| abstract |
FIELD: chemistry. n SUBSTANCE: invention relates to catalytic purification of exhaust gases of internal combustion engines. Claimed is composition for purification of exhaust gases of internal combustion engines based on cerium oxide, containing niobium oxide, with the following weight contents: niobium oxide from 2 to 20%, the remaining part - cerium oxide. Also claimed is composition with the following weight contents: cerium oxide at least 65%, niobium oxide from 2 to 12%, zirconium oxide to 48%. After calcinations for 4 hours at 800°C compositions have acidity at least 6·10 -2 , with said acidity being expressed in ml of ammonia per m 2 of composition, with the surface, expressed in m 2 , used for determination of acidity, representing specific surface after calcinations for 4 hours at 800°C and specific surface at least 15 m 2 /g, and after calcinations for 4 hours at 1000°C it has specific surface at least 2 m 2 /g, in particular at least 3 m 2 /g. Invention relates to catalyst, which contains said compositions, to methods of oxidising CO and hydrocarbons, N 2 O, decomposition, for HO x and CO 2 adsorption. Said compositions and catalyst are applied in reaction of gas with water, reaction of conversion with water steam, isomeration reaction, reaction of catalytic cracking and as triple action catalyst. n EFFECT: compositions possess satisfactory reducing ability in combination with good acidity, specific surface of which remains suitable for application in catalysis. n 16 cl, 1 tbl, 14 ex |