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

doi:10.1021/jp049968y

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

64 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 language	English
Pages (from-to)	7887-7892
Number of pages	6
Journal	Journal of Physical Chemistry B
Volume	108
Issue number	23
DOIs	https://doi.org/10.1021/jp049968y
Publication status	Published - 2004 Jun 10
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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@article{176cf69cb5064627afdfaff6fe54381d,

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

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.",

author = "Takayuki Ichikawa and Nobuko Hanada and Shigehito Isobe and Haiyan Leng and Hironobu Fujii",

year = "2004",

month = jun,

day = "10",

doi = "10.1021/jp049968y",

language = "English",

volume = "108",

pages = "7887--7892",

journal = "Journal of Physical Chemistry B",

issn = "1089-5647",

number = "23",

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T1 - Mechanism of novel reaction from LiNH2 and LiH to Li 2NH and H2 as a promising hydrogen storage system

AU - Ichikawa, Takayuki

AU - Hanada, Nobuko

AU - Isobe, Shigehito

AU - Leng, Haiyan

AU - Fujii, Hironobu

PY - 2004/6/10

Y1 - 2004/6/10

N2 - 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.

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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JF - Journal of Physical Chemistry B

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

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