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Hydrothermal Preparation and Oxygen Storage Capacity of Nano CeO2-based Materials
Li-li Liu1, Mei Zhang*1, Min Guo1, Xi-dong Wang2
1.Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China;2.College of Engineering, Peking University, Beijing 100871, China
Abstract:
"catalysts were synthesized by hydrothermal method. The X-ray diffraction result showed that the averageparticle size was in the range of 11-12 nm, which was correspondence to the high-resolution transmission electron microscopy result that the average particle size was about 12 nm. The specific surface area of the NiO-CeO2 binary compounds was in the range of 54-75 m2/g. Also the average particle size of the Bi2O3-CeO2 binary compounds was in the range of 8-11 nm. The oxygen storage capacity of the NiO-CeO2 and Bi2O3-CeO2 binary compounds was investigated under reduction and oxidation conditions. When the Ni and Bi concentration in CeO2 was up to 30%, the OSC values reached 2465 and 2560 1molO/g separately, which indicated that NiO and Bi2O3 compounded CeO2 materials have fine catalysis activity than other cations doped CeO2-based materials and appear to be very promising for practical applications such as OSC materials"
Key words:  Hydrothermal, Oxygen storage capacity, NiO-CeO2, Bi2O3-CeO2
FundProject:
铈基纳米材料水热合成及储放氧性能
刘丽丽1, 张梅*1, 郭敏1, 王习东2
1.北京科技大学理化系,北京100083;2.北京大学工学院,北京100871
摘要:
" 采用水热方法合成汽车尾气三效催化剂助剂材料NiO-CeO2和Bi2O3-CeO2二元纳米化合物.首先,对NiO-CeO2二元材料进行X射线分析,结果显示颗粒平均尺寸在11~12 nm,这一结果与高分辨电镜结果观察的颗粒尺寸相吻合,同在12 nm左右.同时,对NiO-CeO2二元化合物进行BET比表面积分析,结果显示:水热合成材料的比表面积在54~75 m2/g.另外,对Bi2O3-CeO2二元化合物进行X射线分析,结果显示合成材料的晶粒尺寸在8~11 nm.最后,我们分别对两种材料进行了氧化还原条件下
关键词:  水热法,储放氧性能,NiO-CeO2,Bi2O3-CeO2
DOI:10.1088/1674-0068/20/06/711-716
分类号: