Hydrogen desorption mechanism in a Li-N-H system by means of the isotopic exchange technique

Shigehito Isobe; Takayuki Ichikawa; Satoshi Hino; Hironobu Fujii

doi:10.1021/jp051889e

Hydrogen desorption mechanism in a Li-N-H system by means of the isotopic exchange technique

J Phys Chem B. 2005 Aug 11;109(31):14855-8. doi: 10.1021/jp051889e.

Authors

Shigehito Isobe¹, Takayuki Ichikawa, Satoshi Hino, Hironobu Fujii

Affiliation

¹ Department of Quantum Matter, ADSM, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan.

PMID: 16852881
DOI: 10.1021/jp051889e

Abstract

The hydrogen desorption mechanism in the reaction from LiH + LiNH2 to Li2NH + H2 was examined by thermal desorption mass spectrometry, thermogravimetric analysis, and Fourier transform IR analyses for the products replaced by LiD or LiND2 for LiH or LiNH2, respectively. The results obtained indicate that the hydrogen desorption reaction proceeds through the following two-step elementary reactions mediated by ammonia: 2LiNH2 --> Li2NH + NH3 and LiH + NH3 --> LiNH2 + H2, where hydrogen molecules are randomly formed from four equivalent hydrogen atoms in a hypothetical LiNH4 produced by the reaction between LiH and NH3 according to the laws of probability.