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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TL;DR: In this article, it was shown that the activity of catalysts prepared by mechanical mixing of aluminum oxide and the products from thermal decomposition of a carboxylate complex of chromium at 300-700 °C depends non-monotonically on the size of the chromium oxide crystallites in the range of 10-50 nm.
Abstract: It was established that the activity of catalysts prepared by mechanical mixing of aluminum oxide and the products from thermal decomposition of a carboxylate complex of chromium at 300-700 °C depends non-monotonically on the size of chromium oxide crystallites in the range of 10-50 nm. It was shown that the highest activity is achieved on catalysts in which the size of the chromium oxide crystallites is 23 nm.
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TL;DR: In this article, the effect of chromium oxide on the electric properties of a solid-oxide fuel cell electrolyte was studied and it was found that the chromium reduction at the electrolyte surface dominates when chromium is adsorbed from gas phase.
Abstract: To study the effect of chromium oxide on the electric properties of Ce0.9Gd0.1O2, a solid-oxide fuel cell electrolyte, two approaches were used: (a) the studying of electrochemical properties of the Ce0.9Gd0.1O2- electrolyte after the spontaneous adsorption of chromium-containing molecules from a gas phase and (b) the analyzing of transport properties of the Ce0.9Gd0.1O2-based chromium-containing compositions obtained by the mixing of solid-oxide electrolyte with chromium(III) oxide. It was found that the chromium reduction at the electrolyte surface dominates when chromium is adsorbed from gas phase. Both approaches allow concluding that the chromium presence in Ce0.9Gd0.1O2 deteriorates the electrolyte transport properties at temperatures above 735°С. This is caused by the chromium incorporation into the electrolyte’s fluorite structure, as well as surface microheterogeneity induced by the chromium presence at the Ce0.9Gd0.1O2 surface and the cerium and gadolinium cation redistribution between the grains’ bulk and surface. At intermediate temperatures (below 735°С) the electric conductivity of the Ce0.9Gd0.1O2-based chromium-containing composition exceeds that of the initial solid-oxide electrolyte, which can be due to changes in transport properties of the chromium-containing phases formed at the Ce0.9Gd0.1O2 surface and grain boundaries.
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TL;DR: Chromium(III) oxide reverses the sequence of dehydration of barium perchlorate trihydrate (BP) and gives the yellow barium dichromite BaCr2O4 as discussed by the authors.
Abstract: Chromium(III) oxide reverses the sequence of dehydration of barium perchlorate trihydrate (BP). Between 223 and 310‡ the oxide reacts with anhydrous BP in a 1∶1 molar ratio to give the yellow barium dichromite BaCr2O4. Between 350 and 430‡ this material reacts in 1∶1 stoichiometry with BP, to give barium chromate BaCrO4. The products have been identified by X-ray diffraction analysis. The formation of an unkown phase is also reported.
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TL;DR: In this paper, a screen of likely binding groups showed that polyphosphonates were the most promising in terms of binding stability, and a better understanding of the binding mechanisms and adhesive tenacity of the trial polymers onto stainless steel was used.
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