SO₂ Resisting Pd-doped Pr_1-x Ce_x MnO₃ Perovskites for Efficient Denitration at Low Temperature

H₂ -SCR is served as the promising technology for the controlling of NO_x emission, and the Pd-based derivative catalyst exhibited high NO_x reduction performance. Effectively regulating the electronic configuration of the active component is favorable to the rational optimization of noble Pd. In this work, a series of Pr_1-x Ce_x Mn_1-y Pd_y O₃ @Ni were successfully synthesized and exhibited superior NO conversion efficiency at low temperatures. 92.7 % conversion efficiency was achieved at 200 °C over Pr_0.9 Ce_0.1 Mn_0.9 Pd_0.1 O₃ @Ni in the presence of 4 % O₂ with a GHSV of 32000 h^-1 . Meanwhile, the outstanding performance was obtained in the resistance to SO₂ (200 ppm) and H₂ O (8 %). Deduced from the results of XRD, Raman, XPS, and H₂ -TPR, the modification of d orbit states in palladium was confirmed originating from the incorporation in the B site of Pr_0.9 Ce_0.1 Mn_0.9 Pd_0.1 O₃ . The existence of higher valence (Pd³⁺ and Pd⁴⁺ ) than the bivalence in Pr_0.9 Ce_0.1 Mn_0.9 Pd_0.1 O₃ catalyst was evidenced by XPS analysis. Our research provides a new sight into the H₂ -SCR through the higher utilization of Pd.