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Specifications
| Appearance | Pale yellow powder |
| CeO₂/TREO | 99.99% min |
| TREO | 99% min |
| La₂O₃ | 0.001% max |
| Y₂O₃ | 0.001% max |
| Pr₆O₁₁ | 0.0005% max |
| Nd₂O₃ | 0.001% max |
| Sm₂O₃ | 0.001% max |
| Fe₂O₃ | 0.0015% max |
| SiO₂ | 0.003% max |
| CaO | 0.0035% max |
Applications
1. Catalysts and Catalytic Supports
Automotive Catalytic Converters:
Acts as an oxygen storage/release component in three-way catalytic converters (TWCs) to reduce NOₓ, CO, and hydrocarbons in vehicle exhaust.
Industrial Catalysis:
Used in hydrocarbon cracking, hydrogenation, and water-gas shift reactions due to its oxygen buffering ability.
Fuel Cells:
Serves as an electrolyte material or catalyst support in solid oxide fuel cells (SOFCs).
2. Polishing Agent
Widely used as an ultra-fine abrasive for:
Glass polishing (especially for optical lenses and LCDs)
Semiconductor wafers
Ceramic surfaces
3. UV Absorber in Cosmetics and Coatings
Incorporated into sunscreens, cosmetic formulations, and UV-protective coatings due to its UV-absorbing and non-toxic nature.
4. Additive in Ceramics and Glass
Improves the thermal stability, mechanical strength, and color control in advanced ceramics and colored glass.
5. Biomedical Applications
Investigated for use in antioxidant therapy, radioprotection, and drug delivery, due to its ability to scavenge reactive oxygen species (ROS) via reversible redox cycling (Ce³⁺/Ce⁴⁺).
6. Environmental Applications
Used in waste gas treatment, photocatalysis, and pollution control (e.g., degrading organic pollutants under UV light).
Benefits
✅ High Oxygen Storage and Release Capacity
Cerium dioxide's ability to switch between Ce³⁺ and Ce⁴⁺ allows it to act as a buffer for oxygen, critical in emission control and catalysis.
✅ Thermal and Chemical Stability
Withstands high temperatures and corrosive environments, ideal for high-temperature fuel cells, catalytic systems, and abrasive applications.
✅ Non-toxic and Biocompatible
Considered safe for cosmetic and some biomedical uses, unlike many other metal oxides.
✅ Eco-Friendly
Plays a significant role in reducing vehicular emissions, and is used in environmental remediation via photocatalysis.
Conclusion
Cerium dioxide (CeO₂, CAS 1306-38-3) is a versatile and highly functional rare-earth compound widely used across industries - from automotive emission control, precision polishing, and green energy systems, to cosmetics and advanced catalysis. Its unique redox properties, chemical robustness, and environmental compatibility make it indispensable in modern technology and sustainable innovation.
