Cerium (III) oxide is a rare earth metal oxide of cerium . The chemical formula is Ce 2 O 3 , color is golden yellow.
| Cerium oxide | |
|---|---|
 | |
| General | |
| Systematic name | Cerium oxide |
| Chem. formula | Ce 2 O 3 |
| Physical properties | |
| Molar mass | 328.24 g / mol |
| Density | 6.2 g / cm³ |
| Thermal properties | |
| T. melt. | 2177 ° C |
| Structure | |
| Coordination geometry | P-3m1, No. 164 |
| Crystal structure | hexagonal |
| Classification | |
| Reg. CAS number | [1345-13-7] |
| PubChem | |
| Reg. EINECS number | |
| Smiles | |
| Inchi | |
| ChemSpider | |
Content
Application
Exhaust catalyst
Cerium oxide is used as a catalytic converter to reduce CO emissions in motor vehicle exhaust.
When there is not enough oxygen, cerium (IV) oxide is reduced by carbon monoxide (II) to cerium (III) oxide:
- 4CeO 2 + 2CO → 2Ce 2 O 3 + 2CO 2
If there is an excess of oxygen, cerium (III) oxide, on the contrary, is oxidized to cerium (IV) oxide:
- 2Ce 2 O 3 + O 2 → 4CeO 2
Water splitting
The CeO 2 cycle - Ce 2 O 3 is a two-step thermochemical breakdown of water .
Lighting
Cerium (III) oxide in combination with tin (II) oxide (SnO) in ceramic form is used for illumination with UV radiation . It absorbs light with a wavelength of 320 nm and emits light with a wavelength of 412 nm. Such a combination of cerium (III) oxide and tin (II) oxide is rare, and is obtained with great difficulty in laboratory conditions.
Getting
Cerium (III) oxide is obtained by reduction of cerium (IV) oxide with hydrogen at about 1400 ° C. .