ZEOLITE PROMOTED V/TI/W CATALYSTS Russian patent published in 2018 - IPC B01J29/46 B01J29/68 B01J37/02 B01D53/94 B01J23/22 B01J23/30 B01J23/40 B01J21/06 

FIELD: chemistry.

SUBSTANCE: present invention relates to catalysts, systems and methods that are suitable for purifying an exhaust gas from the combustion of a hydrocarbon fuel, and in particular an exhaust gas containing nitrogen oxides such as an exhaust gas produced by diesel engines. Described is a catalyst composition for purification of exhaust gas comprising a mixture of a first component and a second component, wherein the first component is an aluminosilicate molecular sieve component, wherein the molecular sieve component has a structure selected from MFI, BEA and FER, and wherein said aluminosilicate molecular sieve component is ionically substituted with iron Fe, and the second component is vanadium oxide supported on titanium dioxide, wherein the catalyst composition comprises from 15 to 25 wt% of the first component and 85 to 75 wt% of the second component based on the total weight of the catalytically active components in the mixture. Disclosed is a porous catalytic coating of the "washcoat" type, comprising said catalyst composition, further comprising one or more fillers, binders, processing additives, water and dopants, and a catalytic article comprising a substrate coated with said catalyst composition or comprising an embedded catalyst composition in which the substrate is selected from a metal flow-through substrate, a ceramic flow-through substrate, a flow-through wall filter, a sintered metal filter, a partial filter, and an extruded honeycomb structure of the catalyst. Exhaust gas purification method of the invention includes the steps of: a) contacting an exhaust gas stream comprising NO_x and / or NH₃, in the presence of a catalyst composition according to item 1; and b) converting at least a portion of said NO_x to N₂ and / or converting at least a portion of NH₃ to at least one substance from N₂ and NO₂.

EFFECT: technical result is improvement of catalytic characteristics of the catalyst, improvement of its high temperature parameters, improvement of hydrothermal stability, increase of resistance to sulphur and improvement of resistance to NO₂.

8 cl, 4 ex, 5 dwg