| Project/Area Number |
17K00627
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Environmental conscious materials and recycle
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| Research Institution | Hiroshima University |
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Principal Investigator |
Kojima Yoshitsugu 広島大学, 自然科学研究支援開発センター, 教授 (20394546)
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| Co-Investigator(Kenkyū-buntansha) |
中川 鉄水 琉球大学, 理学部, 助教 (50647261)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 水素貯蔵材料 / アンモニアボラン / 再水素化 / 水素化リチウム / 金属アミドボラン / アンモニア / ヒドラジン / 水素貯蔵 / 環境材料 / 水素 |
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| Outline of Final Research Achievements |
Lithium amidoborane (LiAB), which was synthesized by reacting lithium hydride (LiH) with ammonia borane (AB), was dehydrogenated by heating to obtain several conditions of spent fuels. These 1-2 eq.H2 dehydrogenated products were reacted with hydrazine and ammonia in order to obtain the intermediates of regeneration. As a result of investigating reacted products by using 11B-NMR measurement, X-ray diffraction (XRD) and infrared spectroscopy, BH3 species are observed after both soaking liquid NH3 and hydrazine. This result stands for that the similar reaction route with regeneration of AB proceeds in the case of LiAB. On the other hand, KAB (KNH2BH3) and CaAB (Ca(NH2BH3)2) also recovered BH3 bonds although their regeneration was incomplete. Hence, regeneration of KAB and CaAB is possible but more investigation to find proper regeneration condition is required.
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| Academic Significance and Societal Importance of the Research Achievements |
金属アミドボラン（MAB）は水素貯蔵量が多いことから水素貯蔵材料として期待されている。しかしながら、再生メカニズムが不明な問題がある。本研究ではリチウムアミドボラン（LiAB）から水素放出後に生成する副生成物の水素再充填（再生）メカニズム解明に成功した。更に金属アミドボランのうちカリウムアミドボラン（KAB）とカルシウムアミドボラン（CaAB）の単相合成に成功し、これらが再生可能であるという証拠を突き止めた。上記の成果は再生反応の法則性を理解する手がかりとなり、本研究で用いた再生法がアミドボラン系にも汎用的な手法であることの証明にもなった。
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