Topic
Chromium(III) oxide
About: Chromium(III) oxide is a research topic. Over the lifetime, 163 publications have been published within this topic receiving 2526 citations. The topic is also known as: green oxide of chromium & green chromium oxide.
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4 citations
TL;DR: The reduction exceeding a certain amount of surface oxygen species on α-Cr2O3 by CO causes a change in surface structure, with the conversion of more active to less active sites, which is visualized by measuring the distribution of the oxidation power of the surface oxygen as discussed by the authors.
Abstract: The reduction exceeding a certain amount of surface oxygen species on α-Cr2O3 by CO causes a change in surface structure, with the conversion of more active to less active sites, which is visualized by measuring the distribution of the oxidation power of the surface oxygen species.
4 citations
TL;DR: In this article, it was shown that the activity of catalysts based on Cr 2 O 3 in deep oxidation of methane is determined by both the sizes of the crystallites and their morphology.
Abstract: We have shown that the activity of catalysts based on Cr 2 O 3 in deep oxidation of methane is determined by both the sizes of the crystallites and their morphology. In the temperature range up to 450 °C, we observe the appearance of a size effect: an increase in the specific catalytic activity of the chromium oxide as its particle size decreases. Formation of chromium oxide on the surface of Al 2 O 3 increases the dispersity of the active component and increases the thermal stability of the catalyst.
4 citations
TL;DR: In this paper, the reaction mechanism of the electrocatalytic oxidation of NO at the modified electrode was studied using cyclic voltammetry and differential pulse voltammetric.
Abstract: Chromium (III) oxide was used as a bulk mediator in carbon paste electrodes to improve the better performance of the carbon electrodes for the detection of nitric oxide in comparison with unmodified electrodes. The reaction mechanism of the electrocatalytic oxidation of NO at the modified electrode was studied using cyclic voltammetry and differential pulse voltammetry. The chemical sensor could be operated under physiological conditions (pH 7.5, 0.1 M phosphate buffer), with an operating potential of 750 mV (vs. Ag/AgCl), in hydrodynamic amperometry. The amperometric response of the sensor showed good linearity up to 200 mmol/L with a detection limit (3 σ ) of 0.69 mmol/L. The effect of the interferent nitrite was not fatal and could be eliminated by the use of the standard addition method. The new chemical sensor seems also promising to detect NO in car exhaust fumes.
4 citations
TL;DR: It was found that polyethylene powder with a low particle size is favorable for the collection of good far-IR spectra of inorganic powders, which prevents the formation of Cr(VI)/Cr(V) compounds.
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.
4 citations