Method for purifying an oxygen-rich exhaust gas
AssigneeTosoh Corporation
InventorsAkinori Eshita, Senshi Kasahara
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Abstract
A catalyst, for purifying an exhaust gas, is a zeolite catalyst for removing nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing the nitrogen oxides, carbon monoxide and hydrocarbons, wherein the zeolite has an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 10 or more and contains nickel, or wherein the zeolite has an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 15 or more, and contains nickel and a rare earth metal or an alkaline earth metal.
Claims14
A method of reducing nitrogen oxides by hydrocarbons from an oxygen-rich combustion exhaust gas, comprising bringing an exhaust gas containing the nitrogen oxides, hydrocarbons and oxygen, into contact with a catalyst comprising a nickel- and rare earth metal-ion-exchanged zeolite, said zeolite having an SIO.sub.2 /Al.sub.2 O.sub.3 molar ratio of at least 15.
A method of reducing nitrogen oxides by hydrocarbons from an oxygen-rich combustion exhaust gas, comprising bringing an exhaust gas containing the nitrogen oxides, hydrocarbons and oxygen, into contact with a catalyst comprising a nickel- and alkaline earth metal-ion-exchanged zeolite, said zeolite having an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of at least 15.
Dependencies are inferred from the claim text.