COMPOSITION BASED ON OXIDES OF ZIRCONIUM, CERIUM, LANTHANUM AND YTTRIUM, GADOLINIUM OR SAMARIUM WITH HIGH SPECIFIC SURFACE AND REDUCING ABILITY, METHOD OF ITS PRODUCTION AND APPLICATION AS CATALYST Russian patent published in 2010 - IPC B01J23/10 B01J21/06 B01J35/10 B01J37/03 B01J37/08 B01J37/12 B01D53/94 

FIELD: chemistry.

SUBSTANCE: invention relates to composition based on oxides of zirconium, cerium, lanthanum and yttrium, gadolinium or samarium with high specific surface and reducing ability, method of its production and application as catalyst for exhaust gas cleaning. Proposed composition consists mainly of oxides of zirconium, cerium, lanthanum and one rare earth metal selected from yttrium, gadolinium or samarium with content of cerium oxide of 20 to 50 wt %, content of lanthanum oxide and oxide the other rare earth metal of 15 to 35 wt %. In case lanthanum oxide content is less than 2 wt %, the composition features specific surfaces of at least 45 m²/g, at least 15 m²/g and at least 7 m²/g, after roasting for 4 h at 1000°C, 10 h at 1150°C and 10 h at 1200°C. Invention covers also the composition consisting of above described oxides and their specific surfaces after roasting at 1000°C and 1150°C. Note here that said composition after roasting at 1150°C exists as pure solid solution and features specific surface after roasting for 10 h at 1200°C of at least 5 m²/g. Invention covers also methods of producing the compositions, catalytic system of exhaust gas purification, method of exhaust gas purification using catalyst of above described composition or catalytic system.

EFFECT: higher stability of specific surface and reducibility.

16 cl, 7 tbl, 11 ex, 2 dwg