CATALYST, CATALYST CARRIER, METHODS OF THEIR PRODUCTION(VERSIONS) AND METHOD OF EXHAUST GASES CLEANING FROM NITROGEN OXIDES Russian patent published in 2002 - IPC

FIELD: catalysts, catalyst carriers, methods of their production and methods of cleaning from NO_x, of exhaust gases, including flue gases of thermal power stations, automobile exhaust gases; and production of nitric acid. SUBSTANCE: invention proposes composition of catalyst for cleaning of exhaust gases from nitrogen oxides by catalytic reduction with hydrocarbons in oxidizing atmosphere. Catalyst composition includes, n Me₁ m Me₂O/carrier, where Me₁ is noble metal; Me₂ is oxide of transition metal, with n= 0-2.0, m=0-6.0 provided n and m are not equal to 0 simultaneously. Carrier presents low-temperature cube modification of zirconium dioxide stabilized by oxides of calcium, strontium, barium or their mixture in amount of no less than 1.0 mas.% with specific surface no below of 160 sq.m/g. Noble metal is used in the form of silver, platinum, or their mixture. Oxide of transition metal is used in the form of oxide of copper, cobalt, nickel or their mixture. Methods of catalyst and catalyst carrier production and cleaning of exhaust gases from nitrogen oxides are also described in the invention. EFFECT: efficient removal of nitrogen oxides at low temperature with use of hydrocarbon reducer in the form of C₂-C₁₆. 11 cl, 1 dwg, 3 tbl, 20 ex