CATALYST SYSTEM FOR REMOVING NITROGEN OXIDE AND METHOD FOR REMOVING NITROGEN OXIDE

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Disclosed is a catalyst system comprising a first reaction unit which is loaded with a first catalyst containing, as active constituents, a composite oxide composed of two or more oxides selected from silica, alumina, titania, zirconia and tungsten oxide, and a rare earth metal or a transition metal (excluding Cu, Co, Ni, Mn, Cr and V), and a second reaction unit which is loaded with a second catalyst containing, as active constituents, a noble metal and a silica-alumina composite oxide.