ZIRCONIUM OXIDE- AND CERIUM OXIDE BASED COMPOSITION WITH INCREASED REDUCING POWER AND STABLE SPECIFIC SURFACE, METHOD OF ITS PRODUCING AND USING FOR EXHAUST GAS TREATMENT Russian patent published in 2010 - IPC B01D53/94 C01G25/02 B01J23/10 B01J37/03 

FIELD: process engineering.

SUBSTANCE: invention can be used for exhaust gas after burning in ICE. Aqueous mix containing zirconium and cesium and one of lanthanides, ether than cerium, and yttrium is obtained. Obtained mix is heated to 100 °C to produce precipitate in the form of suspension in reaction medium which is brought up to the level of alkaline pH. First, added is additive selected from anion surfactants, nonionic surfactants, polyethylene glycols, carbonic acids and their salts, and surfactants of the type of carboxymethylated oxethylates of fat alcohols is added to produced medium and, then precipitate is separated. In compliance with another version, first, precipitate is liberated from reaction medium and, thereafter, aforesaid additive is added to precipitate. Precipitate is calcinated in atmosphere of inert gas or in vacuum at 900 °C and, then in oxidising atmosphere at 600 °C. Produced composition contains cerium oxide in amount of not over 50 wt %. Reduction degree after calcination in atmosphere of air at 600 °C makes at least 95 %, while specific surface after calcination at 1100 °C for 4 h makes at least 15 m²/g.

EFFECT: possibility to produce catalytic systems that feature efficiency in exhaust gas treatment.

18 cl, 2 tbl, 6 ex