For abatement of NOx during lean exhaust conditons, a variety of catalysts has been investigated. Supports were modified by co-impregnation method and Mn, Pd were selected as major active species. For the characterization of catalysts, XRD, XPS, EDX and TPD technique were used. A reaction was performed ranging from 100 to 500 ℃ and reactant gas were simulated. As a results, activity had relations with NO desorption characteristics of catalysts and phase transition were affected by mole ratio. Though a series of Pd catalysts showed better cativity than Mn ones, most of catalysts had low conversion within lower temperatures.