... purification catalyst4. Similar Products: lanthanum oxide, Cerium oxide, Praseodymium oxide, Neodymium oxide, Promethium oxide, Samarium oxide, Europium oxide, Gadolinium oxide, Terbium ... oxide, Ytterbium oxide, Lutetium oxide, Scandium oxide, Yttrium oxide, Praseodymium-Neodymium Oxide