Showing papers on "Chromium(III) oxide published in 1986"
TL;DR: In this article, a detailed study of the oxidative dissolution of chromium(III) oxide (Cr2O3) in potassium permanganate is reported, and the kinetics of the reaction follow an inverse-cubic rate law under both acid and alkaline conditions; no inhibition by MnO2 product is observed.
Abstract: A detailed study of the oxidative dissolution of chromium(III) oxide (Cr2O3) in potassium permanganate is reported. The kinetics of the reaction follow an inverse-cubic rate law under both acid and alkaline conditions; no inhibition by MnO2 product is observed. In alkaline solution, in the temperature range 43–140 °C, the rate exhibits dependences on permanganate and hydroxide concentrations which are explained in terms of a Langmuirian adsorption mechanism. The rate of dissolution is controlled by electron transfer within a surface complex in which both OH– and MnO–4 are bound. Thermodynamic parameters imply chemical bond formation between permanganate and ions in the oxide surface. A study in dilute HNO3 shows that adsorption of MnO–4 is also a prerequisite for reaction under acid conditions.
32 citations
TL;DR: In this paper, the interaction of oxygen with the epitaxially grown Cr2O3(0001) oxide surface has been examined using LEED, TDS, XPS and Δφ measurements.
30 citations
Patent•
18 Oct 1986TL;DR: In this article, a process for the preparation of chromium (III) oxide by decomposing hydrated ammonium dichromate at elevated temperature of a device for carrying out this method was described.
Abstract: The invention relates to a process for the preparation of chromium (III) oxide by decomposing hydrated ammonium dichromate at elevated temperature of a device for carrying out this method and to the use of the thus prepared chromium (III) oxide as a starting material for the synthesis of chromium dioxide.
1 citations
TL;DR: Etudes de la chimisorption et de la coadsorption de sodium, chlore and oxygene sur Cr(100) and sur des surfaces de Cr 2 O 3 (0001), formees par croissance epitaxiale as discussed by the authors
Abstract: Etudes de la chimisorption et de la coadsorption de sodium, chlore et oxygene sur Cr(100) et sur des surfaces de Cr 2 O 3 (0001), formees par croissance epitaxiale
1 citations
Patent•
17 Oct 1986
TL;DR: In this paper, a process for the preparation of chromium(III) oxide by decomposing hydrated ammonium dichromate at elevated temperatures is described, and an apparatus for carrying out this process and the use of the chromium oxide thus prepared as a starting material for the synthesis of Chromium dioxide is described.
Abstract: A process for the preparation of chromium(III) oxide by decomposing hydrated ammonium dichromate at elevated temperatures, an apparatus for carrying out this process and the use of the chromium(III) oxide thus prepared as a starting material for the synthesis of chromium dioxide.