PRODUCTS AND SYSTEMS FOR SELECTIVE CATALYTIC REDUCTION Russian patent published in 2021 - IPC B01J29/72 B01J37/02 B01J29/76 F01N3/20 

FIELD: exhaust gas processing.

SUBSTANCE: invention relates to a product for selective catalytic reduction containing substrate having a front end located higher along the flow and a rear end located lower along the flow, determining the length of the axis of substrate, and having catalytic coating on it, where catalytic coating contains: the first coating layer containing the first copper-containing molecular sieve; and the second different coating layer containing the second copper-containing molecular sieve; where the first copper-containing molecular sieve contains copper oxide in the amount from 0.1 wt. % to 3 wt. % based on the total weight of the molecular sieve, the second copper-containing molecular sieve contains copper oxide in the amount based on the total weight of the molecular sieve, and the amount of copper oxide contained in the first copper-containing molecular sieve is less than the amount of copper oxide in the second copper-containing molecular sieve; where the first copper-containing molecular sieve and the second copper-containing molecular sieve, each, are fine-pored molecular sieves with 8-element rings; and where the product for selective catalytic reduction provides the conversion of NOx, more than or equal to 92%, and the formation of N₂O, less than or equal to 2%, when tested under cyclic conditions in accordance with Heavy Duty Diesel US Federal Test Procedure. The invention also relates to a system for processing exhaust gas and a method for processing it.

EFFECT: minimizing the formation of undesirable N₂O.

20 cl, 4 dwg, 1 ex