CATALYST FOR PURIFYING NITROGEN OXIDE

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The nitrogen-oxide-removing catalyst of the invention includes β zeolite bearing a rare earth metal oxide, and titanium dioxide bearing a rare earth metal oxide; includes β-zeolite bearing a rare earth metal oxide and iron oxide or iron hydroxide, and titanium dioxide bearing a rare earth metal oxide and iron oxide or iron hydroxide; or includes a carrier made of a ceramic or metallic material, and a layer of the nitrogen-oxide-removing catalyst supported on the carrier.