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  • Thermal Treatment of Chromium(III) Oxide with Carbonates Analyzed by Far-Infrared Spectroscopy

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    Author(s)
    Vogel, Christian
    Stemann, Jan
    Holldack, Karsten
    Sekine, Ryo
    Lipiec, Ewelina
    Adam, Christian
    Griffith University Author(s)
    Sekine, Ryo
    Year published
    2015
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    Abstract
    The chemical state of thermochemically treated chromium(III) oxide (Cr2O3) with various carbonates was analyzed by far-infrared (far-IR) spectroscopy (spectral region 700–25 cm−1). Non-toxic Cr2O3 was oxidized with potassium, sodium, and calcium carbonate, respectively, to toxic Cr(VI) and Cr(V) compounds during thermal treatment at 1000 °C. In reverse, thermochemical treatment of Cr2O3 with magnesium carbonate lead to the formation of the Cr(III) compound MgCr2O4. Higher temperatures (>1200 °C) or reducing atmospheric conditions prevent the formation of Cr(VI)/Cr(V) compounds, too. Additionally, it was found that polyethylene ...
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    The chemical state of thermochemically treated chromium(III) oxide (Cr2O3) with various carbonates was analyzed by far-infrared (far-IR) spectroscopy (spectral region 700–25 cm−1). Non-toxic Cr2O3 was oxidized with potassium, sodium, and calcium carbonate, respectively, to toxic Cr(VI) and Cr(V) compounds during thermal treatment at 1000 °C. In reverse, thermochemical treatment of Cr2O3 with magnesium carbonate lead to the formation of the Cr(III) compound MgCr2O4. Higher temperatures (>1200 °C) or reducing atmospheric conditions prevent the formation of Cr(VI)/Cr(V) compounds, too. Additionally, it was found that polyethylene powder with a low particle size (<70 μm) is favorable for the collection of good far-IR spectra of inorganic powders.
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    Journal Title
    Applied Spectroscopy
    Volume
    69
    Issue
    10
    DOI
    https://doi.org/10.1366/15-07878
    Copyright Statement
    © 2015 Society for Applied Spectroscopy. The attached file is reproduced here in accordance with the copyright policy of the publisher. The final, definitive version of this paper has been published in Applied Spectroscopy, Volume 69, Number 10, 2015 by OSA Publishing.
    Subject
    Analytical chemistry
    Analytical chemistry not elsewhere classified
    Physical chemistry
    Mechanical engineering
    Far-infrared spectroscopy
    Far-IR spectroscopy
    Chromium
    Carbonate
    Chromate
    Thermal treatment
    Publication URI
    http://hdl.handle.net/10072/382252
    Collection
    • Journal articles

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