Study on hydrothermal preparation and oxygen storage capacity of nano CeO2-based materials
Nano-powders of NiO-CeO2 and Bi2O3-CeO2 binary compounds for a promoter in the automotive three-way catalysts (TWCs) were synthesized by hydrothermal method. The X-ray diffraction result showed that the average particle 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-1. Also the average particle size of the Bi2O3-CeO2 binary compounds was in the range of 8-11 nm. The oxygen storage capacity (OSC) 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 30mol％, the OSC values reached 2465 and 2560 μmol O/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.
Hydrothermal Oxygen storage capacity NiO-CeO2 Bi2O3-CeO2
刘丽丽 张梅 郭敏 王习东
北京科技大学理化系,北京100083,中国 北京大学工学院,北京100871,中国
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）