陈化体系组成对Ce0.65Zr0.35O2储氧材料性能的影响

doi:10.3866/PKU.WHXB201302262

Abstract

Abstract:

Ce_0.65Zr_0.35O₂(CZ)mixed oxides were prepared by coprecipitation. The influence of ethanol on the performance of CZ and Pd based three-way catalysts was investigated. Samples were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen sorption, oxygen storage capacity (OSC), and hydrogen temperature-programmed reduction (H₂-TPR) techniques. The precipitation aging method had an appreciable impact on oxide structure and catalyst performance. Samples aged in ethanol-water system exhibited wide pore-size distributions, large pore volumes and high redox properties, OSC and thermal stabilities. After calcination at 1000 ° C, the specific surface area and OSC of the samples were 29.3 m²·g^-1 and 520 μmol·g^-1, respectively. The excellent structural and textural properties resulted in a high catalytic activity, wide air-to-fuel operating range, and low light-off and full-conversion temperatures to C₃H₈, CO, and NO of the corresponding three-way catalyst.

Key words: Ethanol-water system, Ce_0.65Zr_0.35O₂ oxygen storage material, Structure, Performance

MSC2000:

O643

HANG Li-Hua, CHEN Shan-Hu, ZHANG Qiu-Li, GONG Mao-Chu, CHEN Yao-Qiang. Influence of Composition of Ageing System on Performance of Ce_0.65Zr_0.35O₂ Oxygen Storage Materials[J].Acta Phys. -Chim. Sin., 2013, 29(05): 1097-1106.

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Influence of Composition of Ageing System on Performance of Ce_0.65Zr_0.35O₂ Oxygen Storage Materials

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