What Are the Applications of Cerium Oxide?
Posted by Cathie Montanez on August 22, 2019 7:10 AM EDT
At present, CeO2 has been used in glass, ceramics, luminescent materials, automobile exhaust purification, and cerium production, etc.
Cerium oxide (CeO2) is an important light rare earth product. Due to its special properties, cerium oxide is increasingly used in industrial sectors with a rapid increase in the amount and broad prospects. At present, CeO2 has been used in glass, ceramics, luminescent materials, automobile exhaust purification, and cerium production, etc.
Applications in luminescent materials
Rare earth tri-color phosphor is the luminescent material for the production of energy-saving lamps. It is composed of blue powder (10%), green powder (30%) and red powder (60%), among which the red powder is made of yttrium oxide (Y2O3) and CeO2. 99.99% cerium oxide is added as an additive, and this phosphor has the characteristics of high luminous efficiency, good color display, and long life. In addition, CeO2 was added as an activator to the fluorescent powder used in the cathode ray tube, indicator light, and ray detector at the flying point.
Applications in the purification of automobile exhaust
Cars burning oil will emit a large amount of harmful exhaust gas, which contains carbon monoxide (CO), nitrogen oxides (NOX) and hydrocarbons (HC), which are serious hazards to the atmosphere. At present, there are ternary noble metals (Pt, Rh, Pd) catalysts, palladium rare-earth catalysts, and rare earth catalysts to purify these poisons. CeO2 should be added to all three catalysts to improve the dosage of the catalyst by 1-10%. The application shows that the activity of the catalyst can be increased and the purification rate of poison can be improved after the addition of CeO2. In addition, it can improve the resistance to the toxicity of the catalyst and increase the strength of the catalyst by 15% ~ 25%.
Applications in ceramics
After adding CeO2 into Pb (Zr, Ti) O3 ceramics, the internal components of ceramics can be adjusted and changed to improve sintering, dielectric and piezoelectric properties of ceramics and meet different practical requirements. When CeO2 is added into PZT ceramics, the bulk resistivity of PZT ceramics can be improved, and the potential piezoelectric properties can be brought into play. The addition of CeO2 in ceramic coloring pigment can make the pigment have the advantages of bright color, stable, high-temperature performance and uniform color.
Applications in the glass industry
1. Advanced cerium polishing powder
The high cerium polishing powder made by CeO2≥99% has good properties, such as high hardness, fine particle size, and even surface center cubic crystal with water caltrop, which is used for high-speed polishing of glass. Compared with traditional iron polishing powder (iron red Fe2O3), it can increase the polishing rate by 3-4 times.
2.Decolorizer for glass
The ordinary glass contains iron ions (Fe2+) that make the glass appear green. Cerium oxide has strong deoxidization ability and has strong oxidation effect on iron, after adding CeO2 to glass (containing 0.1%CeO2), the "green" iron (Fe) in the glass is oxidized to "colorless" iron (Fe3+), and the quality of the glass is improved, which is called decolorizer. This decolorization technique is very important in glass manufacturing.
3. Radiation-shielding glass
In the glass industry, CeO2 is an excellent additive material with good development prospects. The addition of some kind of oxide to the glass can absorb a large number of slow neutrons radiation protection properties, among which the addition of CeO2 is a better one. For example, the transmittance of visible light decreases less in radiation-resistant glass exposed to gamma rays. Generally, the glass with ceo20.1-1.6 can prevent the radiation of 105-107 gamma rays. The anti-radiation glass with this property can be used as the observation hole material and optical instrument in atomic energy facilities. In addition, CeO2 can also be used in the glass as a clarifying agent and can be used to produce welding goggles glass, sunglasses glass, photochromic glass, and stained glass.
Stanford Advanced Materials supplies high-quality cerium oxide to meet our customers' R&D and production needs. Please visit https://www.samaterials.com/ for more information.