Surface and Texture Properties of Tb-Doped Ceria-Zirconia Solid Solution Prepared by Sol-Gel Method
来源期刊：JOURNAL OF RARE EARTHS2007年第1期
论文作者：Feng Changgen Zhang Zhao Fan Guodong
Key words：Ce0.6Zr0.4-xTbxO2-y solid solution; three-way catalysts; sol-gel method; surface and texture structure; rare earths;
Abstract: The three-way catalysts (TWCs) promoters Ce0.6Zr0.4-xTbxO2-y were prepared by sol-gel method. BET surface areas analysis indicated that an increase of the dopant Tb content from x=0.05 to x=0.15 favors an increase of surface area from 66.8 to 80.4 m2·g-1 compared with the undoped sample Ce0.60Zr0.40O2 65.1 m2·g-1 after calcination at 650 ℃. Transmission electron microscopy (TEM) observation indicated that the doped samples have a higher thermal stability. The XRD and Raman spectra confirmed that the Ce0.6Zr0.4-xTbxO2-y cubic solid solution is formed. XPS analysis revealed that Ce and Tb mainly existed in the form of Ce4+ and Tb3+, and Zr existed in the form of Zr4+ on the surface of the samples. The doped samples were homogenous in composition;the introduction of Tb into the CeO2-ZrO2 promoters resulted in the formation of a solid solution, and the concentration of surface lattice oxygen was increased.
Feng Changgen1，Zhang Zhao2，Fan Guodong2
(1.State Key Laboratory of Prevention and Control of Explosion Disasters, Beijing Institute of Technology, Beijing 100081, China;
2.Institute of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xianyang 712081, China)
Abstract:The three-way catalysts (TWCs) promoters Ce0.6Zr0.4-xTbxO2-y were prepared by sol-gel method. BET surface areas analysis indicated that an increase of the dopant Tb content from x=0.05 to x=0.15 favors an increase of surface area from 66.8 to 80.4 m2·g-1 compared with the undoped sample Ce0.60Zr0.40O2 65.1 m2·g-1 after calcination at 650 ℃. Transmission electron microscopy (TEM) observation indicated that the doped samples have a higher thermal stability. The XRD and Raman spectra confirmed that the Ce0.6Zr0.4-xTbxO2-y cubic solid solution is formed. XPS analysis revealed that Ce and Tb mainly existed in the form of Ce4+ and Tb3+, and Zr existed in the form of Zr4+ on the surface of the samples. The doped samples were homogenous in composition;the introduction of Tb into the CeO2-ZrO2 promoters resulted in the formation of a solid solution, and the concentration of surface lattice oxygen was increased.
Key words:Ce0.6Zr0.4-xTbxO2-y solid solution; three-way catalysts; sol-gel method; surface and texture structure; rare earths;
【全文内容正在添加中】
