Perovskite-type catalyst consists essentially of a metal oxide composition is provided. The metal oxide composition is represented by the general formula A.sub.a-x B.sub.x MO.sub.b, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0.ltoreq.x<0.5. Methods of making and using the perovskite-type catalysts are also provided. The perovskite-type catalyst may be used to make a catalytic converter. Methods of making a catalytic converter are also provided.

el Perovskite-tipo catalizador consiste esencialmente en una composición del óxido de metal se proporciona. La composición del óxido de metal es representada por el fórmula general A.sub.a-x B.sub.x MO.sub.b, en el cual A es una mezcla de elementos originalmente en la forma de lanthanides mezclados la monofásico recogidos de bastnasite; B es un catión bivalente o monovalente; M es por lo menos un elemento seleccionado de los elementos que consisten en del grupo de un número atómico de a partir el 23 a 30, 40 a 51, y 73 a 80; a es 1 o 2; b es 3 cuando a es 1 o b es 4 cuando a es 2; y x es un número definido por 0.ltoreq.x