A Completely Inorganic BZ-Type Oscillator in a Closed Homogeneous System

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Abstract

In a batch reactor, an absolutely homogeneous inorganic Belousov–Zhabotinskii (BZ)-type oscillator has been designed in the system of BrO<sub>3</sub><sup>−</sup>–H<sub>2</sub>PO<sub>2</sub><sup>−</sup>–Mn<sup>2+</sup>–Fe(phen)<sub>3</sub><sup>2+</sup>–H<sub>2</sub>SO<sub>4</sub>. The oscillations of both [Br<sup>−</sup>] and [Mn<sup>3+</sup>]/[Mn<sup>2+</sup>] as well as [Fe(phen)<sub>3</sub><sup>3+</sup>]/[Fe(phen)<sub>3</sub><sup>2+</sup>] were observed by monitoring the changes of either the potential on a bromide electrode or the absorbance at the maximum absorbance wavelength for Mn<sup>3+</sup> and Fe(phen)<sub>3</sub><sup>3+</sup>, respectively. Both of those two metallic ions are essential in the present system to give rise to the oscillations; their roles in the oscillation are discussed. It is found that Mn<sup>2+</sup> can not be replaced by other substances, while Fe(phen)<sub>3</sub><sup>2+</sup> can be replaced by either N<sub>2</sub> flow or acetone. However, it can not be replaced by other metallic ions, including Mn<sup>2+</sup> and Ce<sup>3+</sup>. Those results suggest that Mn<sup>2+</sup> is the real oscillating catalyst for an autocatalytic formation of HBrO<sub>2</sub> and Fe(phen)<sub>3</sub><sup>2+</sup> is a catalyst for the catalytic reduction of Br<sub>2</sub> by H<sub>2</sub>PO<sub>2</sub><sup>−</sup> to remove any excess Br<sub>2</sub> produced during the oscillations.

Journal

  • Bulletin of the Chemical Society of Japan

    Bulletin of the Chemical Society of Japan 70(7), 1539-1543, 1997-07-15

    The Chemical Society of Japan

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Codes

  • NII Article ID (NAID)
    10008920341
  • NII NACSIS-CAT ID (NCID)
    AA00580132
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00092673
  • NDL Article ID
    4260290
  • NDL Source Classification
    ZP1(科学技術--化学・化学工業)
  • NDL Call No.
    Z53-B35
  • Data Source
    CJP  NDL  J-STAGE 
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