Effect of Zirconium Precursor on Performance of Pd/Ce0.45Zr0.45La0.1O1.95 Three-Way Catalyst

doi:10.1016/S1872-2067(11)60445-2

Abstract

Abstract: Three types of Ce_0.45Zr_0.45La_0.1O_1.95 mixed oxides were prepared by H₂O₂-assisted precipitation using ZrOCO₃, ZrO(NO₃)₂, and Zr(NO₃)₄ as precursors. The Pd/Ce_0.45Zr_0.45La_0.1O_1.95 three-way catalysts were prepared by the wet impregnation and characterized by the X-ray diffraction (XRD), Raman spectroscopy, nitrogen adsorption, X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), and oxygen storage capacity. XRD and Raman spectroscopy results showed that the use of ZrOCO₃ or ZrO(NO₃)₂ gave a CeO₂-ZrO₂ mixed oxide with a cubic phase of high thermal stability, while an extra t″-phase was observed in the aged Pd/Ce_0.45Zr_0.45La_0.1O_1.95catalyst prepared using Zr(NO₃)₄. The activities of the three catalysts were evaluated using simulated exhaust gas under working conditions. The Pd/Ce_0.45Zr_0.45La_0.1O_1.95catalyst prepared using ZrOCO₃ as precursor gave the best activities for C₃H₈, CO, and NO conversion. The use of ZrOCO₃ as precursor was better suited for the formation of Ce³⁺ and more favorable for the homogeneous insertion of Zr⁴⁺ and La³⁺ into the CeO₂ lattice, which resulted in better thermal stability and enhanced redox properties of the Pd/Ce_0.45Zr_0.45La_0.1O_1.95catalyst.

Key words: oxygen storage material, oxidation-coprecipitation, thermal stability, redox property, three-way activity

CHEN Shan-Hu, YAO Yan-Ling, LAN Li, CAO Yi, YAN Chao-Yang, GONG Mao-Chu, CHEN Yao-Qiang. Effect of Zirconium Precursor on Performance of Pd/Ce_0.45Zr_0.45La_0.1O_1.95 Three-Way Catalyst[J]. Chinese Journal of Catalysis, 2012, 33(11): 1762-1771.

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Effect of Zirconium Precursor on Performance of Pd/Ce_0.45Zr_0.45La_0.1O_1.95 Three-Way Catalyst

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