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M-Co/RPSA (M=La, Ce, Pr, Nd) catalysts for N2O decomposition was prepared by impregnation method. XRD, H2-TPR and TG-DSC-MS are employed to characterize the catalysts. The XRD result showed that Co species exist in the form of Co3O4. H2-TPR result showed that Nd-Co/RPSA had the strongest reducing ability. The activity evaluation results indicated that the Nd-Co/RPSA catalyst exhibited the highest catalytic activity, and T95 is 453.8°C.