SCR CATALYST Russian patent published in 2022 - IPC B01J37/02 B01J37/08 B01J37/06 B01J29/76 B01D53/56 B01D53/34 B01D53/94 B01D53/86 B01J35/04 C01B39/04 C01B39/06 C01B39/48 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to a method for synthesis of zeolite for NO_x reduction and/or NH₃ oxidation, having a CHA framework structure. Catalyst composition contains a synthetic zeolite having a CHA framework structure and a molar ratio of silicon dioxide to aluminum oxide (SAR) of 45 to 85, and an atomic ratio of copper to aluminum of at least 1.25. Method includes: forming a reaction mixture containing a silicon dioxide source, an aluminum oxide source, a first organic template reagent for CHA in the form of a copper metal-amine complex (Cu-TEPA), a second organic template reagent for CHA (DMECHA) and seed crystals; heating the reaction mixture to facilitate crystallisation and precipitation of crystals of the catalyst composition; and collecting, washing and drying crystals. Reaction mixture is free from fluorine.

EFFECT: technical result is obtaining zeolites as a catalyst, which is less susceptible to high-temperature hydrothermal degradation, thereby reducing loss of activity.

3 cl