FIELD: chemistry.
SUBSTANCE: invention relates to NOx retaining materials. Described is a nitrogen oxide retaining catalyst, having: a substrate; a first porous oxide coating layer on the substrate, where said first porous oxide coating layer contains a nitrogen oxide retaining material which contains substrate particles of cerium oxide coated with barium carbonate; and a second porous oxide coating layer over the first porous oxide coating layer containing one platinum group metal, wherein the second porous oxide coating layer essentially does not contain platinum, cerium and barium, and said one platinum group metal is rhodium deposited on particles of a refractory metal oxide, which contain aluminium oxide doped with zirconium oxide in amount of up to 30%. Described is a method of producing said retaining material and use thereof.
EFFECT: high activity.
12 cl, 5 dwg, 5 ex
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