Tin oxide exhaust catalyst supports and catalysts stable at high temperatures

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A tin-oxide based three-way catalytic material employing precious metals that is stable at exhaust gas temperatures of internal combustion engines when the tin oxide lattice includes any of several rare earth oxide stabilizers in the lanthanide series. The rare-earth elements are the 15 lanthanide elements with atomic numbers 57 through 71 that are in Group IIIA of the Periodic Table : lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. Such tin-oxide based catalytic materials may also beneficially include zirconium oxide and/or yttrium oxide. The invention is useful in providing three-way catalytic exhaust converters for internal combustion engines.