Infrared spectra of N-H compounds in LiCl-KCl-CsCl molten salts using the diffuse reflectance optical system

Nobuyuki Serizawa, Katsuhito Takei, Tokujiro Nishikiori, Yasushi Katayama, Yasuhiko Ito

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2 Citations (Scopus)

Abstract

The in-situ Fourier transform infrared spectroscopy of molten eutectic LiCl-KCl-CsCl was conducted in order to identify the dissolved ions in the molten salt electrolytes. The transflectance spectrum of the melts could be easily obtained at temperatures higher than 350°C using the commercially available diffuse reflectance optical system and an air-tight chamber with a built-in heater. The sharp absorption peak attributable to the stretching vibration of OH- was observed in the melt containing LiOH, indicating the availability of identification of dissolved species in the melts. The intensities of transflection possibly assignable to N-H bonds in imide (NH2-) and amide (NH2 -) anions in the melt containing Li3N changed during supplying H2 gas because of the progress of the protonation reactions of these anions to form NH3. The in-situ analysis of the dissolved ions in the melts under the reaction conditions by infrared spectroscopy with the diffuse reflectance optical system can be a simple and powerful tool for understanding the reaction mechanism.

Original languageEnglish
Pages (from-to)88-91
Number of pages4
JournalElectrochemistry
Volume86
Issue number2
DOIs
Publication statusPublished - 2018 Jan 1

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Keywords

  • Amide and imide anions
  • Diffuse reflectance
  • Electrochemical ammonia synthesis
  • Infrared spectroscopy

ASJC Scopus subject areas

  • Electrochemistry

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