Overview
Cerium (Ce) is a lanthanide series rare earth metal with atomic number 58. It was discovered in 1803 by Jöns Jakob Berzelius and Wilhelm Hisinger and is the most abundant rare earth element, constituting about 0.0046% of the Earth's crust. Cerium exhibits variable oxidation states (+3 and +4), making it versatile in industrial applications. Its name derives from the dwarf planet Ceres, discovered two years earlier. Commercially, cerium is extracted from minerals like monazite and bastnäsite through complex separation processes. It is critical in modern technology due to its catalytic and optical properties.
Physical and Chemical Properties
Cerium is a soft, malleable metal with a silvery-white luster. It tarnishes rapidly in air, forming a passivating oxide layer. The metal has a face-centered cubic structure at room temperature and transitions to other crystal forms under pressure or temperature changes. Chemically, cerium reacts with water (especially when finely divided) to produce hydrogen gas. It dissolves in acids, forming trivalent cerium salts. Its +4 oxidation state is stable in aqueous solutions, a rarity among lanthanides. This redox behavior underpins its use in catalytic applications.
Main Applications
Cerium's primary use is in catalytic converters for automobiles, where ceria (CeO₂) helps oxidize carbon monoxide and hydrocarbons. It is also essential in glass polishing powders due to its abrasive properties, accounting for ~50% of global consumption. In metallurgy, cerium improves aluminum alloys' heat resistance and magnesium alloys' strength. Other applications include phosphors for LEDs, UV-blocking glass, and self-cleaning oven coatings. Emerging uses involve energy storage (fuel cells) and wastewater treatment catalysts.
Safety and Storage
Cerium metal poses fire risks when powdered, igniting spontaneously in air. Bulk storage requires inert atmospheres or mineral oil immersion to prevent oxidation. Workers should use PPE (gloves, goggles) to avoid skin/eye contact with particles or solutions. Waste disposal must comply with hazardous material regulations, especially for cerium compounds. Spills should be contained using dry sand or vermiculite, never water, due to hydrogen gas generation. Facilities require Class D fire extinguishers for cerium fires.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and traceable material sourcing. Key specifications include purity (99.9% for catalytic uses), particle size (for powders), and oxide content. Long-term contracts are advisable due to price volatility linked to rare earth market dynamics. Logistics require moisture-proof packaging for metal forms and UN-certified containers for hazardous derivatives. Regional stockpiling is recommended to mitigate supply chain disruptions, particularly given China's dominance in rare earth production.
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