Ce

Cerium (Ce) is a rare-earth lanthanide metal with a silvery appearance and moderate strength, available in high-purity forms for specialized applications. It is primarily used in catalytic converters for automotive emissions control, glass polishing compounds, and as an alloying addition to improve oxidation resistance and high-temperature strength in nickel and iron-based superalloys. Engineers select cerium for its ability to enhance material performance in chemically or thermally demanding environments, though its cost and limited availability compared to common metals typically restrict its use to applications where its specific benefits—such as catalytic activity or grain refinement—are critical.