TY - JOUR
T1 - Effect of Ti catalyst with different chemical form on Li-N-H hydrogen storage properties
AU - Isobe, S.
AU - Ichikawa, T.
AU - Hanada, N.
AU - Leng, H. Y.
AU - Fichtner, M.
AU - Fuhr, O.
AU - Fujii, H.
N1 - Funding Information:
This work was supported by a Grant-in-Aid for COE Research (No. 13CE2002) of the Ministry of Education, Sciences and Culture of Japan and the New Energy and Industrial Technology Development Organization (NEDO), Japan.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005/12/8
Y1 - 2005/12/8
N2 - The effect of some different type Ti additives on kinetics of the reaction, LiH+LiNH2↔Li2NH+H2, was intensively investigated in this work. The mixture of LiH and LiNH2 powders with the 1:1 molar ratio and Ti additives with different chemical form were mechanically ball milled under a hydrogen gas atmosphere of 1 MPa at 400 rpm for 2 h and the measurements of thermal hydrogen desorption spectrum (TDS), thermogravimetry (TG) and X-ray diffraction (XRD) were performed. Here, we used Ti (nano particle), Ti (micro particle), TiCl 3, TiO2 (nano particle) and TiO2 (micro particle) as the additives. The results indicated that the Tinano, TiCl3 and TiO2nano doped composites revealed a superior catalytic effect on the TDS properties, while the Timicro and TiO2micro did not show so good catalytic effect being similar to the sample without any additives. In the XRD profiles, there are traces of Ti and TiO2 phases in the Timicro and TiO2micro doped composites, respectively, whereas no trace of Ti, TiCl3 and TiO2 was found in the Tinano, TiCl3 and TiO2nano doped composites. These results indicate that the uniform distribution of nano particle Ti metal between LiH and LiNH2 plays an important role for catalytic effect.
AB - The effect of some different type Ti additives on kinetics of the reaction, LiH+LiNH2↔Li2NH+H2, was intensively investigated in this work. The mixture of LiH and LiNH2 powders with the 1:1 molar ratio and Ti additives with different chemical form were mechanically ball milled under a hydrogen gas atmosphere of 1 MPa at 400 rpm for 2 h and the measurements of thermal hydrogen desorption spectrum (TDS), thermogravimetry (TG) and X-ray diffraction (XRD) were performed. Here, we used Ti (nano particle), Ti (micro particle), TiCl 3, TiO2 (nano particle) and TiO2 (micro particle) as the additives. The results indicated that the Tinano, TiCl3 and TiO2nano doped composites revealed a superior catalytic effect on the TDS properties, while the Timicro and TiO2micro did not show so good catalytic effect being similar to the sample without any additives. In the XRD profiles, there are traces of Ti and TiO2 phases in the Timicro and TiO2micro doped composites, respectively, whereas no trace of Ti, TiCl3 and TiO2 was found in the Tinano, TiCl3 and TiO2nano doped composites. These results indicate that the uniform distribution of nano particle Ti metal between LiH and LiNH2 plays an important role for catalytic effect.
KW - Gas-solid reactions
KW - High-energy ball milling
KW - Hydrogen storage materials
KW - Nanostructures
KW - Thermal analysis
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U2 - 10.1016/j.jallcom.2004.09.081
DO - 10.1016/j.jallcom.2004.09.081
M3 - Article
AN - SCOPUS:28144457887
VL - 404-406
SP - 439
EP - 442
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
SN - 0925-8388
IS - SPEC. ISS.
ER -