Nitrogen oxide removing material

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PROBLEM TO BE SOLVED : To obtain a nitrogen oxide removing material having broad window on a catalyst-activating temp. and high durability. SOLUTION : At least two kinds of noble metal catalyst micro particles are dispersed and adhered on a surface of a brown millerlite type multiple oxide particles expressed by A3 B4 O9 , A2 B2 O5 or AB2 O4 . The brown millerlite type multiple oxide contains at least two kinds of metals among following rear earth element, alkaline earth metal elements or metal element group Ce, Nd, Eu, Gd, Tb, Dy, Ho, Er, Ca, Sr, Ba, Ti, Zn, Y, Zr, In and Hf. Averaged particle size of the noble metal particles is <=25 nm.