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李红梅,兰丽,刘达玉,王卫,薛慧玲,漆文胜,龚茂初,陈耀强.CeO2基储氧材料的制备和表征[J].稀有金属材料与工程(英文),2020,49(3):769~777.[Li Hong-Mei,Lan Li,Liu Da-Yu,Wang Wei,Xue Hui-Ling,Qi Wen-Sheng,Gong Mao-Chu and Chen Yao-Qiang.Preparation and characterization of CeO2-based oxygen storage materials[J].Rare Metal Materials and Engineering,2020,49(3):769~777.]
Preparation and characterization of CeO2-based oxygen storage materials
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Received:March 14, 2017  Revised:July 26, 2018
DOI:
Key words: Oxygen storage material (OSM)  Thermal stability  Co-precipitation  Oxygen storage capacity (OSC)  Ce atom utilization ratio
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Li Hong-Mei,Lan Li,Liu Da-Yu,Wang Wei,Xue Hui-Ling,Qi Wen-Sheng,Gong Mao-Chu and Chen Yao-Qiang  
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Abstract:
      Four types of CeO2-based oxide samples were prepared by co-precipitation, and their physicochemical properties were characterized by X-ray diffraction (XRD), Raman spectroscopy, N2 adsorption-desorption (Brunauer-Emmet-Teller method; BET), H2-temperature-programmed reduction (H2-TPR), oxygen pulsing technique, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). XRD profiles revealed that only broad diffraction lines characteristic of CeO2 were observed in the case of CeO2 and CeO2-Al2O3 (CA), while CeO2-ZrO2 (CZ) and CeO2-ZrO2-Al2O3 (CZA) disclosed Ce0.75Zr0.25O2 phase. The paper revealed that homogeneous solid solutions were formed for all the CeO2-based oxygen storage materials. XPS studies showed that 4+ and 3+ oxidation states of cerium were coexisted on the surface of CZ, CA and CZA However, almost no 3+ oxidation state was detected for pure CeO2. The best textural properties, higher oxygen storage capacity (OSC) and excellent thermal stability were obtained for CZA. In addition to compare the differences among the four samples, this article proposed a new insight that Al3+ might insert among the inter-space of the fluorite structure or highly dispersed in the solid solution. CZA solid solution might be composed of interstitial solid solution and substitutional solid solution, which was verified by the presence of two oxygen species or two types of oxygen channels for CA and CZA. However, the evidence was not detailed enough to sustain this argument, so that further investigation was necessary.