Mechanism of novel reaction from LiNH2 and LiH to Li 2NH and H2 as a promising hydrogen storage system

Takayuki Ichikawa, Nobuko Hanada, Shigehito Isobe, Haiyan Leng, Hironobu Fujii

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276 Citations (Scopus)

Abstract

The mechanism of the hydrogen desorption (HD) reaction from the 1:1 mixture of lithium amide (LiNH2) and lithium hydride (LiH) to lithium imide (Li2NH) and hydrogen (H2) has been proposed on the basis of our experimental results in this paper. The proposed model is constituted by 2 kinds of elementary reactions: the one is that 2LiNH2 decomposes to Li2NH and ammonia (NH3), the other is that the emitted NH3 reacts with LiH and transforms into LiNH2 and H 2. Since the former and the latter reactions are, respectively, endothermic and exothermic, the HD reaction corresponding to the latter reaction occurs as soon as LiNH2 has decomposed into Li2NH and NH3. Therefore, the HD reaction can be understood by the following processes: at the first step, LiNH2 decomposes into Li 2NH/2 + NH3/2, and then the emitted NH3/2 quickly reacts with LiH/2, transforming into LiNH2/2 + H 2/2; at the second one, the produced LiNH2/2 decomposes to Li2NH/4 + NH3/4, and then NH3/4 + LiH/4 transform to LiNH2/4 + H2/4, and such successive steps continue until LiNH2 and LiH completely transform into Li 2NH and H2, even at low temperatures, by the catalytic effect of TiCl3.

Original languageEnglish
Pages (from-to)7887-7892
Number of pages6
JournalJournal of Physical Chemistry B
Volume108
Issue number23
DOIs
Publication statusPublished - 2004 Jun 10
Externally publishedYes

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lithium hydrides
Hydrogen storage
Lithium
Hydrides
Hydrogen
hydrogen
desorption
Desorption
lithium
Imides
imides
amides
ammonia
Amides
Ammonia
Temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Mechanism of novel reaction from LiNH2 and LiH to Li 2NH and H2 as a promising hydrogen storage system. / Ichikawa, Takayuki; Hanada, Nobuko; Isobe, Shigehito; Leng, Haiyan; Fujii, Hironobu.

In: Journal of Physical Chemistry B, Vol. 108, No. 23, 10.06.2004, p. 7887-7892.

Research output: Contribution to journalArticle

Ichikawa, Takayuki ; Hanada, Nobuko ; Isobe, Shigehito ; Leng, Haiyan ; Fujii, Hironobu. / Mechanism of novel reaction from LiNH2 and LiH to Li 2NH and H2 as a promising hydrogen storage system. In: Journal of Physical Chemistry B. 2004 ; Vol. 108, No. 23. pp. 7887-7892.
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abstract = "The mechanism of the hydrogen desorption (HD) reaction from the 1:1 mixture of lithium amide (LiNH2) and lithium hydride (LiH) to lithium imide (Li2NH) and hydrogen (H2) has been proposed on the basis of our experimental results in this paper. The proposed model is constituted by 2 kinds of elementary reactions: the one is that 2LiNH2 decomposes to Li2NH and ammonia (NH3), the other is that the emitted NH3 reacts with LiH and transforms into LiNH2 and H 2. Since the former and the latter reactions are, respectively, endothermic and exothermic, the HD reaction corresponding to the latter reaction occurs as soon as LiNH2 has decomposed into Li2NH and NH3. Therefore, the HD reaction can be understood by the following processes: at the first step, LiNH2 decomposes into Li 2NH/2 + NH3/2, and then the emitted NH3/2 quickly reacts with LiH/2, transforming into LiNH2/2 + H 2/2; at the second one, the produced LiNH2/2 decomposes to Li2NH/4 + NH3/4, and then NH3/4 + LiH/4 transform to LiNH2/4 + H2/4, and such successive steps continue until LiNH2 and LiH completely transform into Li 2NH and H2, even at low temperatures, by the catalytic effect of TiCl3.",
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AU - Ichikawa, Takayuki

AU - Hanada, Nobuko

AU - Isobe, Shigehito

AU - Leng, Haiyan

AU - Fujii, Hironobu

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AB - The mechanism of the hydrogen desorption (HD) reaction from the 1:1 mixture of lithium amide (LiNH2) and lithium hydride (LiH) to lithium imide (Li2NH) and hydrogen (H2) has been proposed on the basis of our experimental results in this paper. The proposed model is constituted by 2 kinds of elementary reactions: the one is that 2LiNH2 decomposes to Li2NH and ammonia (NH3), the other is that the emitted NH3 reacts with LiH and transforms into LiNH2 and H 2. Since the former and the latter reactions are, respectively, endothermic and exothermic, the HD reaction corresponding to the latter reaction occurs as soon as LiNH2 has decomposed into Li2NH and NH3. Therefore, the HD reaction can be understood by the following processes: at the first step, LiNH2 decomposes into Li 2NH/2 + NH3/2, and then the emitted NH3/2 quickly reacts with LiH/2, transforming into LiNH2/2 + H 2/2; at the second one, the produced LiNH2/2 decomposes to Li2NH/4 + NH3/4, and then NH3/4 + LiH/4 transform to LiNH2/4 + H2/4, and such successive steps continue until LiNH2 and LiH completely transform into Li 2NH and H2, even at low temperatures, by the catalytic effect of TiCl3.

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