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The rising awareness of environmental protection on a global level is leading to more stringent automobile emissions regulations. In addition, there are calls to reduce the use of precious metals as catalysts due to concerns about resource depletion. Recently, the number of hybrid vehicles and vehicles featuring idling engine stop functionality is increasing as fuel-efficient vehicles rapidly becoming the norm for all models. In these vehicles the amount of NOx emissions increases when the engine restarts after an idling stop and it is difficult to reduce the use of precious metals in the catalyst. Consequently, it is necessary to develop a catalytic technology that can make effective use of the Rh component because this is essential to NOx conversion. In this study, an examination was conducted using the following two approaches for the purpose of reducing the amount of transient NOx.