... , namely, La (lanthanum), Ce (cerium), Pr (praseodymium), Nd (neodymium), Pm (promethium), Sm (samarium), Eu (europium), Gd (gadolinium), ... and electric light industry. With the research of rare-earth developing, rare-earth is gradually applied in high and new technology ... material, fine ceramic and catalyst..The application of rare-earth in automotive exhaust gasWith the growth of automotive quantity ...