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Citation: FENG Chang-Gen, FAN Guo-Dong, LIU Xia. Studies on Ceria-zirconia Solid Solution Promoters Modified with Tb[J]. Chinese Journal of Applied Chemistry, ;2005, 22(7): 703-708. shu

Studies on Ceria-zirconia Solid Solution Promoters Modified with Tb

1.
a State Key Laboratory of Prevention and Control of Explosion Disasters, Beijing Institute of Technology, Beijing 100081;
2.
b College of Science, China Agricultural University, Beijing

Corresponding author: FENG Chang-Gen,
Received Date: 20 October 2004
Available Online: 13 January 2005
Fund Project: 国家高技术研究发展计划("八六三"计划)资助项目(2002AA643010) ("八六三"计划)资助项目(2002AA643010)

The promoters Ce_0.6Zr_0.4-xTb_xO_2-y of three-way catalysts (TWCs) were prepared by coprecipitation and sol-gel methods.The XRD and Raman spectra confirm that the Ce_0.6Zr_0.4-xTb_xO_2-y cubic solid solution is formed,and the XPS analysis indicates that the valences of Ce and Tb are maily in the forms of Ce⁴⁺ and Tb³⁺ on the surface of samples.The particle size distribution and TEM show that the solid solution particles are in the form of agglomerate in the liquid.The catalytic performance was also measured for the fully formulated Pt,Rh and Pd TWCs (high ratio of Pd) containing this kind of promoters.The results indicate that the introduction of Tb ions into CeO₂-ZrO₂ solid solution lowers the ligh-off temperature of fresh TWCs.Among TWCs containing the promoters which prepared via coprecipitation method,the sample containing 15% Tb exhibits the lowest ligh-off temperature,that is,18℃,21℃ and 27℃ for CO,C₃H₆ and NO_x conversion,while for those containing the promoters prepared by sol-gel method,the ligh-off temperature does not depend on Tb content,the sol-gel method is better than the coprecipitation method.For the aged samples which have been calcined at 900℃ for 2 h,the optimum Tb content is 5%.
- Ce_0.6Zr_0.4-xTb_xO_2-y solid solution,
- three-way catalysts,
- oxygen storage material,
- coprecipitation,
- sol-gel method
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