this catalyst to the liquid phase catalytic exchange process is expected to overcome significant technological hurdles with regards to improving the reliability and efficiency of systems for collecting tritium from tritiated water.
Yamanishi, Toshihiko; Iwai, Yasunori; Kawamura, Yoshinori; Nishi, Masataka
Fusion Engineering and Design, 81(1-7), p.797 - 802, 2006/02
Times Cited Count:9 Percentile:53.38(Nuclear Science & Technology)no abstracts in English
Tamura, Koji
Kagaku To Kyoiku, 46(7), p.414 - 417, 1998/07
no abstracts in English
Yamanishi, Toshihiko; Okuno, Kenji
JAERI-Data/Code 96-028, 32 Pages, 1996/09
no abstracts in English
Yamanishi, Toshihiko; Okuno, Kenji
Fusion Technology, 28(3), p.1597 - 1602, 1995/10
no abstracts in English
Yamai, Hideki*; Konishi, Satoshi; Hara, Masahide*; Okuno, Kenji; Yamamoto, Ichiro*
Fusion Technology, 28(3), p.1591 - 1596, 1995/10
no abstracts in English
Yamanishi, Toshihiko; Iwai, Yasunori; Okuno, Kenji
JAERI-Research 95-058, 22 Pages, 1995/09
no abstracts in English
Yamanishi, Toshihiko; Okuno, Kenji
JAERI-Data/Code 94-019, 29 Pages, 1994/12
no abstracts in English
Yamai, Hideki*; Konishi, Satoshi; Yamanishi, Toshihiko; Okuno, Kenji
Fusion Technology, 26(3), p.654 - 658, 1994/11
no abstracts in English
*; *;
J.Chem.Eng.Jpn., 16(5), p.370 - 377, 1983/00
Times Cited Count:24 Percentile:83.93(Engineering, Chemical)no abstracts in English
; Naruse, Yuji; Shiba, Koreyuki
Nuclear Technology, 62, p.317 - 323, 1983/00
Times Cited Count:2 Percentile:35.16(Nuclear Science & Technology)no abstracts in English
Fujine, Sachio; Saito, Keiichiro; Shiba, Koreyuki; Itoi, T.*
Sep.Sci.Technol., 17(13-14), p.1545 - 1563, 1983/00
no abstracts in English
; Saito, Keiichiro; Shiba, Koreyuki
Sep.Sci.Technol., 18(1), p.15 - 31, 1983/00
Times Cited Count:16 Percentile:77.49(Chemistry, Multidisciplinary)no abstracts in English
; Saito, Keiichiro; Shiba, Koreyuki
Sep.Sci.Technol., 17(11), p.1309 - 1325, 1982/00
Times Cited Count:12 Percentile:73.36(Chemistry, Multidisciplinary)no abstracts in English