• Source: Cerium(III) oxide

Cerium(III) oxide, also known as cerium oxide, cerium trioxide, cerium sesquioxide, cerous oxide or dicerium trioxide, is an oxide of the rare-earth metal cerium. It has chemical formula Ce2O3 and is gold-yellow in color.




Applications






= Engine and exhaust catalysts

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Cerium oxide is used as a catalytic converter for the minimisation of CO emissions in the exhaust gases from motor vehicles.
When there is a shortage of oxygen, cerium(IV) oxide is reduced by carbon monoxide to cerium(III) oxide:

2 CeO2 + CO → Ce2O3 + CO2
When there is an oxygen surplus, the process is reversed and cerium(III) oxide is oxidized to cerium(IV) oxide:

2 Ce2O3 + O2 → 4 CeO2
Major automotive applications for cerium(III) oxide are as a catalytic converter for the oxidation of CO and NOx emissions in the exhaust gases from motor vehicles, and secondly, cerium oxide finds use as a fuel additive to diesel fuels, which results in increased fuel efficiency and decreased hydrocarbon derived particulate matter emissions, however the health effects of the cerium oxide bearing engine exhaust is a point of study and dispute.




= Water splitting

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The cerium(IV) oxide–cerium(III) oxide cycle or CeO2/Ce2O3 cycle is a two step thermochemical water splitting process based on cerium(IV) oxide and cerium(III) oxide for hydrogen production.




= Photoluminescence

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Cerium(III) oxide combined with tin(II) oxide (SnO) in ceramic form is used for illumination with UV light. It absorbs light with a wavelength of 320 nm and emits light with a wavelength of 412 nm. This combination of cerium(III) oxide and tin(II) oxide is rare, and obtained only with difficulty on a laboratory scale.




Production


Cerium(III) oxide is produced by the reduction of cerium(IV) oxide with hydrogen at approximately 1,400 °C (2,550 °F). Samples produced in this way are only slowly air-oxidized back to the dioxide at room temperature.




References






External links


Transformation of CeO2(1 1 1) to Ce2O3(0 0 0 1) films

Kata Kunci Pencarian:

• Serium
• Serium(IV) oksida
• Unsur golongan 3
• Kromium
• Kamus rumus kimia
• Hipoklorit
• Galium
• Praseodimium
• Hidrogen
• Fluorin
• Cerium(III) oxide
• Cerium(IV) oxide
• Cerium oxide
• Cerium(III) chloride
• Cerium
• Ceria based thermochemical cycles
• Cerium compounds
• Praseodymium(III) oxide
• Zirconium dioxide
• List of inorganic compounds