Thermal Treatment of Chromium(III) Oxide with Carbonates Analyzed by Far-Infrared Spectroscopy
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Stemann, Jan
Holldack, Karsten
Sekine, Ryo
Lipiec, Ewelina
Adam, Christian
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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 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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Applied Spectroscopy
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69
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10
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© 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.
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Subject
Analytical chemistry
Analytical chemistry not elsewhere classified
Physical chemistry
Mechanical engineering
Far-infrared spectroscopy
Far-IR spectroscopy
Chromium
Carbonate
Chromate
Thermal treatment