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車載用水素貯蔵材料を目指した軽金属アミド・イミド系複合物質研究の最前線
Title: | 車載用水素貯蔵材料を目指した軽金属アミド・イミド系複合物質研究の最前線 |
Other Titles: | Light Metal Amide/Imide Systems for On-Board Hydrogen Storage Materials |
Authors: | 礒部, 繁人1 Browse this author →KAKEN DB | 市川, 貴之2 Browse this author | 藤井, 博信3 Browse this author |
Authors(alt): | Isobe, Shigehito1 | Ichikawa, Takayuki2 | Fujii, Hironobu3 |
Keywords: | hydrogen strage | amide | imide | ball milling | mechanism | catalyst |
Issue Date: | Nov-2006 |
Publisher: | 日本金属学会 |
Journal Title: | 日本金属学会誌 |
Journal Title(alt): | Journal of the Japan Institute of Metals |
Volume: | 70 |
Issue: | 11 |
Start Page: | 865 |
End Page: | 869 |
Publisher DOI: | 10.2320/jinstmet.70.865 |
Abstract: | We have investigated hydrogen storage materials composed of light elements such as MgH2, Metal-N-H, Metal-C-H and Metal-B-H (Metal=Li, Na, Mg, Ca) for automobile applications. Particularly, our recent research results on H-storage properties of the metal-N-H system are reviewed in this paper. The mixture of LiH and LiNH2 catalyzed with titanium compound desorbed ~6 mass% of hydrogen in temperature ranges from 150 to 250°C under a He gas flow. However, the hydrogen desorption (H-desorption) temperature at PH2=0.1 MPa was 250°C which is too high for on-board applications. We investigated the H-desorption mechanism in the reaction from LiH+LiNH2 to Li2NH+H2 by Thermal Desorption Mass Spectroscopy (TDMS) and Fourier Transform Infrared (FT-IR) analyses for the products replaced by LiD or LiND2 for LiH or LiNH2, respectively. The results indicated that the H-desorption reaction progresses through two-step elementary reactions mediated by ammonia. On the basis of the ammonia mediated model, we successfully designed a new Li-Mg-N-H system composed of 8LiH and 3Mg(NH2)2. The mechanically milled composite desorbed ~7 mass%H2 in range from 120 to 200°C and the H-desorption pressure was higher than 5 MPa at 200°C, being suitable for on-board applications. Moreover, for understanding the role of titanium compounds as catalysts, the chemical state of the titanium compounds doped in the mixture was examined by X-ray Absorption Near-Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) measurements. |
Type: | article |
URI: | http://hdl.handle.net/2115/76283 |
Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 礒部 繁人
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