Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Kinetic measurement and prediction of the hydrogen outgassing from the polycrystalline LiH/Li2O/LiOH system

Journal Article · · Journal of Nuclear Materials
; ; ; ; ; ; ; ;
Due to the exothermic reaction of lithium hydride (LiH) salt with water during transportation and handling, there is always a thin film of lithium hydroxide (LiOH) present on the LiH surface. In dry or vacuum storage, this thin LiOH film slowly decomposes. We have used temperature-programmed reaction/decomposition (TPR) in combination with the isoconversion method of thermal analysis to determine the outgassing kinetics of H{sub 2}O from pure LiOH and H{sub 2} and H{sub 2}O from this thin LiOH film. H{sub 2} production via the reaction of LiH with LiOH, forming a lithium oxide (Li{sub 2}O) interlayer, is thermodynamically favored, with the rate of further reaction limited by diffusion through the Li{sub 2}O and the stability of the decomposing LiOH. Lithium hydroxide at the LiOH/vacuum interface also decomposes easily to Li{sub 2}O, releasing H{sub 2}O which subsequently reacts with LiH in a closed system to form H{sub 2}. At the onset of dry decomposition, where H{sub 2} is the predominant product, the activation energy for outgassing from a thin LiOH film is lower than that for bulk LiOH. However, as the reactions at the LiH/Li{sub 2}O/LiOH and at the LiOH/vacuum interfaces proceed, the overall activation energy barrier for the outgassing approaches that of bulk LiOH decomposition. The kinetics developed here predicts a hydrogen evolution profile in good agreement with hydrogen release observed during long term isothermal storage.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
877777
Report Number(s):
UCRL-JRNL-211246
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 347; ISSN 0022-3115; ISSN JNUMAM
Country of Publication:
United States
Language:
English

References (11)

Equilibrium pressures of H2O(g) over the Li2O(s)-LiOH(s) system journal December 1993
Die bestimmung kinetischer parameter endothermer zersetzungsreaktionen unter nicht-isothermen bedingungen journal December 1975
Isoconversion method for kinetic analysis of solid-state reactions from dynamic thermoanalytical data journal January 1999
Kinetics of the reaction of water vapour with crystalline lithium hydride journal January 1966
The reaction kinetics of lithium salt with water vapor journal June 2002
Composition of corrosion films on lithium hydride surfaces after exposure to air report March 1974
The effects of moisture on LiD single crystals studied by temperature-programmed decomposition journal June 2001
Ion‐backscattering study of LiOH‐to‐Li 2 O conversion on a LiH substrate journal October 1974
Kinetics in Solids journal October 1997
The nature and effects of the thermal stability of lithium hydroxide journal May 2003
Kinetics of dissociation of hydrated cerium(III) sulfate, nitrate and oxalate in air journal November 1985

Similar Records

Kinetic measurement and prediction of the hydrogen outgassing from the polycrystalline LiH/LiOH system
Conference · Tue Mar 08 23:00:00 EST 2005 · OSTI ID:15015944
Kinetic and Prediction of Hydrogen Outgassing from Lithium Hydride
Conference · Thu Aug 31 00:00:00 EDT 2006 · OSTI ID:896007
Outgassing in the LiD/LiOH System
Conference · Fri Oct 17 00:00:00 EDT 2003 · OSTI ID:15013651

Related Subjects

08 HYDROGEN
36 MATERIALS SCIENCE
ACTIVATION ENERGY
DEGASSING
DIFFUSION
FORECASTING
HYDROGEN
KINETICS
LITHIUM HYDRIDES
LITHIUM HYDROXIDES
LITHIUM OXIDES
PRODUCTION
STABILITY
STORAGE
THERMAL ANALYSIS
THIN FILMS
WATER