METHOD OF PREPARING CATALYST FOR PURIFICATION OF EXHAUST GASES OF COMBUSTION ENGINES AND CATALYST OBTAINED THEREOF Russian patent published in 2013 - IPC B01J37/25 B01J23/63 B01J37/08 B01J37/16 B01J35/04 B01D53/94 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of obtaining block catalysts, catalysts of purification of exhaust gases (EG) of combustion engines (CE). Described is method of preparing catalyst for CE EG purification, in which for application of intermediate coating and active phase used is water suspension, which includes aluminium hydroxide - boehmite (AlOOH), reducing disaccharide and soluble salts of Ce, Zr, Y, La in form of nitric acid salts in proportion required for formation in coating of tetragonal phase Zr_0.5Ce_0,5O₂, stable in temperature range 500-1000°C and ratio in coating (Me₂O₃+ZrO₂+CeO₂):γ-Al₂O₃-1:1, where - Me - Y, La, as well as one or several inorganic salts of platinum group metals, with thermal processing of coating being carried out simultaneously with reduction at temperature 550-1000°C. Obtained is catalyst for purification of exhaust gases of combustion engine with composition in wt %: Al₂O₃ - 6,0-7,0, (Me₂O₃+ZrO₂+CeO₂), where - Me - Y, La, - 6.0-7.0, including content of Me₂O₃, where - Me - Y, La,- 0.35-0.5 wt %. Active phase, in terms of platinum group metals is 0.07-0.08 wt %. Block carrier constitutes the remaining part to 100 wt %. Specific surface of coating after TP: 500°C - 100-120 m²/g, 800°C - 80-100 m²/g, 1000°C - 60-70 m²/g, 1200°C - 5-10 m²/g.

EFFECT: simplification of technology due to reduction of number of technological stages, time of their realisation, obtaining highly active and thermally stable catalyst.

5 cl, 1 tbl, 4 dwg, 4 ex