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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Study the effects of mechanical activation on Li-N-H systems with H-1 and Li-6 solid-state NMR

Cited 20 times inthomson ciCited 19 times inthomson ci
Title
Study the effects of mechanical activation on Li-N-H systems with H-1 and Li-6 solid-state NMR
Other Titles
Study the effects of mechanical activation on Li-N-H systems with H-1 and Li-6 solid-state NMR
Author
Lu, ChunHu, JianzhiKwak, JahunYang, ZhenguoRen, RuimingMarkmaitree, TippawanShaw, Leon L.
Keywords
HYDROGEN STORAGE PROPERTIES; LITHIUM HYDRIDE; AMIDE; TEMPERATURE; IMIDE; LINH2
Issue Date
2007-07
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.170, no.2, pp.419 - 424
Abstract
To gain insight into the effects of mechanical activation (MA) on the hydrogen desorption of the lithium amide (LiNH2) and lithium hydride (LiH) mixture. LiNH2 and LiH + LiNH2 were mechanically activated by high-energy ball milling. The formed products were studied with in situ H-1 and Li-6 nuclear magic angle spinning (MAS) magnetic resonance (NMR) spectroscopy from ambient temperature to 180 degrees C. Up-field chemical shift was observed in Li-6 MAS NMR spectra with increased milling time, indicating that average local electronic structure around Li nuclei was modified during MA. H-1 MAS NMR was used to dynamically probe ammonia release from the activated LiNH2 at temperature as low as 50 degrees C. In the case of activated LiH + LiNH2 mixtures, the H-1 MAS NMR results implied that MA enhanced the dehydrogenation reaction of LiNH2 + LiH = Li2NH + H-2. (c) 2007 Elsevier B.V All rights reserved
URI
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DOI
10.1016/j.jpowsour.2007.02.080
ISSN
0378-7753
Appears in Collections:
ECHE_Journal Papers
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