采用聚合物前驱体法制备了超细Ce-Zr-Ba复合氧化物粉体,用XRD、TEM、BET和TG-DTA技术研究了合成的粉体的组成结构,晶粒大小、比表面和孔分布情况.结果表明,该粉体平均粒径<50nm,经600℃焙烧4h后该粉体的比表面为118.6m2/g,经800℃高温焙烧4h后比表面仍高达87.4m2/g,经1000℃高温处理后,粉体仍能保持纳米级,且分散性好,由于该粉体的高热稳定性和高比表面性能,可用作汽车尾气三效催化剂的耐高温保护性涂层材料.
Ultrafine powder of Ce-Zr-Ba mixed oxide was prepared with a macromolecule surface modified method. The
typical structure, particle size, surface area and pore structure of the powder were investigated by TEM, XRD, BET and TG-DTA technologies. The results
show that the Ce-Zr-Ba mixed oxide powder is nano-sized with the particle size of 50nm, and a high surface area of 119.0m2/g at the calcination of
600℃ for 4h. The surface area of the powder remains 87.4m2/g even calcination at 800℃ for 4h. After calcination at 1000℃ for 4h, it will keep good particle distribution and in nano-sized properties.
This powder can be used as the material in three way catalyst (TWC) for its novel character of resistance high temperature and high surface area.
参考文献
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