| abstract |
FIELD: chemistry. n SUBSTANCE: claimed invention relates to method of obtaining SCR-active zeolite catalyst and to catalyst, obtained thereof. Described is method of obtaining said catalyst, characterised by the fact that Fe-ion-exchange zeolite is first subjected to exposure to reducing hydrocarbon atmosphere for first thermal processing (3) in the range from 300 to 600°C, which reduces degree of oxidation of Fe ions and/or increases dispersion of Fe ions in zeolite, after that, reduced zeolite is subjected to exposure of oxidising atmosphere for second thermal processing (4) in the range from 300 to 600°C, which removes hydrocarbon residues and/or carbon residues in oxidation manner, and zeolite is burnt (2) in the course of first and second thermal processing (3 and 4) with obtaining catalyst. Described is SCR-active catalyst with burnt catalytic composition, which includes Fe-ion exchange zeolite, where Fe ions are present mainly with oxidation degree less than +3 and/or with high dispersion in zeolite, characterised by the fact that conversion of Fe ions into ions with higher degree of oxidation +3 and/or reduction of their dispersion is blocked. n EFFECT: increased catalytic activity with respect to selective reduction of nitrogen oxides in low-temperature range lower than 300°C. n 19 cl, 2 dwg, 3 ex |