Catalytic composition and method for removing nitrogen oxides

Abstract

A catalytic composition, including a carrier, a first active component, and a second active component. The first active component is covered on a surface of the carrier. The first active component includes a first catalyst, and the first catalyst is a manganese oxide. The second active component includes a second catalyst and a third catalyst, and is covered on a surface of the first active component and the surface of the carrier that is uncovered with the first active component. The second catalyst includes a platinum metal, a palladium metal, or a combination thereof. The third catalyst includes a potassium oxide, a sodium oxide, or a combination thereof. A molar ratio of the first catalyst to the second catalyst is from 1:0.001 to 1:0.2, and a molar ratio of the first catalyst to the third catalyst is from 1:0.1 to 1:10.

Dependencies are inferred from the claim text.