NITROGEN OXIDE PURIFYING CATALYST AND EXHAUST GAS PURIFICATION CATALYST CARRIER

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PROBLEM TO BE SOLVED : To provide a nitrogen oxide purifying catalyst and an exhaust gas purification catalyst carrier capable of sufficiently purifying NOcontaining an exhaust gas even in the coexistence of COunder a high-temperature environment.SOLUTION : There are provided a nitrogen oxide purifying catalyst for purifying NOfrom en exhaust gas containing at least NOand COexhausted from an internal combustion engine, and an exhaust gas purification catalyst carrier constituted by supporting the same on a honeycomb structure. The nitrogen oxide purifying catalyst does not substantially contain alkali metal elements and alkaline earth metal elements, and mainly comprises complex-oxides in which rare earth elements other than Y are solid-dissolved into YO.