Method for catalytic reduction of nitrogen oxides

Abstract From the Canadian patent

A method which comprises subjecting fuel to combustion while the combustion atmosphere of the fuel is oscillated periodically and alternately between rich and lean conditions leading the exhaust as formed to a catalytic reactor and , bringing the exhaust gas into contact with a catalyst in the catalytic reactor to conduct catalytic reduction of nitrogen oxides contained in the exhaust gas, wherein the catalyst comprises as catalyst components:, (A) an oxide catalyst component A comprising (a) ceria or, (b) praseodymium oxide or (c) a mixture of oxides and/or a composite oxide of at least two elements selected from the group consisting of cerium zirconium, praseodymium, neodymium, …