COMPLEX OXIDE, METHOD OF OBTAINING THEREOF AND CATALYST FOR PURIFICATION OF WASTE GASES

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FIELD : chemistry. SUBSTANCE : invention relates to complex oxides and methods of obtaining thereof. Claimed is complex oxide, containing cerium and, at least, one of rare-earth elements-metals, excluding cerium and including yttrium, in weight ratio from 85 : 15 to 99 : 1 counted per oxides, and which additionally contains silicon in amount from more than 0 wt.p. to not more than 20 wt.p., counted per SiO2 relative to 100 wt.p. of the total weight of cerium and, at least, one of rare-earth elements-metals, excluding cerium and including yttrium, where complex oxide has specific surface not smaller than 40 m2/g when measured by BET method after burning at 900°C for 5 hours, and reduction ability not less than 30% when calculated by results of reduction measurement at programmed temperature from 50°C to 900°C, after burning at 1000°C for 5 hours. Also claimed are methods of obtaining complex oxide and catalyst for purification of waste gases with application of complex oxide. EFFECT : claimed complex oxide is capable of preserving large specific surface even when used under high temperature conditions and possesses excellent thermal stability and reduction ability. 9 cl, 1 tbl, 18 ex