COMPOSITION BASED ON OXIDES OF ZIRCONIUM, CERIUM AND AT LEAST ANOTHER RARE-EARTH METAL WITH SPECIFIC POROSITY, METHOD FOR PRODUCTION AND USE IN CATALYSIS

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to a catalyst composition and methods (versions) of producing the catalyst composition for treating exhaust gases of internal combustion engines based on zirconium oxide, cerium oxide and yttrium oxide or based on zirconium oxide, cerium oxide and at least two oxides of rare-earth metals which are not cerium, with weight content of zirconium oxide of at least 20% and cerium oxide of not more than 70%. After calcination at 900°C for 4 hours, the composition contains two pore populations, the corresponding diameter of the first of which ranges from 20 to 40 nm and the second from 80 to 200 nm.;EFFECT: obtaining a catalyst composition with a defined optimum porosity.;18 cl, 3 tbl, 1 dwg, 15 ex