COMPOSITE OXIDE, METHOD FOR PRODUCING SAME AND CATALYST FOR EXHAUST GAS PURIFICATION

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FIELD : chemistry. SUBSTANCE : invention relates to a composite oxide, which can be used for catalysts, functional ceramics, solid electrolytes for fuel elements, abrasive and similar, in particular, to catalysts for cleaning automobile exhaust gas, as well as to a method of producing composite oxide. Oxide contains 50–98 wt% of cerium oxide and one of rare-earth metal elements, other than cerium and including yttrium, zirconium and aluminium, at a ratio of 85 : 15 to 100 : 0 by weight, 1–30 wt% alkali-earth metal oxides and 1–20 wt% silicon oxide. EFFECT : invention provides easy production of composite oxide, having excellent heat resistance, specific surface area of which is retained even when oxide is used in a medium with high temperature, and after calcination at 800 °C for 2 hours which does not deteriorate performance of a cocatalyst. 10 cl, 1 tbl, 12 ex