Gas-phase hydroxyl radical emission in the thermal decomposition of lithium hydroxide

Suguru Noda, Masateru Nishioka, Masayoshi Sadakata

Research output: Contribution to journalArticle

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Abstract

The gas-phase hydroxyl (OH) radical emission was observed in the thermal decomposition of lithium hydroxide (LiOH). This phenomenon was investigated in a vacuum flow tube reactor at around 2 Torr by the temperature programmed reaction (TPR) experiments at 500-1300 K. The production of OH and other gaseous products was quantitatively investigated by the laser induced fluorescence method and quadrupole mass spectrometry, respectively. The TPR spectra of OH had a peak at 1100-1200 K, which largely exceeded the gas-phase thermodynamic equilibrium. The origin of OH was supposed to be either the surface OH groups on Li2O or the residual LiOH in the LiOH/Li2O solid solution. OH production exceeding the thermodynamic equilibrium was explained by means of the partial equilibrium in the reaction: LiOH + 1/4O2 ⇔ 1/2Li2O + OH. This phenomenon can be a new route for the OH production from H2O and O2 in cyclic reactions of lithium compounds.

Original languageEnglish
Pages (from-to)1954-1959
Number of pages6
JournalJournal of Physical Chemistry B
Volume103
Issue number11
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

lithium hydroxides
hydroxyl radicals
Hydroxyl Radical
thermal decomposition
Lithium
Pyrolysis
Gases
vapor phases
Lithium Compounds
thermodynamic equilibrium
Lithium compounds
Thermodynamics
lithium compounds
Pipe flow
Mass spectrometry
Solid solutions
Fluorescence
Vacuum
laser induced fluorescence
Temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Gas-phase hydroxyl radical emission in the thermal decomposition of lithium hydroxide. / Noda, Suguru; Nishioka, Masateru; Sadakata, Masayoshi.

In: Journal of Physical Chemistry B, Vol. 103, No. 11, 1999, p. 1954-1959.

Research output: Contribution to journalArticle

Noda, Suguru ; Nishioka, Masateru ; Sadakata, Masayoshi. / Gas-phase hydroxyl radical emission in the thermal decomposition of lithium hydroxide. In: Journal of Physical Chemistry B. 1999 ; Vol. 103, No. 11. pp. 1954-1959.
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