摘要
采用共沉淀法制备了CeO2,Ce0.6Zr0.4O2和Ce0.6Zr0.3Co0.1Ox载体材料,采用沉积沉淀法制备了Pd/CeO2,Pd/Ce0.6Zr0.4O2和Pd/Ce0.6Zr0.3Co0.1O2-x催化剂。采用X射线衍射、氮气吸脱附、透射电子显微镜和氢气程序升温还原技术对三种催化剂的物化性质进行了表征,研究了其三效催化性质和热稳定性。结果表明:沉积沉淀法能制备出较小粒径且均匀分散的钯催化剂。掺杂钴元素(Co)可以改善载体及催化剂的氧化还原性能,提高催化剂的三效催化活性,并拓宽催化剂的三效工作窗口。Pd/Ce0.6Zr0.3Co0.1O2-x在水热老化后表现出良好的催化活性和优异的氧化还原性能。
CeO2,Ce0. 6Zr0. 4O2 and Ce0. 6Zr0. 3Co0. 1Oxsupports were prepared by coprecipitation method. Pd /CeO2,Pd /Ce0. 6Zr0. 4O2 and Pd /Ce0. 6Zr0. 3Co0. 1O2-xcatalysts were fabricated by deposition-precipitation method. The physiochemical properties of the catalysts were characterized by X-ray diffraction（ XRD）,N2adsorption-desorption,transmission electron microscopy（ TEM） and H2-TPR techniques. Three-way catalytic activities and thermal stabilities of the catalysts were investigated. The results revealed that deposition-precipitation method could prepare catalysts with small and well dispersed palladium particles. The redox performance and three-way catalytic activities of the catalyst could be enhanced by doping of cobalt（ Co）. And three-way operation window of the catalyst could also be broadened by doping of cobalt（ Co）. After being hydrothermal aged,the Pd /Ce0. 6Zr0. 3Co0. 1O2-xcatalyst showed better catalytic activities and excellent redox properties.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2014年第4期410-419,共10页
Journal of the Chinese Society of Rare Earths
基金
北京市自然科学基金面项目(2142006)资助
关键词
钯三效催化剂
氧化铈
铈基复合氧化物
沉积沉淀法
palladium three-way catalysts
ceria
ceria-based complex oxide
deposition-precipitation method
