METHOD OF PREPARING CATALYST FOR TREATING INTERNAL COMBUSTION ENGINE EXHAUST GASES AND CATALYST OBTAINED BY THIS METHOD Russian patent published in 2008 - IPC B01J37/25 B01J23/63 B01J21/00 B01J21/02 B01J37/16 B01D53/94 

FIELD: gas treatment catalysts.

SUBSTANCE: invention relates to a method for preparing catalyst and to catalyst supported by block ceramic and metallic carrier having honeycomb structure for treating internal combustion engine exhaust gases. Preparation of catalyst comprises preliminary calcination of inert honeycomb block carrier followed by simultaneously depositing at 550-800°C, on its surface, intermediate coating of modified alumina and active phase consisting of one or several platinum group metals from water-alcohol suspension including aluminum hydroxide (boehmite, AlOOH), cerium nitrate, and one or several inorganic salts of platinum group metals. Coated material is then dried and subjected to heat treatment and reduction. According to invention, aforesaid suspension contains boehmite and cerium nitrate at 1:2 ratio and further contains reducing disaccharide so that suspension has following composition, wt %: AlOOH 18-20, Ce(NO₃)₃·6H₂O 36-40, one or several platinum group metal salts (e.g., H₂PtCl₆, PdCl₃, or RhCl₃ calculated as metals) 1.5-1.8, reducing disaccharide 5-6, and water/alcohol (between 5:1 and 10:1) the rest. Thus obtained catalyst for treating internal combustion engine exhaust gases is characterized by: specific surface area of coating 80-100 m²/g, Al₂O₃ content 2.5-6.5%, CeO₂ content 2.5-6.5%, active phase (calculated for platinum group metals) 0.2-0.4%, and block carrier to 100%.

EFFECT: simplified technology due to reduced number of technological stages and shortened process time, and enabled preparation of high-activity catalyst.

6 cl, 1 tbl, 8 ex