FIELD: chemistry.
SUBSTANCE: composition includes a) the first molecular sieve having a pre-aged BEA mesh or a BEA mesh with isomorphic iron, wherein the said first molecular sieve contains 0.5-5 wt % of ion exchange-obtained or free iron; and b) the second molecular sieve having a crystalline structure with small pores and containing 0.5-5 wt % of ion exchange-obtained or free Cu. The ratio of the said first molecular sieve and the said second molecular sieve ranges from 0.1 to 1.
EFFECT: catalyst composition is characterised by a higher degree of conversion of NOx with the equal or lower penetration of NH3 than any molecular sieve component taken separately.
14 cl, 14 dwg, 3 tbl, 8 ex
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